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引言",[1530,1531,1532],"p",{},"通过学习这篇文章，你将掌握 JavaScript 中对象和数组的核心操作技巧，理解如何创建、访问、修改以及遍历这些数据结构。不仅如此，还能学会实用的方法来处理日常开发中常见的数据操作问题，帮助你写出更简洁高效的代码，为后续学习更复杂的前端知识打下坚实基础。",[1534,1535],"hr",{},[1525,1537,1539],{"id":1538},"对象的基础操作","📦 对象的基础操作",[1530,1541,1542],{},"JavaScript 中对象是存储各种键值对（key-value）的容器。对象的键一般是字符串，值可以是任意类型。",[1544,1545,1546],"h3",{"id":1546},"创建对象",[1530,1548,1549],{},"创建对象的方法有好几种，最常用的是字面量写法：",[1551,1552,1557],"pre",{"className":1553,"code":1554,"language":1555,"meta":1556,"style":1556},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","var person = {\n    name: '小明',\n    age: 20,\n    city: '北京',\n};\n","js","",[1558,1559,1560,1580,1603,1617,1634],"code",{"__ignoreMap":1556},[1561,1562,1565,1569,1573,1577],"span",{"class":1563,"line":1564},"line",1,[1561,1566,1568],{"class":1567},"s50WR","var",[1561,1570,1572],{"class":1571},"sndM8"," person ",[1561,1574,1576],{"class":1575},"s86vT","=",[1561,1578,1579],{"class":1575}," {\n",[1561,1581,1583,1587,1590,1593,1597,1600],{"class":1563,"line":1582},2,[1561,1584,1586],{"class":1585},"sd2Uz","    name",[1561,1588,1589],{"class":1575},":",[1561,1591,1592],{"class":1575}," '",[1561,1594,1596],{"class":1595},"sIEYB","小明",[1561,1598,1599],{"class":1575},"'",[1561,1601,1602],{"class":1575},",\n",[1561,1604,1606,1609,1611,1615],{"class":1563,"line":1605},3,[1561,1607,1608],{"class":1585},"    age",[1561,1610,1589],{"class":1575},[1561,1612,1614],{"class":1613},"smPcV"," 20",[1561,1616,1602],{"class":1575},[1561,1618,1620,1623,1625,1627,1630,1632],{"class":1563,"line":1619},4,[1561,1621,1622],{"class":1585},"    city",[1561,1624,1589],{"class":1575},[1561,1626,1592],{"class":1575},[1561,1628,1629],{"class":1595},"北京",[1561,1631,1599],{"class":1575},[1561,1633,1602],{"class":1575},[1561,1635,1637],{"class":1563,"line":1636},5,[1561,1638,1639],{"class":1575},"};\n",[1530,1641,1642,1643,1646],{},"也可以使用 ",[1558,1644,1645],{},"new Object()","：",[1551,1648,1650],{"className":1553,"code":1649,"language":1555,"meta":1556,"style":1556},"var person = new Object();\nperson.name = '小明';\nperson.age = 20;\nperson.city = '北京';\n",[1558,1651,1652,1673,1694,1709],{"__ignoreMap":1556},[1561,1653,1654,1656,1658,1660,1663,1667,1670],{"class":1563,"line":1564},[1561,1655,1568],{"class":1567},[1561,1657,1572],{"class":1571},[1561,1659,1576],{"class":1575},[1561,1661,1662],{"class":1575}," new",[1561,1664,1666],{"class":1665},"swgpB"," Object",[1561,1668,1669],{"class":1571},"()",[1561,1671,1672],{"class":1575},";\n",[1561,1674,1675,1678,1681,1684,1686,1688,1690,1692],{"class":1563,"line":1582},[1561,1676,1677],{"class":1571},"person",[1561,1679,1680],{"class":1575},".",[1561,1682,1683],{"class":1571},"name ",[1561,1685,1576],{"class":1575},[1561,1687,1592],{"class":1575},[1561,1689,1596],{"class":1595},[1561,1691,1599],{"class":1575},[1561,1693,1672],{"class":1575},[1561,1695,1696,1698,1700,1703,1705,1707],{"class":1563,"line":1605},[1561,1697,1677],{"class":1571},[1561,1699,1680],{"class":1575},[1561,1701,1702],{"class":1571},"age ",[1561,1704,1576],{"class":1575},[1561,1706,1614],{"class":1613},[1561,1708,1672],{"class":1575},[1561,1710,1711,1713,1715,1718,1720,1722,1724,1726],{"class":1563,"line":1619},[1561,1712,1677],{"class":1571},[1561,1714,1680],{"class":1575},[1561,1716,1717],{"class":1571},"city ",[1561,1719,1576],{"class":1575},[1561,1721,1592],{"class":1575},[1561,1723,1629],{"class":1595},[1561,1725,1599],{"class":1575},[1561,1727,1672],{"class":1575},[1544,1729,1730],{"id":1730},"访问对象属性",[1530,1732,1733],{},"访问对象的属性有两种方式：",[1551,1735,1737],{"className":1553,"code":1736,"language":1555,"meta":1556,"style":1556},"console.log(person.name); // 直接用点语法\nconsole.log(person['age']); // 用中括号语法\n",[1558,1738,1739,1764],{"__ignoreMap":1556},[1561,1740,1741,1744,1746,1749,1752,1754,1757,1760],{"class":1563,"line":1564},[1561,1742,1743],{"class":1571},"console",[1561,1745,1680],{"class":1575},[1561,1747,1748],{"class":1665},"log",[1561,1750,1751],{"class":1571},"(person",[1561,1753,1680],{"class":1575},[1561,1755,1756],{"class":1571},"name)",[1561,1758,1759],{"class":1575},";",[1561,1761,1763],{"class":1762},"syuKq"," // 直接用点语法\n",[1561,1765,1766,1768,1770,1772,1775,1777,1780,1782,1785,1787],{"class":1563,"line":1582},[1561,1767,1743],{"class":1571},[1561,1769,1680],{"class":1575},[1561,1771,1748],{"class":1665},[1561,1773,1774],{"class":1571},"(person[",[1561,1776,1599],{"class":1575},[1561,1778,1779],{"class":1595},"age",[1561,1781,1599],{"class":1575},[1561,1783,1784],{"class":1571},"])",[1561,1786,1759],{"class":1575},[1561,1788,1789],{"class":1762}," // 用中括号语法\n",[1791,1792,1793],"tip",{},[1530,1794,1795],{},"如果属性名是变量，或者属性名中有特殊字符或空格，必须用中括号访问。",[1544,1797,1798],{"id":1798},"修改和添加属性",[1530,1800,1801],{},"修改属性很简单，直接赋值即可。如果属性不存在，则是添加。",[1551,1803,1805],{"className":1553,"code":1804,"language":1555,"meta":1556,"style":1556},"person.city = '上海'; // 修改已有属性\nperson.gender = '男'; // 新增属性\n",[1558,1806,1807,1829],{"__ignoreMap":1556},[1561,1808,1809,1811,1813,1815,1817,1819,1822,1824,1826],{"class":1563,"line":1564},[1561,1810,1677],{"class":1571},[1561,1812,1680],{"class":1575},[1561,1814,1717],{"class":1571},[1561,1816,1576],{"class":1575},[1561,1818,1592],{"class":1575},[1561,1820,1821],{"class":1595},"上海",[1561,1823,1599],{"class":1575},[1561,1825,1759],{"class":1575},[1561,1827,1828],{"class":1762}," // 修改已有属性\n",[1561,1830,1831,1833,1835,1838,1840,1842,1845,1847,1849],{"class":1563,"line":1582},[1561,1832,1677],{"class":1571},[1561,1834,1680],{"class":1575},[1561,1836,1837],{"class":1571},"gender ",[1561,1839,1576],{"class":1575},[1561,1841,1592],{"class":1575},[1561,1843,1844],{"class":1595},"男",[1561,1846,1599],{"class":1575},[1561,1848,1759],{"class":1575},[1561,1850,1851],{"class":1762}," // 新增属性\n",[1544,1853,1854],{"id":1854},"删除属性",[1530,1856,1857,1858,1861],{},"用 ",[1558,1859,1860],{},"delete"," 关键字可以删除对象的属性。",[1551,1863,1865],{"className":1553,"code":1864,"language":1555,"meta":1556,"style":1556},"delete person.age;\nconsole.log(person);\n",[1558,1866,1867,1880],{"__ignoreMap":1556},[1561,1868,1869,1871,1874,1876,1878],{"class":1563,"line":1564},[1561,1870,1860],{"class":1575},[1561,1872,1873],{"class":1571}," person",[1561,1875,1680],{"class":1575},[1561,1877,1779],{"class":1571},[1561,1879,1672],{"class":1575},[1561,1881,1882,1884,1886,1888,1891],{"class":1563,"line":1582},[1561,1883,1743],{"class":1571},[1561,1885,1680],{"class":1575},[1561,1887,1748],{"class":1665},[1561,1889,1890],{"class":1571},"(person)",[1561,1892,1672],{"class":1575},[1544,1894,1895],{"id":1895},"遍历对象",[1530,1897,1898,1899,1902],{},"使用 ",[1558,1900,1901],{},"for...in"," 可以遍历对象的所有可枚举属性。",[1551,1904,1906],{"className":1553,"code":1905,"language":1555,"meta":1556,"style":1556},"for (var key in person) {\n    console.log(key, person[key]);\n}\n",[1558,1907,1908,1931,1960],{"__ignoreMap":1556},[1561,1909,1910,1914,1917,1919,1922,1925,1928],{"class":1563,"line":1564},[1561,1911,1913],{"class":1912},"s8pZq","for",[1561,1915,1916],{"class":1571}," (",[1561,1918,1568],{"class":1567},[1561,1920,1921],{"class":1571}," key ",[1561,1923,1924],{"class":1575},"in",[1561,1926,1927],{"class":1571}," person) ",[1561,1929,1930],{"class":1575},"{\n",[1561,1932,1933,1936,1938,1940,1943,1946,1949,1951,1954,1956,1958],{"class":1563,"line":1582},[1561,1934,1935],{"class":1571},"    console",[1561,1937,1680],{"class":1575},[1561,1939,1748],{"class":1665},[1561,1941,1942],{"class":1585},"(",[1561,1944,1945],{"class":1571},"key",[1561,1947,1948],{"class":1575},",",[1561,1950,1873],{"class":1571},[1561,1952,1953],{"class":1585},"[",[1561,1955,1945],{"class":1571},[1561,1957,1784],{"class":1585},[1561,1959,1672],{"class":1575},[1561,1961,1962],{"class":1563,"line":1605},[1561,1963,1964],{"class":1575},"}\n",[1966,1967,1968,1977],"warning",{},[1530,1969,1970,1972,1973,1976],{},[1558,1971,1901],{}," 会遍历包括继承的属性，如果只想遍历对象自身的属性，推荐用 ",[1558,1974,1975],{},"hasOwnProperty"," 检查：",[1551,1978,1980],{"className":1553,"code":1979,"language":1555,"meta":1556,"style":1556},"for (var key in person) {\n    if (person.hasOwnProperty(key)) {\n        console.log(key, person[key]);\n    }\n}\n",[1558,1981,1982,1998,2020,2045,2050],{"__ignoreMap":1556},[1561,1983,1984,1986,1988,1990,1992,1994,1996],{"class":1563,"line":1564},[1561,1985,1913],{"class":1912},[1561,1987,1916],{"class":1571},[1561,1989,1568],{"class":1567},[1561,1991,1921],{"class":1571},[1561,1993,1924],{"class":1575},[1561,1995,1927],{"class":1571},[1561,1997,1930],{"class":1575},[1561,1999,2000,2003,2005,2007,2009,2011,2013,2015,2018],{"class":1563,"line":1582},[1561,2001,2002],{"class":1912},"    if",[1561,2004,1916],{"class":1585},[1561,2006,1677],{"class":1571},[1561,2008,1680],{"class":1575},[1561,2010,1975],{"class":1665},[1561,2012,1942],{"class":1585},[1561,2014,1945],{"class":1571},[1561,2016,2017],{"class":1585},")) ",[1561,2019,1930],{"class":1575},[1561,2021,2022,2025,2027,2029,2031,2033,2035,2037,2039,2041,2043],{"class":1563,"line":1605},[1561,2023,2024],{"class":1571},"        console",[1561,2026,1680],{"class":1575},[1561,2028,1748],{"class":1665},[1561,2030,1942],{"class":1585},[1561,2032,1945],{"class":1571},[1561,2034,1948],{"class":1575},[1561,2036,1873],{"class":1571},[1561,2038,1953],{"class":1585},[1561,2040,1945],{"class":1571},[1561,2042,1784],{"class":1585},[1561,2044,1672],{"class":1575},[1561,2046,2047],{"class":1563,"line":1619},[1561,2048,2049],{"class":1575},"    }\n",[1561,2051,2052],{"class":1563,"line":1636},[1561,2053,1964],{"class":1575},[1534,2055],{},[1525,2057,2059],{"id":2058},"数组的基础操作","🧩 数组的基础操作",[1530,2061,2062],{},"数组是有序的数据集合，存储一系列数值、字符串或者其他对象。",[1544,2064,2065],{"id":2065},"创建数组",[1530,2067,2068],{},"常见创建方式：",[1551,2070,2072],{"className":1553,"code":2071,"language":1555,"meta":1556,"style":1556},"var arr1 = [10, 20, 30];\nvar arr2 = new Array(3); // 创建长度为3的空数组\n",[1558,2073,2074,2103],{"__ignoreMap":1556},[1561,2075,2076,2078,2081,2083,2086,2089,2091,2093,2095,2098,2101],{"class":1563,"line":1564},[1561,2077,1568],{"class":1567},[1561,2079,2080],{"class":1571}," arr1 ",[1561,2082,1576],{"class":1575},[1561,2084,2085],{"class":1571}," [",[1561,2087,2088],{"class":1613},"10",[1561,2090,1948],{"class":1575},[1561,2092,1614],{"class":1613},[1561,2094,1948],{"class":1575},[1561,2096,2097],{"class":1613}," 30",[1561,2099,2100],{"class":1571},"]",[1561,2102,1672],{"class":1575},[1561,2104,2105,2107,2110,2112,2114,2117,2119,2122,2125,2127],{"class":1563,"line":1582},[1561,2106,1568],{"class":1567},[1561,2108,2109],{"class":1571}," arr2 ",[1561,2111,1576],{"class":1575},[1561,2113,1662],{"class":1575},[1561,2115,2116],{"class":1665}," Array",[1561,2118,1942],{"class":1571},[1561,2120,2121],{"class":1613},"3",[1561,2123,2124],{"class":1571},")",[1561,2126,1759],{"class":1575},[1561,2128,2129],{"class":1762}," // 创建长度为3的空数组\n",[1544,2131,2132],{"id":2132},"访问数组元素",[1530,2134,2135],{},"通过索引访问，索引从 0 开始。",[1551,2137,2139],{"className":1553,"code":2138,"language":1555,"meta":1556,"style":1556},"console.log(arr1[0]); // 10\nconsole.log(arr1[2]); // 30\n",[1558,2140,2141,2162],{"__ignoreMap":1556},[1561,2142,2143,2145,2147,2149,2152,2155,2157,2159],{"class":1563,"line":1564},[1561,2144,1743],{"class":1571},[1561,2146,1680],{"class":1575},[1561,2148,1748],{"class":1665},[1561,2150,2151],{"class":1571},"(arr1[",[1561,2153,2154],{"class":1613},"0",[1561,2156,1784],{"class":1571},[1561,2158,1759],{"class":1575},[1561,2160,2161],{"class":1762}," // 10\n",[1561,2163,2164,2166,2168,2170,2172,2175,2177,2179],{"class":1563,"line":1582},[1561,2165,1743],{"class":1571},[1561,2167,1680],{"class":1575},[1561,2169,1748],{"class":1665},[1561,2171,2151],{"class":1571},[1561,2173,2174],{"class":1613},"2",[1561,2176,1784],{"class":1571},[1561,2178,1759],{"class":1575},[1561,2180,2181],{"class":1762}," // 30\n",[1544,2183,2184],{"id":2184},"修改数组元素",[1530,2186,2187],{},"直接赋值即可：",[1551,2189,2191],{"className":1553,"code":2190,"language":1555,"meta":1556,"style":1556},"arr1[1] = 25;\nconsole.log(arr1); // [10, 25, 30]\n",[1558,2192,2193,2211],{"__ignoreMap":1556},[1561,2194,2195,2198,2201,2204,2206,2209],{"class":1563,"line":1564},[1561,2196,2197],{"class":1571},"arr1[",[1561,2199,2200],{"class":1613},"1",[1561,2202,2203],{"class":1571},"] ",[1561,2205,1576],{"class":1575},[1561,2207,2208],{"class":1613}," 25",[1561,2210,1672],{"class":1575},[1561,2212,2213,2215,2217,2219,2222,2224],{"class":1563,"line":1582},[1561,2214,1743],{"class":1571},[1561,2216,1680],{"class":1575},[1561,2218,1748],{"class":1665},[1561,2220,2221],{"class":1571},"(arr1)",[1561,2223,1759],{"class":1575},[1561,2225,2226],{"class":1762}," // [10, 25, 30]\n",[1544,2228,2229],{"id":2229},"数组常用方法介绍",[1530,2231,2232],{},"数组方法是前端开发中最常用的部分，理解这些方法能极大提升工作效率。",[1534,2234],{},[1525,2236,2238],{"id":2237},"数组添加和删除元素","✨ 数组添加和删除元素",[1530,2240,2241],{},"JavaScript 数组提供了多种方法添加和删除元素。",[1551,2243,2245],{"className":1553,"code":2244,"language":1555,"meta":1556,"style":1556},"var fruits = ['苹果', '香蕉', '橙子'];\n",[1558,2246,2247],{"__ignoreMap":1556},[1561,2248,2249,2251,2254,2256,2258,2260,2263,2265,2267,2269,2272,2274,2276,2278,2281,2283,2285],{"class":1563,"line":1564},[1561,2250,1568],{"class":1567},[1561,2252,2253],{"class":1571}," fruits ",[1561,2255,1576],{"class":1575},[1561,2257,2085],{"class":1571},[1561,2259,1599],{"class":1575},[1561,2261,2262],{"class":1595},"苹果",[1561,2264,1599],{"class":1575},[1561,2266,1948],{"class":1575},[1561,2268,1592],{"class":1575},[1561,2270,2271],{"class":1595},"香蕉",[1561,2273,1599],{"class":1575},[1561,2275,1948],{"class":1575},[1561,2277,1592],{"class":1575},[1561,2279,2280],{"class":1595},"橙子",[1561,2282,1599],{"class":1575},[1561,2284,2100],{"class":1571},[1561,2286,1672],{"class":1575},[1544,2288,2290,2293],{"id":2289},"push-在数组末尾添加元素",[1558,2291,2292],{},"push","： 在数组末尾添加元素",[1551,2295,2297],{"className":1553,"code":2296,"language":1555,"meta":1556,"style":1556},"fruits.push('葡萄');\nconsole.log(fruits); // ['苹果', '香蕉', '橙子', '葡萄']\n",[1558,2298,2299,2321],{"__ignoreMap":1556},[1561,2300,2301,2304,2306,2308,2310,2312,2315,2317,2319],{"class":1563,"line":1564},[1561,2302,2303],{"class":1571},"fruits",[1561,2305,1680],{"class":1575},[1561,2307,2292],{"class":1665},[1561,2309,1942],{"class":1571},[1561,2311,1599],{"class":1575},[1561,2313,2314],{"class":1595},"葡萄",[1561,2316,1599],{"class":1575},[1561,2318,2124],{"class":1571},[1561,2320,1672],{"class":1575},[1561,2322,2323,2325,2327,2329,2332,2334],{"class":1563,"line":1582},[1561,2324,1743],{"class":1571},[1561,2326,1680],{"class":1575},[1561,2328,1748],{"class":1665},[1561,2330,2331],{"class":1571},"(fruits)",[1561,2333,1759],{"class":1575},[1561,2335,2336],{"class":1762}," // ['苹果', '香蕉', '橙子', '葡萄']\n",[1544,2338,2340,2343],{"id":2339},"pop-删除并返回数组最后一个元素",[1558,2341,2342],{},"pop","： 删除并返回数组最后一个元素",[1551,2345,2347],{"className":1553,"code":2346,"language":1555,"meta":1556,"style":1556},"var lastFruit = fruits.pop();\nconsole.log(lastFruit); // '葡萄'\nconsole.log(fruits); // ['苹果', '香蕉', '橙子']\n",[1558,2348,2349,2369,2385],{"__ignoreMap":1556},[1561,2350,2351,2353,2356,2358,2361,2363,2365,2367],{"class":1563,"line":1564},[1561,2352,1568],{"class":1567},[1561,2354,2355],{"class":1571}," lastFruit ",[1561,2357,1576],{"class":1575},[1561,2359,2360],{"class":1571}," fruits",[1561,2362,1680],{"class":1575},[1561,2364,2342],{"class":1665},[1561,2366,1669],{"class":1571},[1561,2368,1672],{"class":1575},[1561,2370,2371,2373,2375,2377,2380,2382],{"class":1563,"line":1582},[1561,2372,1743],{"class":1571},[1561,2374,1680],{"class":1575},[1561,2376,1748],{"class":1665},[1561,2378,2379],{"class":1571},"(lastFruit)",[1561,2381,1759],{"class":1575},[1561,2383,2384],{"class":1762}," // '葡萄'\n",[1561,2386,2387,2389,2391,2393,2395,2397],{"class":1563,"line":1605},[1561,2388,1743],{"class":1571},[1561,2390,1680],{"class":1575},[1561,2392,1748],{"class":1665},[1561,2394,2331],{"class":1571},[1561,2396,1759],{"class":1575},[1561,2398,2399],{"class":1762}," // ['苹果', '香蕉', '橙子']\n",[1544,2401,2403,2406],{"id":2402},"unshift-在数组开头添加元素",[1558,2404,2405],{},"unshift","： 在数组开头添加元素",[1551,2408,2410],{"className":1553,"code":2409,"language":1555,"meta":1556,"style":1556},"fruits.unshift('草莓');\nconsole.log(fruits); // ['草莓', '苹果', '香蕉', '橙子']\n",[1558,2411,2412,2433],{"__ignoreMap":1556},[1561,2413,2414,2416,2418,2420,2422,2424,2427,2429,2431],{"class":1563,"line":1564},[1561,2415,2303],{"class":1571},[1561,2417,1680],{"class":1575},[1561,2419,2405],{"class":1665},[1561,2421,1942],{"class":1571},[1561,2423,1599],{"class":1575},[1561,2425,2426],{"class":1595},"草莓",[1561,2428,1599],{"class":1575},[1561,2430,2124],{"class":1571},[1561,2432,1672],{"class":1575},[1561,2434,2435,2437,2439,2441,2443,2445],{"class":1563,"line":1582},[1561,2436,1743],{"class":1571},[1561,2438,1680],{"class":1575},[1561,2440,1748],{"class":1665},[1561,2442,2331],{"class":1571},[1561,2444,1759],{"class":1575},[1561,2446,2447],{"class":1762}," // ['草莓', '苹果', '香蕉', '橙子']\n",[1544,2449,2451,2454],{"id":2450},"shift-删除并返回数组第一个元素",[1558,2452,2453],{},"shift","： 删除并返回数组第一个元素",[1551,2456,2458],{"className":1553,"code":2457,"language":1555,"meta":1556,"style":1556},"var firstFruit = fruits.shift();\nconsole.log(firstFruit); // '草莓'\nconsole.log(fruits); // ['苹果', '香蕉', '橙子']\n",[1558,2459,2460,2479,2495],{"__ignoreMap":1556},[1561,2461,2462,2464,2467,2469,2471,2473,2475,2477],{"class":1563,"line":1564},[1561,2463,1568],{"class":1567},[1561,2465,2466],{"class":1571}," firstFruit ",[1561,2468,1576],{"class":1575},[1561,2470,2360],{"class":1571},[1561,2472,1680],{"class":1575},[1561,2474,2453],{"class":1665},[1561,2476,1669],{"class":1571},[1561,2478,1672],{"class":1575},[1561,2480,2481,2483,2485,2487,2490,2492],{"class":1563,"line":1582},[1561,2482,1743],{"class":1571},[1561,2484,1680],{"class":1575},[1561,2486,1748],{"class":1665},[1561,2488,2489],{"class":1571},"(firstFruit)",[1561,2491,1759],{"class":1575},[1561,2493,2494],{"class":1762}," // '草莓'\n",[1561,2496,2497,2499,2501,2503,2505,2507],{"class":1563,"line":1605},[1561,2498,1743],{"class":1571},[1561,2500,1680],{"class":1575},[1561,2502,1748],{"class":1665},[1561,2504,2331],{"class":1571},[1561,2506,1759],{"class":1575},[1561,2508,2399],{"class":1762},[1534,2510],{},[1525,2512,2514],{"id":2513},"查找元素和判断","🔍 查找元素和判断",[1544,2516,2518,2521],{"id":2517},"indexof查找元素位置找不到返回-1",[1558,2519,2520],{},"indexOf","：查找元素位置，找不到返回 -1",[1551,2523,2525],{"className":1553,"code":2524,"language":1555,"meta":1556,"style":1556},"var pos = fruits.indexOf('香蕉');\nconsole.log(pos); // 1\n",[1558,2526,2527,2554],{"__ignoreMap":1556},[1561,2528,2529,2531,2534,2536,2538,2540,2542,2544,2546,2548,2550,2552],{"class":1563,"line":1564},[1561,2530,1568],{"class":1567},[1561,2532,2533],{"class":1571}," pos ",[1561,2535,1576],{"class":1575},[1561,2537,2360],{"class":1571},[1561,2539,1680],{"class":1575},[1561,2541,2520],{"class":1665},[1561,2543,1942],{"class":1571},[1561,2545,1599],{"class":1575},[1561,2547,2271],{"class":1595},[1561,2549,1599],{"class":1575},[1561,2551,2124],{"class":1571},[1561,2553,1672],{"class":1575},[1561,2555,2556,2558,2560,2562,2565,2567],{"class":1563,"line":1582},[1561,2557,1743],{"class":1571},[1561,2559,1680],{"class":1575},[1561,2561,1748],{"class":1665},[1561,2563,2564],{"class":1571},"(pos)",[1561,2566,1759],{"class":1575},[1561,2568,2569],{"class":1762}," // 1\n",[1544,2571,2573,2576],{"id":2572},"includes判断元素是否存在返回布尔值",[1558,2574,2575],{},"includes","：判断元素是否存在，返回布尔值",[1551,2578,2580],{"className":1553,"code":2579,"language":1555,"meta":1556,"style":1556},"var hasApple = fruits.includes('苹果');\nconsole.log(hasApple); // true\n",[1558,2581,2582,2609],{"__ignoreMap":1556},[1561,2583,2584,2586,2589,2591,2593,2595,2597,2599,2601,2603,2605,2607],{"class":1563,"line":1564},[1561,2585,1568],{"class":1567},[1561,2587,2588],{"class":1571}," hasApple ",[1561,2590,1576],{"class":1575},[1561,2592,2360],{"class":1571},[1561,2594,1680],{"class":1575},[1561,2596,2575],{"class":1665},[1561,2598,1942],{"class":1571},[1561,2600,1599],{"class":1575},[1561,2602,2262],{"class":1595},[1561,2604,1599],{"class":1575},[1561,2606,2124],{"class":1571},[1561,2608,1672],{"class":1575},[1561,2610,2611,2613,2615,2617,2620,2622],{"class":1563,"line":1582},[1561,2612,1743],{"class":1571},[1561,2614,1680],{"class":1575},[1561,2616,1748],{"class":1665},[1561,2618,2619],{"class":1571},"(hasApple)",[1561,2621,1759],{"class":1575},[1561,2623,2624],{"class":1762}," // true\n",[1534,2626],{},[1525,2628,2630],{"id":2629},"遍历数组","🔄 遍历数组",[1544,2632,2634,2635,2637],{"id":2633},"传统-for-循环","传统 ",[1558,2636,1913],{}," 循环：",[1551,2639,2641],{"className":1553,"code":2640,"language":1555,"meta":1556,"style":1556},"for (var i = 0; i \u003C fruits.length; i++) {\n    console.log(fruits[i]);\n}\n",[1558,2642,2643,2686,2707],{"__ignoreMap":1556},[1561,2644,2645,2647,2649,2651,2654,2656,2659,2661,2663,2666,2668,2670,2673,2675,2678,2681,2684],{"class":1563,"line":1564},[1561,2646,1913],{"class":1912},[1561,2648,1916],{"class":1571},[1561,2650,1568],{"class":1567},[1561,2652,2653],{"class":1571}," i ",[1561,2655,1576],{"class":1575},[1561,2657,2658],{"class":1613}," 0",[1561,2660,1759],{"class":1575},[1561,2662,2653],{"class":1571},[1561,2664,2665],{"class":1575},"\u003C",[1561,2667,2360],{"class":1571},[1561,2669,1680],{"class":1575},[1561,2671,2672],{"class":1571},"length",[1561,2674,1759],{"class":1575},[1561,2676,2677],{"class":1571}," i",[1561,2679,2680],{"class":1575},"++",[1561,2682,2683],{"class":1571},") ",[1561,2685,1930],{"class":1575},[1561,2687,2688,2690,2692,2694,2696,2698,2700,2703,2705],{"class":1563,"line":1582},[1561,2689,1935],{"class":1571},[1561,2691,1680],{"class":1575},[1561,2693,1748],{"class":1665},[1561,2695,1942],{"class":1585},[1561,2697,2303],{"class":1571},[1561,2699,1953],{"class":1585},[1561,2701,2702],{"class":1571},"i",[1561,2704,1784],{"class":1585},[1561,2706,1672],{"class":1575},[1561,2708,2709],{"class":1563,"line":1605},[1561,2710,1964],{"class":1575},[1544,2712,2714,2717],{"id":2713},"foreach-方法",[1558,2715,2716],{},"forEach"," 方法：",[1551,2719,2721],{"className":1553,"code":2720,"language":1555,"meta":1556,"style":1556},"fruits.forEach(function (item, index) {\n    console.log(index, item);\n});\n",[1558,2722,2723,2751,2773],{"__ignoreMap":1556},[1561,2724,2725,2727,2729,2731,2733,2736,2738,2742,2744,2747,2749],{"class":1563,"line":1564},[1561,2726,2303],{"class":1571},[1561,2728,1680],{"class":1575},[1561,2730,2716],{"class":1665},[1561,2732,1942],{"class":1571},[1561,2734,2735],{"class":1567},"function",[1561,2737,1916],{"class":1575},[1561,2739,2741],{"class":2740},"sK9QF","item",[1561,2743,1948],{"class":1575},[1561,2745,2746],{"class":2740}," index",[1561,2748,2124],{"class":1575},[1561,2750,1579],{"class":1575},[1561,2752,2753,2755,2757,2759,2761,2764,2766,2769,2771],{"class":1563,"line":1582},[1561,2754,1935],{"class":1571},[1561,2756,1680],{"class":1575},[1561,2758,1748],{"class":1665},[1561,2760,1942],{"class":1585},[1561,2762,2763],{"class":1571},"index",[1561,2765,1948],{"class":1575},[1561,2767,2768],{"class":1571}," item",[1561,2770,2124],{"class":1585},[1561,2772,1672],{"class":1575},[1561,2774,2775,2778,2780],{"class":1563,"line":1605},[1561,2776,2777],{"class":1575},"}",[1561,2779,2124],{"class":1571},[1561,2781,1672],{"class":1575},[1791,2783,2784],{},[1530,2785,2786,2787,2789,2790,2792],{},"刚入门的朋友，尽量先学会 ",[1558,2788,1913],{}," 和 ",[1558,2791,2716],{},"，之后可以慢慢接触更高级的遍历方法。",[1534,2794],{},[1525,2796,2798],{"id":2797},"结合对象和数组数组中存储对象","💡 结合对象和数组：数组中存储对象",[1530,2800,2801],{},"实际项目中，数组里往往存放的是对象，比如用户列表：",[1551,2803,2805],{"className":1553,"code":2804,"language":1555,"meta":1556,"style":1556},"var users = [\n    { id: 1, name: '小张' },\n    { id: 2, name: '小李' },\n    { id: 3, name: '小王' },\n];\n",[1558,2806,2807,2819,2849,2875,2901],{"__ignoreMap":1556},[1561,2808,2809,2811,2814,2816],{"class":1563,"line":1564},[1561,2810,1568],{"class":1567},[1561,2812,2813],{"class":1571}," users ",[1561,2815,1576],{"class":1575},[1561,2817,2818],{"class":1571}," [\n",[1561,2820,2821,2824,2827,2829,2832,2834,2837,2839,2841,2844,2846],{"class":1563,"line":1582},[1561,2822,2823],{"class":1575},"    {",[1561,2825,2826],{"class":1585}," id",[1561,2828,1589],{"class":1575},[1561,2830,2831],{"class":1613}," 1",[1561,2833,1948],{"class":1575},[1561,2835,2836],{"class":1585}," name",[1561,2838,1589],{"class":1575},[1561,2840,1592],{"class":1575},[1561,2842,2843],{"class":1595},"小张",[1561,2845,1599],{"class":1575},[1561,2847,2848],{"class":1575}," },\n",[1561,2850,2851,2853,2855,2857,2860,2862,2864,2866,2868,2871,2873],{"class":1563,"line":1605},[1561,2852,2823],{"class":1575},[1561,2854,2826],{"class":1585},[1561,2856,1589],{"class":1575},[1561,2858,2859],{"class":1613}," 2",[1561,2861,1948],{"class":1575},[1561,2863,2836],{"class":1585},[1561,2865,1589],{"class":1575},[1561,2867,1592],{"class":1575},[1561,2869,2870],{"class":1595},"小李",[1561,2872,1599],{"class":1575},[1561,2874,2848],{"class":1575},[1561,2876,2877,2879,2881,2883,2886,2888,2890,2892,2894,2897,2899],{"class":1563,"line":1619},[1561,2878,2823],{"class":1575},[1561,2880,2826],{"class":1585},[1561,2882,1589],{"class":1575},[1561,2884,2885],{"class":1613}," 3",[1561,2887,1948],{"class":1575},[1561,2889,2836],{"class":1585},[1561,2891,1589],{"class":1575},[1561,2893,1592],{"class":1575},[1561,2895,2896],{"class":1595},"小王",[1561,2898,1599],{"class":1575},[1561,2900,2848],{"class":1575},[1561,2902,2903,2905],{"class":1563,"line":1636},[1561,2904,2100],{"class":1571},[1561,2906,1672],{"class":1575},[1544,2908,2909],{"id":2909},"查找对象",[1530,2911,2912],{},"假设想找 id 为 2 的用户，我们可以用循环：",[1551,2914,2916],{"className":1553,"code":2915,"language":1555,"meta":1556,"style":1556},"var user = null;\nfor (var i = 0; i \u003C users.length; i++) {\n    if (users[i].id === 2) {\n        user = users[i];\n        break;\n    }\n}\nconsole.log(user); // { id: 2, name: '小李' }\n",[1558,2917,2918,2930,2967,2996,3014,3021,3026,3031],{"__ignoreMap":1556},[1561,2919,2920,2922,2925,2927],{"class":1563,"line":1564},[1561,2921,1568],{"class":1567},[1561,2923,2924],{"class":1571}," user ",[1561,2926,1576],{"class":1575},[1561,2928,2929],{"class":1575}," null;\n",[1561,2931,2932,2934,2936,2938,2940,2942,2944,2946,2948,2950,2953,2955,2957,2959,2961,2963,2965],{"class":1563,"line":1582},[1561,2933,1913],{"class":1912},[1561,2935,1916],{"class":1571},[1561,2937,1568],{"class":1567},[1561,2939,2653],{"class":1571},[1561,2941,1576],{"class":1575},[1561,2943,2658],{"class":1613},[1561,2945,1759],{"class":1575},[1561,2947,2653],{"class":1571},[1561,2949,2665],{"class":1575},[1561,2951,2952],{"class":1571}," users",[1561,2954,1680],{"class":1575},[1561,2956,2672],{"class":1571},[1561,2958,1759],{"class":1575},[1561,2960,2677],{"class":1571},[1561,2962,2680],{"class":1575},[1561,2964,2683],{"class":1571},[1561,2966,1930],{"class":1575},[1561,2968,2969,2971,2973,2976,2978,2980,2982,2984,2987,2990,2992,2994],{"class":1563,"line":1605},[1561,2970,2002],{"class":1912},[1561,2972,1916],{"class":1585},[1561,2974,2975],{"class":1571},"users",[1561,2977,1953],{"class":1585},[1561,2979,2702],{"class":1571},[1561,2981,2100],{"class":1585},[1561,2983,1680],{"class":1575},[1561,2985,2986],{"class":1571},"id",[1561,2988,2989],{"class":1575}," ===",[1561,2991,2859],{"class":1613},[1561,2993,2683],{"class":1585},[1561,2995,1930],{"class":1575},[1561,2997,2998,3001,3004,3006,3008,3010,3012],{"class":1563,"line":1619},[1561,2999,3000],{"class":1571},"        user",[1561,3002,3003],{"class":1575}," =",[1561,3005,2952],{"class":1571},[1561,3007,1953],{"class":1585},[1561,3009,2702],{"class":1571},[1561,3011,2100],{"class":1585},[1561,3013,1672],{"class":1575},[1561,3015,3016,3019],{"class":1563,"line":1636},[1561,3017,3018],{"class":1912},"        break",[1561,3020,1672],{"class":1575},[1561,3022,3024],{"class":1563,"line":3023},6,[1561,3025,2049],{"class":1575},[1561,3027,3029],{"class":1563,"line":3028},7,[1561,3030,1964],{"class":1575},[1561,3032,3034,3036,3038,3040,3043,3045],{"class":1563,"line":3033},8,[1561,3035,1743],{"class":1571},[1561,3037,1680],{"class":1575},[1561,3039,1748],{"class":1665},[1561,3041,3042],{"class":1571},"(user)",[1561,3044,1759],{"class":1575},[1561,3046,3047],{"class":1762}," // { id: 2, name: '小李' }\n",[1791,3049,3050],{},[1530,3051,3052],{},"这种查找方式简单直观，适合前端初学者理解。",[1544,3054,3055],{"id":3055},"修改对象",[1530,3057,3058],{},"修改 id 为 3 的用户名称：",[1551,3060,3062],{"className":1553,"code":3061,"language":1555,"meta":1556,"style":1556},"for (var i = 0; i \u003C users.length; i++) {\n    if (users[i].id === 3) {\n        users[i].name = '小王子';\n        break;\n    }\n}\nconsole.log(users);\n",[1558,3063,3064,3100,3126,3153,3159,3163,3167],{"__ignoreMap":1556},[1561,3065,3066,3068,3070,3072,3074,3076,3078,3080,3082,3084,3086,3088,3090,3092,3094,3096,3098],{"class":1563,"line":1564},[1561,3067,1913],{"class":1912},[1561,3069,1916],{"class":1571},[1561,3071,1568],{"class":1567},[1561,3073,2653],{"class":1571},[1561,3075,1576],{"class":1575},[1561,3077,2658],{"class":1613},[1561,3079,1759],{"class":1575},[1561,3081,2653],{"class":1571},[1561,3083,2665],{"class":1575},[1561,3085,2952],{"class":1571},[1561,3087,1680],{"class":1575},[1561,3089,2672],{"class":1571},[1561,3091,1759],{"class":1575},[1561,3093,2677],{"class":1571},[1561,3095,2680],{"class":1575},[1561,3097,2683],{"class":1571},[1561,3099,1930],{"class":1575},[1561,3101,3102,3104,3106,3108,3110,3112,3114,3116,3118,3120,3122,3124],{"class":1563,"line":1582},[1561,3103,2002],{"class":1912},[1561,3105,1916],{"class":1585},[1561,3107,2975],{"class":1571},[1561,3109,1953],{"class":1585},[1561,3111,2702],{"class":1571},[1561,3113,2100],{"class":1585},[1561,3115,1680],{"class":1575},[1561,3117,2986],{"class":1571},[1561,3119,2989],{"class":1575},[1561,3121,2885],{"class":1613},[1561,3123,2683],{"class":1585},[1561,3125,1930],{"class":1575},[1561,3127,3128,3131,3133,3135,3137,3139,3142,3144,3146,3149,3151],{"class":1563,"line":1605},[1561,3129,3130],{"class":1571},"        users",[1561,3132,1953],{"class":1585},[1561,3134,2702],{"class":1571},[1561,3136,2100],{"class":1585},[1561,3138,1680],{"class":1575},[1561,3140,3141],{"class":1571},"name",[1561,3143,3003],{"class":1575},[1561,3145,1592],{"class":1575},[1561,3147,3148],{"class":1595},"小王子",[1561,3150,1599],{"class":1575},[1561,3152,1672],{"class":1575},[1561,3154,3155,3157],{"class":1563,"line":1619},[1561,3156,3018],{"class":1912},[1561,3158,1672],{"class":1575},[1561,3160,3161],{"class":1563,"line":1636},[1561,3162,2049],{"class":1575},[1561,3164,3165],{"class":1563,"line":3023},[1561,3166,1964],{"class":1575},[1561,3168,3169,3171,3173,3175,3178],{"class":1563,"line":3028},[1561,3170,1743],{"class":1571},[1561,3172,1680],{"class":1575},[1561,3174,1748],{"class":1665},[1561,3176,3177],{"class":1571},"(users)",[1561,3179,1672],{"class":1575},[1534,3181],{},[1525,3183,3185],{"id":3184},"实用小技巧","🔧 实用小技巧",[1544,3187,3188],{"id":3188},"合并数组",[1530,3190,1898,3191,3194],{},[1558,3192,3193],{},"concat"," 合并两个数组：",[1551,3196,3198],{"className":1553,"code":3197,"language":1555,"meta":1556,"style":1556},"var arrA = [1, 2];\nvar arrB = [3, 4];\nvar combined = arrA.concat(arrB);\nconsole.log(combined); // [1, 2, 3, 4]\n",[1558,3199,3200,3221,3243,3264],{"__ignoreMap":1556},[1561,3201,3202,3204,3207,3209,3211,3213,3215,3217,3219],{"class":1563,"line":1564},[1561,3203,1568],{"class":1567},[1561,3205,3206],{"class":1571}," arrA ",[1561,3208,1576],{"class":1575},[1561,3210,2085],{"class":1571},[1561,3212,2200],{"class":1613},[1561,3214,1948],{"class":1575},[1561,3216,2859],{"class":1613},[1561,3218,2100],{"class":1571},[1561,3220,1672],{"class":1575},[1561,3222,3223,3225,3228,3230,3232,3234,3236,3239,3241],{"class":1563,"line":1582},[1561,3224,1568],{"class":1567},[1561,3226,3227],{"class":1571}," arrB ",[1561,3229,1576],{"class":1575},[1561,3231,2085],{"class":1571},[1561,3233,2121],{"class":1613},[1561,3235,1948],{"class":1575},[1561,3237,3238],{"class":1613}," 4",[1561,3240,2100],{"class":1571},[1561,3242,1672],{"class":1575},[1561,3244,3245,3247,3250,3252,3255,3257,3259,3262],{"class":1563,"line":1605},[1561,3246,1568],{"class":1567},[1561,3248,3249],{"class":1571}," combined ",[1561,3251,1576],{"class":1575},[1561,3253,3254],{"class":1571}," arrA",[1561,3256,1680],{"class":1575},[1561,3258,3193],{"class":1665},[1561,3260,3261],{"class":1571},"(arrB)",[1561,3263,1672],{"class":1575},[1561,3265,3266,3268,3270,3272,3275,3277],{"class":1563,"line":1619},[1561,3267,1743],{"class":1571},[1561,3269,1680],{"class":1575},[1561,3271,1748],{"class":1665},[1561,3273,3274],{"class":1571},"(combined)",[1561,3276,1759],{"class":1575},[1561,3278,3279],{"class":1762}," // [1, 2, 3, 4]\n",[1544,3281,3282],{"id":3282},"数组转字符串",[1530,3284,1857,3285,3288],{},[1558,3286,3287],{},"join"," 把数组元素用指定字符连接成字符串：",[1551,3290,3292],{"className":1553,"code":3291,"language":1555,"meta":1556,"style":1556},"var str = fruits.join('，');\nconsole.log(str); // 苹果，香蕉，橙子\n",[1558,3293,3294,3322],{"__ignoreMap":1556},[1561,3295,3296,3298,3301,3303,3305,3307,3309,3311,3313,3316,3318,3320],{"class":1563,"line":1564},[1561,3297,1568],{"class":1567},[1561,3299,3300],{"class":1571}," str ",[1561,3302,1576],{"class":1575},[1561,3304,2360],{"class":1571},[1561,3306,1680],{"class":1575},[1561,3308,3287],{"class":1665},[1561,3310,1942],{"class":1571},[1561,3312,1599],{"class":1575},[1561,3314,3315],{"class":1595},"，",[1561,3317,1599],{"class":1575},[1561,3319,2124],{"class":1571},[1561,3321,1672],{"class":1575},[1561,3323,3324,3326,3328,3330,3333,3335],{"class":1563,"line":1582},[1561,3325,1743],{"class":1571},[1561,3327,1680],{"class":1575},[1561,3329,1748],{"class":1665},[1561,3331,3332],{"class":1571},"(str)",[1561,3334,1759],{"class":1575},[1561,3336,3337],{"class":1762}," // 苹果，香蕉，橙子\n",[1534,3339],{},[1525,3341,3343],{"id":3342},"小节总结","🧾 小节总结",[3345,3346,3347,3351,3354,3357],"ul",{},[3348,3349,3350],"li",{},"JavaScript 对象是一组键值对，通过点语法或中括号访问和修改属性。",[3348,3352,3353],{},"数组提供丰富的方法，能方便地增删改查元素，遍历数组也很简单。",[3348,3355,3356],{},"结合对象和数组，可以管理复杂数据，适合存储列表数据。",[3348,3358,3359,3360,3362,3363,3362,3365,3362,3367,3369,3370,3373,3374,3376],{},"常用数组方法如 ",[1558,3361,2292],{},"、",[1558,3364,2342],{},[1558,3366,2453],{},[1558,3368,2405],{},"，还有排序 ",[1558,3371,3372],{},"sort"," 和遍历 ",[1558,3375,2716],{},"，是前端开发的基础利器。",[1534,3378],{},[1525,3380,3382],{"id":3381},"知识问答qa","❓ 知识问答（Q&A）",[1530,3384,3385,3386,3389,3390,3393],{},"Q：如何给对象动态添加属性？",[3387,3388],"br",{},"\nA：直接用赋值语句给不存在的属性赋值即可，比如 ",[1558,3391,3392],{},"obj.newProp = value;","。",[1530,3395,3396,3397,2789,3399,3401,3402,3404,3405,3407,3408,3410],{},"Q：数组的 ",[1558,3398,2342],{},[1558,3400,2453],{}," 有什么区别？",[3387,3403],{},"\nA：",[1558,3406,2342],{}," 删除并返回数组末尾元素，",[1558,3409,2453],{}," 删除并返回数组开头元素。",[1530,3412,3413,3414,3416,3417,3419],{},"Q：遍历对象时，如何避免遍历继承属性？",[3387,3415],{},"\nA：使用 ",[1558,3418,1975],{}," 判断属性是否是对象自身的。",[1534,3421],{},[1525,3423,3425],{"id":3424},"小练习","🧪 小练习",[1530,3427,3428],{},"请根据以下模板代码，完成两个操作：",[3345,3430,3431,3449],{},[3348,3432,3433],{},[3434,3435,3436],"ol",{},[3348,3437,3438,3439,3442,3443,2789,3445,3448],{},"向数组 ",[1558,3440,3441],{},"students"," 末尾添加一个新学生对象，包含 ",[1558,3444,3141],{},[1558,3446,3447],{},"score"," 属性。",[3348,3450,3451],{},[3434,3452,3453],{"start":1582},[3348,3454,3455,3456,3458],{},"遍历 ",[1558,3457,3441],{},"，打印所有学生的姓名和成绩。",[1551,3460,3462],{"className":1553,"code":3461,"language":1555,"meta":1556,"style":1556},"var students = [\n    { name: '小红', score: 90 },\n    { name: '小刚', score: 85 },\n];\n\n// 在这里添加代码\n",[1558,3463,3464,3475,3502,3528,3534,3540],{"__ignoreMap":1556},[1561,3465,3466,3468,3471,3473],{"class":1563,"line":1564},[1561,3467,1568],{"class":1567},[1561,3469,3470],{"class":1571}," students ",[1561,3472,1576],{"class":1575},[1561,3474,2818],{"class":1571},[1561,3476,3477,3479,3481,3483,3485,3488,3490,3492,3495,3497,3500],{"class":1563,"line":1582},[1561,3478,2823],{"class":1575},[1561,3480,2836],{"class":1585},[1561,3482,1589],{"class":1575},[1561,3484,1592],{"class":1575},[1561,3486,3487],{"class":1595},"小红",[1561,3489,1599],{"class":1575},[1561,3491,1948],{"class":1575},[1561,3493,3494],{"class":1585}," score",[1561,3496,1589],{"class":1575},[1561,3498,3499],{"class":1613}," 90",[1561,3501,2848],{"class":1575},[1561,3503,3504,3506,3508,3510,3512,3515,3517,3519,3521,3523,3526],{"class":1563,"line":1605},[1561,3505,2823],{"class":1575},[1561,3507,2836],{"class":1585},[1561,3509,1589],{"class":1575},[1561,3511,1592],{"class":1575},[1561,3513,3514],{"class":1595},"小刚",[1561,3516,1599],{"class":1575},[1561,3518,1948],{"class":1575},[1561,3520,3494],{"class":1585},[1561,3522,1589],{"class":1575},[1561,3524,3525],{"class":1613}," 85",[1561,3527,2848],{"class":1575},[1561,3529,3530,3532],{"class":1563,"line":1619},[1561,3531,2100],{"class":1571},[1561,3533,1672],{"class":1575},[1561,3535,3536],{"class":1563,"line":1636},[1561,3537,3539],{"emptyLinePlaceholder":3538},true,"\n",[1561,3541,3542],{"class":1563,"line":3023},[1561,3543,3544],{"class":1762},"// 在这里添加代码\n",[1534,3546],{},[1530,3548,3549],{},"🎉 恭喜你已经掌握了 JS 对象和数组的基础操作、遍历、修改和实用方法啦！继续练习，你会发现它们在前端开发中的强大和灵活。",[3551,3552,3553],"style",{},"html pre.shiki code .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .syuKq, html code.shiki .syuKq{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html pre.shiki code .s8pZq, html code.shiki .s8pZq{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sK9QF, html code.shiki .sK9QF{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}",{"title":1556,"searchDepth":1582,"depth":1582,"links":3555},[3556,3557,3564,3570,3580,3586,3592,3596,3600,3601,3602],{"id":1527,"depth":1582,"text":1528},{"id":1538,"depth":1582,"text":1539,"children":3558},[3559,3560,3561,3562,3563],{"id":1546,"depth":1605,"text":1546},{"id":1730,"depth":1605,"text":1730},{"id":1798,"depth":1605,"text":1798},{"id":1854,"depth":1605,"text":1854},{"id":1895,"depth":1605,"text":1895},{"id":2058,"depth":1582,"text":2059,"children":3565},[3566,3567,3568,3569],{"id":2065,"depth":1605,"text":2065},{"id":2132,"depth":1605,"text":2132},{"id":2184,"depth":1605,"text":2184},{"id":2229,"depth":1605,"text":2229},{"id":2237,"depth":1582,"text":2238,"children":3571},[3572,3574,3576,3578],{"id":2289,"depth":1605,"text":3573},"push： 在数组末尾添加元素",{"id":2339,"depth":1605,"text":3575},"pop： 删除并返回数组最后一个元素",{"id":2402,"depth":1605,"text":3577},"unshift： 在数组开头添加元素",{"id":2450,"depth":1605,"text":3579},"shift： 删除并返回数组第一个元素",{"id":2513,"depth":1582,"text":2514,"children":3581},[3582,3584],{"id":2517,"depth":1605,"text":3583},"indexOf：查找元素位置，找不到返回 -1",{"id":2572,"depth":1605,"text":3585},"includes：判断元素是否存在，返回布尔值",{"id":2629,"depth":1582,"text":2630,"children":3587},[3588,3590],{"id":2633,"depth":1605,"text":3589},"传统 for 循环：",{"id":2713,"depth":1605,"text":3591},"forEach 方法：",{"id":2797,"depth":1582,"text":2798,"children":3593},[3594,3595],{"id":2909,"depth":1605,"text":2909},{"id":3055,"depth":1605,"text":3055},{"id":3184,"depth":1582,"text":3185,"children":3597},[3598,3599],{"id":3188,"depth":1605,"text":3188},{"id":3282,"depth":1605,"text":3282},{"id":3342,"depth":1582,"text":3343},{"id":3381,"depth":1582,"text":3382},{"id":3424,"depth":1582,"text":3425},"本文深入浅出地讲解 JavaScript 中对象和数组的常用操作，帮助前端入门小白掌握基础技能。","md",null,{},{"title":178},{"title":178,"description":3603},"4gxir9862x",[3611,3613],{"title":174,"path":175,"stem":176,"description":3612,"children":-1},"详细剖析 JavaScript 函数的用法、原理与细节，帮助前端小白真正理解函数的本质。",{"title":182,"path":183,"stem":184,"description":3614,"children":-1},"通过实用示例深入理解 JavaScript 中 Math 和 Date 对象的常见用法，适合前端初学者快速掌握。",1784715106237]