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引言",[1531,1532,1533],"p",{},"前端开发中，操作对象是非常频繁的。但很多小白朋友们在复制对象时容易踩坑，比如修改一个对象的副本，结果却影响了原对象。这篇文章会帮你搞懂对象的引用地址、浅拷贝、深拷贝到底是什么，怎么实现它们，避免不必要的错误，让你的代码更加健壮灵活。",[1535,1536],"hr",{},[1526,1538,1540],{"id":1539},"什么是对象的引用地址","🧩 什么是对象的引用地址？",[1531,1542,1543],{},"值类型和引用类型的区别在于它们在内存中存储的方式不同，值类型的数据是存储在栈中，而引用类型的数据是存储在堆中。对象就是属于引用类型。",[1545,1546,1547],"h3",{"id":1547},"值类型存储方式",[1549,1550,1555],"pre",{"className":1551,"code":1552,"language":1553,"meta":1554,"style":1554},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","var a = 'xiaoming';\nvar b = 'libai';\nvar c = b;\n","js","",[1556,1557,1558,1588,1607],"code",{"__ignoreMap":1554},[1559,1560,1563,1567,1571,1575,1578,1582,1585],"span",{"class":1561,"line":1562},"line",1,[1559,1564,1566],{"class":1565},"s50WR","var",[1559,1568,1570],{"class":1569},"sndM8"," a ",[1559,1572,1574],{"class":1573},"s86vT","=",[1559,1576,1577],{"class":1573}," 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a;\n",[1556,1685,1686,1725],{"__ignoreMap":1554},[1559,1687,1688,1690,1692,1694,1697,1701,1704,1706,1708,1710,1713,1716,1718,1722],{"class":1561,"line":1562},[1559,1689,1566],{"class":1565},[1559,1691,1570],{"class":1569},[1559,1693,1574],{"class":1573},[1559,1695,1696],{"class":1573}," {",[1559,1698,1700],{"class":1699},"sd2Uz"," name",[1559,1702,1703],{"class":1573},":",[1559,1705,1577],{"class":1573},[1559,1707,1581],{"class":1580},[1559,1709,1584],{"class":1573},[1559,1711,1712],{"class":1573},",",[1559,1714,1715],{"class":1699}," age",[1559,1717,1703],{"class":1573},[1559,1719,1721],{"class":1720},"smPcV"," 18",[1559,1723,1724],{"class":1573}," };\n",[1559,1726,1727,1729,1731,1733,1736],{"class":1561,"line":1590},[1559,1728,1566],{"class":1565},[1559,1730,1595],{"class":1569},[1559,1732,1574],{"class":1573},[1559,1734,1735],{"class":1569}," a",[1559,1737,1587],{"class":1573},[1531,1739,1624],{},[1626,1741,1742,1752],{},[1629,1743,1744],{},[1632,1745,1746,1748,1750],{},[1635,1747,1637],{},[1635,1749,1640],{},[1635,1751,1643],{},[1645,1753,1754,1764],{},[1632,1755,1756,1758,1761],{},[1650,1757,1652],{},[1650,1759,1760],{},"Object",[1650,1762,1763],{},"0x000001",[1632,1765,1766,1768,1770],{},[1650,1767,1663],{},[1650,1769,1760],{},[1650,1771,1763],{},[1531,1773,1774],{},"堆模型",[1626,1776,1777,1790],{},[1629,1778,1779],{},[1632,1780,1781,1784,1787],{},[1635,1782,1783],{},"地址信息",[1635,1785,1786],{},"属性 name",[1635,1788,1789],{},"属性 age",[1645,1791,1792],{},[1632,1793,1794,1796,1798],{},[1650,1795,1763],{},[1650,1797,1581],{},[1650,1799,1800],{},"18",[1535,1802],{},[1526,1804,1806],{"id":1805},"️-直接复制对象会出现什么问题","⚠️ 直接复制对象会出现什么问题？",[1531,1808,1809],{},"如果直接用赋值操作复制对象，实际上只是复制了引用地址，而不是复制对象本身。本质上，两个变量指向的是同一个对象，改动任何一个都会影响到另一个。",[1531,1811,1812],{},"这会导致很多难以察觉的 Bug，特别是当复杂对象被多个地方使用时，在某一处对该对象的修改会影响到所有使用它的地方。",[1535,1814],{},[1526,1816,1818],{"id":1817},"️-什么是浅拷贝","✂️ 什么是浅拷贝？",[1531,1820,1821,1822,1826],{},"浅拷贝就是复制对象的",[1823,1824,1825],"strong",{},"第一层属性","，如果属性值是值类型（字符串、数字等），直接复制值；如果属性值是对象或数组，仍然复制的是它们的引用地址。",[1531,1828,1829],{},"举个例子：",[1549,1831,1833],{"className":1551,"code":1832,"language":1553,"meta":1554,"style":1554},"var obj1 = {\n    name: '小明',\n    hobby: ['篮球', '足球'],\n};\nvar obj2 = Object.assign({}, obj1);\nobj2.name = '小红';\nobj2.hobby.push('游泳');\n\nconsole.log(obj1.name); // 小明，值类型改动不影响原对象\nconsole.log(obj1.hobby); // [\"篮球\", \"足球\", \"游泳\"]，引用类型改动影响到了原对象\n",[1556,1834,1835,1847,1864,1895,1901,1932,1954,1983,1990,2016],{"__ignoreMap":1554},[1559,1836,1837,1839,1842,1844],{"class":1561,"line":1562},[1559,1838,1566],{"class":1565},[1559,1840,1841],{"class":1569}," obj1 ",[1559,1843,1574],{"class":1573},[1559,1845,1846],{"class":1573}," {\n",[1559,1848,1849,1852,1854,1856,1859,1861],{"class":1561,"line":1590},[1559,1850,1851],{"class":1699},"    name",[1559,1853,1703],{"class":1573},[1559,1855,1577],{"class":1573},[1559,1857,1858],{"class":1580},"小明",[1559,1860,1584],{"class":1573},[1559,1862,1863],{"class":1573},",\n",[1559,1865,1866,1869,1871,1874,1876,1879,1881,1883,1885,1888,1890,1893],{"class":1561,"line":1609},[1559,1867,1868],{"class":1699},"    hobby",[1559,1870,1703],{"class":1573},[1559,1872,1873],{"class":1569}," [",[1559,1875,1584],{"class":1573},[1559,1877,1878],{"class":1580},"篮球",[1559,1880,1584],{"class":1573},[1559,1882,1712],{"class":1573},[1559,1884,1577],{"class":1573},[1559,1886,1887],{"class":1580},"足球",[1559,1889,1584],{"class":1573},[1559,1891,1892],{"class":1569},"]",[1559,1894,1863],{"class":1573},[1559,1896,1898],{"class":1561,"line":1897},4,[1559,1899,1900],{"class":1573},"};\n",[1559,1902,1904,1906,1909,1911,1914,1917,1921,1924,1927,1930],{"class":1561,"line":1903},5,[1559,1905,1566],{"class":1565},[1559,1907,1908],{"class":1569}," obj2 ",[1559,1910,1574],{"class":1573},[1559,1912,1913],{"class":1569}," Object",[1559,1915,1916],{"class":1573},".",[1559,1918,1920],{"class":1919},"swgpB","assign",[1559,1922,1923],{"class":1569},"(",[1559,1925,1926],{"class":1573},"{},",[1559,1928,1929],{"class":1569}," obj1)",[1559,1931,1587],{"class":1573},[1559,1933,1935,1938,1940,1943,1945,1947,1950,1952],{"class":1561,"line":1934},6,[1559,1936,1937],{"class":1569},"obj2",[1559,1939,1916],{"class":1573},[1559,1941,1942],{"class":1569},"name ",[1559,1944,1574],{"class":1573},[1559,1946,1577],{"class":1573},[1559,1948,1949],{"class":1580},"小红",[1559,1951,1584],{"class":1573},[1559,1953,1587],{"class":1573},[1559,1955,1957,1959,1961,1964,1966,1969,1971,1973,1976,1978,1981],{"class":1561,"line":1956},7,[1559,1958,1937],{"class":1569},[1559,1960,1916],{"class":1573},[1559,1962,1963],{"class":1569},"hobby",[1559,1965,1916],{"class":1573},[1559,1967,1968],{"class":1919},"push",[1559,1970,1923],{"class":1569},[1559,1972,1584],{"class":1573},[1559,1974,1975],{"class":1580},"游泳",[1559,1977,1584],{"class":1573},[1559,1979,1980],{"class":1569},")",[1559,1982,1587],{"class":1573},[1559,1984,1986],{"class":1561,"line":1985},8,[1559,1987,1989],{"emptyLinePlaceholder":1988},true,"\n",[1559,1991,1993,1996,1998,2001,2004,2006,2009,2012],{"class":1561,"line":1992},9,[1559,1994,1995],{"class":1569},"console",[1559,1997,1916],{"class":1573},[1559,1999,2000],{"class":1919},"log",[1559,2002,2003],{"class":1569},"(obj1",[1559,2005,1916],{"class":1573},[1559,2007,2008],{"class":1569},"name)",[1559,2010,2011],{"class":1573},";",[1559,2013,2015],{"class":2014},"syuKq"," // 小明，值类型改动不影响原对象\n",[1559,2017,2019,2021,2023,2025,2027,2029,2032,2034],{"class":1561,"line":2018},10,[1559,2020,1995],{"class":1569},[1559,2022,1916],{"class":1573},[1559,2024,2000],{"class":1919},[1559,2026,2003],{"class":1569},[1559,2028,1916],{"class":1573},[1559,2030,2031],{"class":1569},"hobby)",[1559,2033,2011],{"class":1573},[1559,2035,2036],{"class":2014}," // [\"篮球\", \"足球\", \"游泳\"]，引用类型改动影响到了原对象\n",[1531,2038,2039,2040,2042,2043,2046,2047,2050,2051,2053],{},"这里 ",[1556,2041,1937],{}," 的 ",[1556,2044,2045],{},"name"," 字段修改不会影响 ",[1556,2048,2049],{},"obj1","，但是 ",[1556,2052,1963],{}," 数组被修改了，原对象也跟着变了。",[1535,2055],{},[1545,2057,2059],{"id":2058},"如何实现一个浅拷贝","🔨 如何实现一个浅拷贝？",[1531,2061,2062],{},"JavaScript 提供了几个常用方法实现浅拷贝：",[2064,2065,2066,2073,2076],"ul",{},[2067,2068,2069,2070],"li",{},"使用 ",[1556,2071,2072],{},"Object.assign()",[2067,2074,2075],{},"使用扩展运算符（ES6，但本文章避免 ES6 用法）",[2067,2077,2078],{},"自己写一个循环赋值的函数",[1531,2080,2081,2082,2085],{},"示例：用 ",[1556,2083,2084],{},"Object.assign"," 实现浅拷贝",[1549,2087,2089],{"className":1551,"code":2088,"language":1553,"meta":1554,"style":1554},"var source = { a: 1, b: { c: 2 } };\nvar copy = Object.assign({}, source);\nconsole.log(copy.b === source.b); // true，b 是引用地址相同\n",[1556,2090,2091,2130,2154],{"__ignoreMap":1554},[1559,2092,2093,2095,2098,2100,2102,2104,2106,2109,2111,2113,2115,2117,2120,2122,2125,2128],{"class":1561,"line":1562},[1559,2094,1566],{"class":1565},[1559,2096,2097],{"class":1569}," source ",[1559,2099,1574],{"class":1573},[1559,2101,1696],{"class":1573},[1559,2103,1735],{"class":1699},[1559,2105,1703],{"class":1573},[1559,2107,2108],{"class":1720}," 1",[1559,2110,1712],{"class":1573},[1559,2112,1619],{"class":1699},[1559,2114,1703],{"class":1573},[1559,2116,1696],{"class":1573},[1559,2118,2119],{"class":1699}," c",[1559,2121,1703],{"class":1573},[1559,2123,2124],{"class":1720}," 2",[1559,2126,2127],{"class":1573}," }",[1559,2129,1724],{"class":1573},[1559,2131,2132,2134,2137,2139,2141,2143,2145,2147,2149,2152],{"class":1561,"line":1590},[1559,2133,1566],{"class":1565},[1559,2135,2136],{"class":1569}," copy ",[1559,2138,1574],{"class":1573},[1559,2140,1913],{"class":1569},[1559,2142,1916],{"class":1573},[1559,2144,1920],{"class":1919},[1559,2146,1923],{"class":1569},[1559,2148,1926],{"class":1573},[1559,2150,2151],{"class":1569}," source)",[1559,2153,1587],{"class":1573},[1559,2155,2156,2158,2160,2162,2165,2167,2170,2173,2176,2178,2181,2183],{"class":1561,"line":1609},[1559,2157,1995],{"class":1569},[1559,2159,1916],{"class":1573},[1559,2161,2000],{"class":1919},[1559,2163,2164],{"class":1569},"(copy",[1559,2166,1916],{"class":1573},[1559,2168,2169],{"class":1569},"b ",[1559,2171,2172],{"class":1573},"===",[1559,2174,2175],{"class":1569}," source",[1559,2177,1916],{"class":1573},[1559,2179,2180],{"class":1569},"b)",[1559,2182,2011],{"class":1573},[1559,2184,2185],{"class":2014}," // true，b 是引用地址相同\n",[2187,2188,2189],"tip",{},[1531,2190,2191],{},"浅拷贝适合对象属性值都是值类型，或者不需要完全独立的时候用。",[1535,2193],{},[1526,2195,2197],{"id":2196},"什么是深拷贝","🌊 什么是深拷贝？",[1531,2199,2200],{},"深拷贝则是递归地复制对象的所有层级，确保复制出来的对象和原对象完全独立，彼此之间不会互相影响。",[1531,2202,2203],{},"简单说，就是不仅复制第一层属性，还要复制嵌套的对象、数组，直到最底层的值都是新的。",[1545,2205,2207],{"id":2206},"如何实现一个深拷贝","🛠 如何实现一个深拷贝？",[1531,2209,2210],{},"深拷贝要递归地复制所有属性，常见实现方式有：",[2064,2212,2213,2223],{},[2067,2214,2069,2215,2218,2219,2222],{},[1556,2216,2217],{},"JSON.parse(JSON.stringify(obj))","，这是最简单快速的深拷贝方案，但有些限制，比如不能拷贝函数、",[1556,2220,2221],{},"undefined","、循环引用等。",[2067,2224,2225],{},"自己写递归函数，判断数据类型，逐层复制。",[1531,2227,2228],{},"示例：使用 JSON 实现深拷贝",[1549,2230,2232],{"className":1551,"code":2231,"language":1553,"meta":1554,"style":1554},"var source = {\n    a: 1,\n    b: { c: 2 },\n    d: function () {\n        console.log('hello');\n    },\n};\nvar deepCopy = JSON.parse(JSON.stringify(source));\nconsole.log(deepCopy); // { a: 1, b: { c: 2 } }, 函数被忽略了\n",[1556,2233,2234,2244,2255,2273,2288,2310,2315,2319,2349],{"__ignoreMap":1554},[1559,2235,2236,2238,2240,2242],{"class":1561,"line":1562},[1559,2237,1566],{"class":1565},[1559,2239,2097],{"class":1569},[1559,2241,1574],{"class":1573},[1559,2243,1846],{"class":1573},[1559,2245,2246,2249,2251,2253],{"class":1561,"line":1590},[1559,2247,2248],{"class":1699},"    a",[1559,2250,1703],{"class":1573},[1559,2252,2108],{"class":1720},[1559,2254,1863],{"class":1573},[1559,2256,2257,2260,2262,2264,2266,2268,2270],{"class":1561,"line":1609},[1559,2258,2259],{"class":1699},"    b",[1559,2261,1703],{"class":1573},[1559,2263,1696],{"class":1573},[1559,2265,2119],{"class":1699},[1559,2267,1703],{"class":1573},[1559,2269,2124],{"class":1720},[1559,2271,2272],{"class":1573}," },\n",[1559,2274,2275,2278,2280,2283,2286],{"class":1561,"line":1897},[1559,2276,2277],{"class":1919},"    d",[1559,2279,1703],{"class":1573},[1559,2281,2282],{"class":1565}," function",[1559,2284,2285],{"class":1573}," ()",[1559,2287,1846],{"class":1573},[1559,2289,2290,2293,2295,2297,2299,2301,2304,2306,2308],{"class":1561,"line":1903},[1559,2291,2292],{"class":1569},"        console",[1559,2294,1916],{"class":1573},[1559,2296,2000],{"class":1919},[1559,2298,1923],{"class":1699},[1559,2300,1584],{"class":1573},[1559,2302,2303],{"class":1580},"hello",[1559,2305,1584],{"class":1573},[1559,2307,1980],{"class":1699},[1559,2309,1587],{"class":1573},[1559,2311,2312],{"class":1561,"line":1934},[1559,2313,2314],{"class":1573},"    },\n",[1559,2316,2317],{"class":1561,"line":1956},[1559,2318,1900],{"class":1573},[1559,2320,2321,2323,2326,2328,2331,2333,2336,2339,2341,2344,2347],{"class":1561,"line":1985},[1559,2322,1566],{"class":1565},[1559,2324,2325],{"class":1569}," deepCopy ",[1559,2327,1574],{"class":1573},[1559,2329,2330],{"class":1569}," JSON",[1559,2332,1916],{"class":1573},[1559,2334,2335],{"class":1919},"parse",[1559,2337,2338],{"class":1569},"(JSON",[1559,2340,1916],{"class":1573},[1559,2342,2343],{"class":1919},"stringify",[1559,2345,2346],{"class":1569},"(source))",[1559,2348,1587],{"class":1573},[1559,2350,2351,2353,2355,2357,2360,2362],{"class":1561,"line":1992},[1559,2352,1995],{"class":1569},[1559,2354,1916],{"class":1573},[1559,2356,2000],{"class":1919},[1559,2358,2359],{"class":1569},"(deepCopy)",[1559,2361,2011],{"class":1573},[1559,2363,2364],{"class":2014}," // { a: 1, b: { c: 2 } }, 函数被忽略了\n",[1531,2366,2367],{},"下面演示一个简单的递归深拷贝实现：",[1549,2369,2371],{"className":1551,"code":2370,"language":1553,"meta":1554,"style":1554},"function deepClone(obj) {\n    if (obj === null) return null;\n    if (typeof obj !== 'object') return obj;\n\n    var copy = Array.isArray(obj) ? [] : {};\n\n    for (var key in obj) {\n        if (obj.hasOwnProperty(key)) {\n            copy[key] = deepClone(obj[key]);\n        }\n    }\n\n    return copy;\n}\n\nvar source = { a: 1, b: { c: 2 } };\nvar copy = deepClone(source);\ncopy.b.c = 3;\nconsole.log(source.b.c); // 2，互不影响\n",[1556,2372,2373,2391,2417,2447,2451,2487,2491,2513,2537,2567,2572,2578,2583,2593,2599,2604,2639,2655,2677],{"__ignoreMap":1554},[1559,2374,2375,2378,2381,2383,2387,2389],{"class":1561,"line":1562},[1559,2376,2377],{"class":1565},"function",[1559,2379,2380],{"class":1919}," deepClone",[1559,2382,1923],{"class":1573},[1559,2384,2386],{"class":2385},"sK9QF","obj",[1559,2388,1980],{"class":1573},[1559,2390,1846],{"class":1573},[1559,2392,2393,2397,2400,2402,2405,2408,2411,2414],{"class":1561,"line":1590},[1559,2394,2396],{"class":2395},"s8pZq","    if",[1559,2398,2399],{"class":1699}," (",[1559,2401,2386],{"class":1569},[1559,2403,2404],{"class":1573}," ===",[1559,2406,2407],{"class":1573}," null",[1559,2409,2410],{"class":1699},") ",[1559,2412,2413],{"class":2395},"return",[1559,2415,2416],{"class":1573}," null;\n",[1559,2418,2419,2421,2423,2426,2429,2432,2434,2437,2439,2441,2443,2445],{"class":1561,"line":1609},[1559,2420,2396],{"class":2395},[1559,2422,2399],{"class":1699},[1559,2424,2425],{"class":1573},"typeof",[1559,2427,2428],{"class":1569}," obj",[1559,2430,2431],{"class":1573}," !==",[1559,2433,1577],{"class":1573},[1559,2435,2436],{"class":1580},"object",[1559,2438,1584],{"class":1573},[1559,2440,2410],{"class":1699},[1559,2442,2413],{"class":2395},[1559,2444,2428],{"class":1569},[1559,2446,1587],{"class":1573},[1559,2448,2449],{"class":1561,"line":1897},[1559,2450,1989],{"emptyLinePlaceholder":1988},[1559,2452,2453,2456,2459,2462,2465,2467,2470,2472,2474,2476,2479,2482,2484],{"class":1561,"line":1903},[1559,2454,2455],{"class":1565},"    var",[1559,2457,2458],{"class":1569}," copy",[1559,2460,2461],{"class":1573}," =",[1559,2463,2464],{"class":1569}," Array",[1559,2466,1916],{"class":1573},[1559,2468,2469],{"class":1919},"isArray",[1559,2471,1923],{"class":1699},[1559,2473,2386],{"class":1569},[1559,2475,2410],{"class":1699},[1559,2477,2478],{"class":1573},"?",[1559,2480,2481],{"class":1699}," [] ",[1559,2483,1703],{"class":1573},[1559,2485,2486],{"class":1573}," {};\n",[1559,2488,2489],{"class":1561,"line":1934},[1559,2490,1989],{"emptyLinePlaceholder":1988},[1559,2492,2493,2496,2498,2500,2503,2506,2508,2510],{"class":1561,"line":1956},[1559,2494,2495],{"class":2395},"    for",[1559,2497,2399],{"class":1699},[1559,2499,1566],{"class":1565},[1559,2501,2502],{"class":1569}," key",[1559,2504,2505],{"class":1573}," in",[1559,2507,2428],{"class":1569},[1559,2509,2410],{"class":1699},[1559,2511,2512],{"class":1573},"{\n",[1559,2514,2515,2518,2520,2522,2524,2527,2529,2532,2535],{"class":1561,"line":1985},[1559,2516,2517],{"class":2395},"        if",[1559,2519,2399],{"class":1699},[1559,2521,2386],{"class":1569},[1559,2523,1916],{"class":1573},[1559,2525,2526],{"class":1919},"hasOwnProperty",[1559,2528,1923],{"class":1699},[1559,2530,2531],{"class":1569},"key",[1559,2533,2534],{"class":1699},")) ",[1559,2536,2512],{"class":1573},[1559,2538,2539,2542,2545,2547,2550,2552,2554,2556,2558,2560,2562,2565],{"class":1561,"line":1992},[1559,2540,2541],{"class":1569},"            copy",[1559,2543,2544],{"class":1699},"[",[1559,2546,2531],{"class":1569},[1559,2548,2549],{"class":1699},"] ",[1559,2551,1574],{"class":1573},[1559,2553,2380],{"class":1919},[1559,2555,1923],{"class":1699},[1559,2557,2386],{"class":1569},[1559,2559,2544],{"class":1699},[1559,2561,2531],{"class":1569},[1559,2563,2564],{"class":1699},"])",[1559,2566,1587],{"class":1573},[1559,2568,2569],{"class":1561,"line":2018},[1559,2570,2571],{"class":1573},"        }\n",[1559,2573,2575],{"class":1561,"line":2574},11,[1559,2576,2577],{"class":1573},"    }\n",[1559,2579,2581],{"class":1561,"line":2580},12,[1559,2582,1989],{"emptyLinePlaceholder":1988},[1559,2584,2586,2589,2591],{"class":1561,"line":2585},13,[1559,2587,2588],{"class":2395},"    return",[1559,2590,2458],{"class":1569},[1559,2592,1587],{"class":1573},[1559,2594,2596],{"class":1561,"line":2595},14,[1559,2597,2598],{"class":1573},"}\n",[1559,2600,2602],{"class":1561,"line":2601},15,[1559,2603,1989],{"emptyLinePlaceholder":1988},[1559,2605,2607,2609,2611,2613,2615,2617,2619,2621,2623,2625,2627,2629,2631,2633,2635,2637],{"class":1561,"line":2606},16,[1559,2608,1566],{"class":1565},[1559,2610,2097],{"class":1569},[1559,2612,1574],{"class":1573},[1559,2614,1696],{"class":1573},[1559,2616,1735],{"class":1699},[1559,2618,1703],{"class":1573},[1559,2620,2108],{"class":1720},[1559,2622,1712],{"class":1573},[1559,2624,1619],{"class":1699},[1559,2626,1703],{"class":1573},[1559,2628,1696],{"class":1573},[1559,2630,2119],{"class":1699},[1559,2632,1703],{"class":1573},[1559,2634,2124],{"class":1720},[1559,2636,2127],{"class":1573},[1559,2638,1724],{"class":1573},[1559,2640,2642,2644,2646,2648,2650,2653],{"class":1561,"line":2641},17,[1559,2643,1566],{"class":1565},[1559,2645,2136],{"class":1569},[1559,2647,1574],{"class":1573},[1559,2649,2380],{"class":1919},[1559,2651,2652],{"class":1569},"(source)",[1559,2654,1587],{"class":1573},[1559,2656,2658,2661,2663,2665,2667,2670,2672,2675],{"class":1561,"line":2657},18,[1559,2659,2660],{"class":1569},"copy",[1559,2662,1916],{"class":1573},[1559,2664,1663],{"class":1569},[1559,2666,1916],{"class":1573},[1559,2668,2669],{"class":1569},"c ",[1559,2671,1574],{"class":1573},[1559,2673,2674],{"class":1720}," 3",[1559,2676,1587],{"class":1573},[1559,2678,2680,2682,2684,2686,2689,2691,2693,2695,2698,2700],{"class":1561,"line":2679},19,[1559,2681,1995],{"class":1569},[1559,2683,1916],{"class":1573},[1559,2685,2000],{"class":1919},[1559,2687,2688],{"class":1569},"(source",[1559,2690,1916],{"class":1573},[1559,2692,1663],{"class":1569},[1559,2694,1916],{"class":1573},[1559,2696,2697],{"class":1569},"c)",[1559,2699,2011],{"class":1573},[1559,2701,2702],{"class":2014}," // 2，互不影响\n",[2704,2705,2706],"warning",{},[1531,2707,2708,2709,2712],{},"深拷贝的递归实现要注意循环引用的问题，否则容易造成死循环。实际项目中可考虑使用成熟库，比如 Lodash 的 ",[1556,2710,2711],{},"_.cloneDeep","。",[1535,2714],{},[1526,2716,2718],{"id":2717},"补充知识点为什么要区分浅拷贝和深拷贝","💡 补充知识点：为什么要区分浅拷贝和深拷贝？",[1531,2720,2721],{},"在前端开发中，数据状态管理非常重要。比如在 React、Vue 中操作状态时，如果不正确复制对象，可能导致没有触发视图更新，或者出现数据污染。",[1531,2723,2724],{},"此外，性能也是考虑因素。深拷贝对大对象很耗性能，浅拷贝虽然不完全复制，但速度快。合理选择拷贝方式，既保证正确性又提高效率。",[1535,2726],{},[1526,2728,2730],{"id":2729},"实际案例更新数组中的对象","🧰 实际案例：更新数组中的对象",[1531,2732,2733],{},"假设我们有一个用户列表对象数组，需要更新其中某个用户的年龄。",[1531,2735,2736],{},"如果直接浅拷贝数组，修改其中一个用户对象，原数组也会改变。用深拷贝就能避免这个问题。",[1549,2738,2740],{"className":1551,"code":2739,"language":1553,"meta":1554,"style":1554},"var users = [\n    { id: 1, name: '小明', age: 18 },\n    { id: 2, name: '小红', age: 20 },\n];\n\nvar copiedUsers = JSON.parse(JSON.stringify(users));\ncopiedUsers[0].age = 19;\n\nconsole.log(users[0].age); // 18，原数组不受影响\n",[1556,2741,2742,2754,2788,2821,2827,2831,2857,2879,2883],{"__ignoreMap":1554},[1559,2743,2744,2746,2749,2751],{"class":1561,"line":1562},[1559,2745,1566],{"class":1565},[1559,2747,2748],{"class":1569}," users ",[1559,2750,1574],{"class":1573},[1559,2752,2753],{"class":1569}," [\n",[1559,2755,2756,2759,2762,2764,2766,2768,2770,2772,2774,2776,2778,2780,2782,2784,2786],{"class":1561,"line":1590},[1559,2757,2758],{"class":1573},"    {",[1559,2760,2761],{"class":1699}," id",[1559,2763,1703],{"class":1573},[1559,2765,2108],{"class":1720},[1559,2767,1712],{"class":1573},[1559,2769,1700],{"class":1699},[1559,2771,1703],{"class":1573},[1559,2773,1577],{"class":1573},[1559,2775,1858],{"class":1580},[1559,2777,1584],{"class":1573},[1559,2779,1712],{"class":1573},[1559,2781,1715],{"class":1699},[1559,2783,1703],{"class":1573},[1559,2785,1721],{"class":1720},[1559,2787,2272],{"class":1573},[1559,2789,2790,2792,2794,2796,2798,2800,2802,2804,2806,2808,2810,2812,2814,2816,2819],{"class":1561,"line":1609},[1559,2791,2758],{"class":1573},[1559,2793,2761],{"class":1699},[1559,2795,1703],{"class":1573},[1559,2797,2124],{"class":1720},[1559,2799,1712],{"class":1573},[1559,2801,1700],{"class":1699},[1559,2803,1703],{"class":1573},[1559,2805,1577],{"class":1573},[1559,2807,1949],{"class":1580},[1559,2809,1584],{"class":1573},[1559,2811,1712],{"class":1573},[1559,2813,1715],{"class":1699},[1559,2815,1703],{"class":1573},[1559,2817,2818],{"class":1720}," 20",[1559,2820,2272],{"class":1573},[1559,2822,2823,2825],{"class":1561,"line":1897},[1559,2824,1892],{"class":1569},[1559,2826,1587],{"class":1573},[1559,2828,2829],{"class":1561,"line":1903},[1559,2830,1989],{"emptyLinePlaceholder":1988},[1559,2832,2833,2835,2838,2840,2842,2844,2846,2848,2850,2852,2855],{"class":1561,"line":1934},[1559,2834,1566],{"class":1565},[1559,2836,2837],{"class":1569}," copiedUsers ",[1559,2839,1574],{"class":1573},[1559,2841,2330],{"class":1569},[1559,2843,1916],{"class":1573},[1559,2845,2335],{"class":1919},[1559,2847,2338],{"class":1569},[1559,2849,1916],{"class":1573},[1559,2851,2343],{"class":1919},[1559,2853,2854],{"class":1569},"(users))",[1559,2856,1587],{"class":1573},[1559,2858,2859,2862,2865,2867,2869,2872,2874,2877],{"class":1561,"line":1956},[1559,2860,2861],{"class":1569},"copiedUsers[",[1559,2863,2864],{"class":1720},"0",[1559,2866,1892],{"class":1569},[1559,2868,1916],{"class":1573},[1559,2870,2871],{"class":1569},"age ",[1559,2873,1574],{"class":1573},[1559,2875,2876],{"class":1720}," 19",[1559,2878,1587],{"class":1573},[1559,2880,2881],{"class":1561,"line":1985},[1559,2882,1989],{"emptyLinePlaceholder":1988},[1559,2884,2885,2887,2889,2891,2894,2896,2898,2900,2903,2905],{"class":1561,"line":1992},[1559,2886,1995],{"class":1569},[1559,2888,1916],{"class":1573},[1559,2890,2000],{"class":1919},[1559,2892,2893],{"class":1569},"(users[",[1559,2895,2864],{"class":1720},[1559,2897,1892],{"class":1569},[1559,2899,1916],{"class":1573},[1559,2901,2902],{"class":1569},"age)",[1559,2904,2011],{"class":1573},[1559,2906,2907],{"class":2014}," // 18，原数组不受影响\n",[1535,2909],{},[1526,2911,2913],{"id":2912},"小节总结","🧾 小节总结",[2064,2915,2916,2919,2922,2925,2932],{},[2067,2917,2918],{},"对象变量存储的是引用地址，复制时要注意引用共享问题",[2067,2920,2921],{},"浅拷贝只复制第一层属性，引用类型仍指向同一地址",[2067,2923,2924],{},"深拷贝递归复制所有层级，确保数据完全独立",[2067,2926,2927,2928,2931],{},"简单快速深拷贝可用 ",[1556,2929,2930],{},"JSON.parse(JSON.stringify())","，但有局限",[2067,2933,2934],{},"复杂应用建议用递归函数或成熟库实现深拷贝，避免循环引用陷阱",[1535,2936],{},[1526,2938,2940],{"id":2939},"知识问答qa","❓ 知识问答（Q&A）",[1531,2942,2943,2944,2947],{},"Q：浅拷贝会复制对象里的函数吗？",[2945,2946],"br",{},"\nA：浅拷贝会复制函数的引用，函数本身不会被复制，引用还是同一个。",[1531,2949,2950,2951,2953,2954,2956],{},"Q：为什么用 ",[1556,2952,2930],{}," 不能深拷贝函数？",[2945,2955],{},"\nA：因为 JSON 格式不支持函数类型，序列化时会被忽略。",[1531,2958,2959,2960,2962],{},"Q：有没有简单方法检测对象是否有循环引用？",[2945,2961],{},"\nA：可以借助 WeakSet 来检测遍历过程中是否访问过某个对象，避免死循环。",[1535,2964],{},[1526,2966,2968],{"id":2967},"小练习","🧪 小练习",[1531,2970,2971,2972,2974],{},"练习 1：请使用 ",[1556,2973,2084],{}," 实现一个简单的浅拷贝函数，并测试修改值类型和引用类型属性对原对象的影响。",[1549,2976,2978],{"className":1551,"code":2977,"language":1553,"meta":1554,"style":1554},"function shallowCopy(obj) {\n    // 请在这里实现代码\n}\n\nvar original = { name: '小明', hobby: ['篮球', '足球'] };\nvar copy = shallowCopy(original);\ncopy.name = '小红';\ncopy.hobby.push('游泳');\n\nconsole.log(original.name); // ?\nconsole.log(original.hobby); // ?\n",[1556,2979,2980,2995,3000,3004,3008,3056,3071,3089,3113,3117,3137],{"__ignoreMap":1554},[1559,2981,2982,2984,2987,2989,2991,2993],{"class":1561,"line":1562},[1559,2983,2377],{"class":1565},[1559,2985,2986],{"class":1919}," shallowCopy",[1559,2988,1923],{"class":1573},[1559,2990,2386],{"class":2385},[1559,2992,1980],{"class":1573},[1559,2994,1846],{"class":1573},[1559,2996,2997],{"class":1561,"line":1590},[1559,2998,2999],{"class":2014},"    // 请在这里实现代码\n",[1559,3001,3002],{"class":1561,"line":1609},[1559,3003,2598],{"class":1573},[1559,3005,3006],{"class":1561,"line":1897},[1559,3007,1989],{"emptyLinePlaceholder":1988},[1559,3009,3010,3012,3015,3017,3019,3021,3023,3025,3027,3029,3031,3034,3036,3038,3040,3042,3044,3046,3048,3050,3052,3054],{"class":1561,"line":1903},[1559,3011,1566],{"class":1565},[1559,3013,3014],{"class":1569}," original ",[1559,3016,1574],{"class":1573},[1559,3018,1696],{"class":1573},[1559,3020,1700],{"class":1699},[1559,3022,1703],{"class":1573},[1559,3024,1577],{"class":1573},[1559,3026,1858],{"class":1580},[1559,3028,1584],{"class":1573},[1559,3030,1712],{"class":1573},[1559,3032,3033],{"class":1699}," hobby",[1559,3035,1703],{"class":1573},[1559,3037,1873],{"class":1569},[1559,3039,1584],{"class":1573},[1559,3041,1878],{"class":1580},[1559,3043,1584],{"class":1573},[1559,3045,1712],{"class":1573},[1559,3047,1577],{"class":1573},[1559,3049,1887],{"class":1580},[1559,3051,1584],{"class":1573},[1559,3053,2549],{"class":1569},[1559,3055,1900],{"class":1573},[1559,3057,3058,3060,3062,3064,3066,3069],{"class":1561,"line":1934},[1559,3059,1566],{"class":1565},[1559,3061,2136],{"class":1569},[1559,3063,1574],{"class":1573},[1559,3065,2986],{"class":1919},[1559,3067,3068],{"class":1569},"(original)",[1559,3070,1587],{"class":1573},[1559,3072,3073,3075,3077,3079,3081,3083,3085,3087],{"class":1561,"line":1956},[1559,3074,2660],{"class":1569},[1559,3076,1916],{"class":1573},[1559,3078,1942],{"class":1569},[1559,3080,1574],{"class":1573},[1559,3082,1577],{"class":1573},[1559,3084,1949],{"class":1580},[1559,3086,1584],{"class":1573},[1559,3088,1587],{"class":1573},[1559,3090,3091,3093,3095,3097,3099,3101,3103,3105,3107,3109,3111],{"class":1561,"line":1985},[1559,3092,2660],{"class":1569},[1559,3094,1916],{"class":1573},[1559,3096,1963],{"class":1569},[1559,3098,1916],{"class":1573},[1559,3100,1968],{"class":1919},[1559,3102,1923],{"class":1569},[1559,3104,1584],{"class":1573},[1559,3106,1975],{"class":1580},[1559,3108,1584],{"class":1573},[1559,3110,1980],{"class":1569},[1559,3112,1587],{"class":1573},[1559,3114,3115],{"class":1561,"line":1992},[1559,3116,1989],{"emptyLinePlaceholder":1988},[1559,3118,3119,3121,3123,3125,3128,3130,3132,3134],{"class":1561,"line":2018},[1559,3120,1995],{"class":1569},[1559,3122,1916],{"class":1573},[1559,3124,2000],{"class":1919},[1559,3126,3127],{"class":1569},"(original",[1559,3129,1916],{"class":1573},[1559,3131,2008],{"class":1569},[1559,3133,2011],{"class":1573},[1559,3135,3136],{"class":2014}," // ?\n",[1559,3138,3139,3141,3143,3145,3147,3149,3151,3153],{"class":1561,"line":2574},[1559,3140,1995],{"class":1569},[1559,3142,1916],{"class":1573},[1559,3144,2000],{"class":1919},[1559,3146,3127],{"class":1569},[1559,3148,1916],{"class":1573},[1559,3150,2031],{"class":1569},[1559,3152,2011],{"class":1573},[1559,3154,3136],{"class":2014},[1531,3156,3157],{},"练习 2：写一个递归函数，实现深拷贝，注意避免循环引用导致死循环。写完后测试复制一个多层嵌套对象。",[1549,3159,3161],{"className":1551,"code":3160,"language":1553,"meta":1554,"style":1554},"function deepClone(obj, hash) {\n    // 请在这里实现代码\n}\n\nvar complexObj = { a: 1, b: { c: 2, d: { e: 3 } } };\nvar copy = deepClone(complexObj);\ncopy.b.d.e = 4;\n\nconsole.log(complexObj.b.d.e); // ?\nconsole.log(copy.b.d.e); // ?\n",[1556,3162,3163,3182,3186,3190,3194,3247,3262,3287,3291,3319],{"__ignoreMap":1554},[1559,3164,3165,3167,3169,3171,3173,3175,3178,3180],{"class":1561,"line":1562},[1559,3166,2377],{"class":1565},[1559,3168,2380],{"class":1919},[1559,3170,1923],{"class":1573},[1559,3172,2386],{"class":2385},[1559,3174,1712],{"class":1573},[1559,3176,3177],{"class":2385}," hash",[1559,3179,1980],{"class":1573},[1559,3181,1846],{"class":1573},[1559,3183,3184],{"class":1561,"line":1590},[1559,3185,2999],{"class":2014},[1559,3187,3188],{"class":1561,"line":1609},[1559,3189,2598],{"class":1573},[1559,3191,3192],{"class":1561,"line":1897},[1559,3193,1989],{"emptyLinePlaceholder":1988},[1559,3195,3196,3198,3201,3203,3205,3207,3209,3211,3213,3215,3217,3219,3221,3223,3225,3227,3230,3232,3234,3237,3239,3241,3243,3245],{"class":1561,"line":1903},[1559,3197,1566],{"class":1565},[1559,3199,3200],{"class":1569}," complexObj ",[1559,3202,1574],{"class":1573},[1559,3204,1696],{"class":1573},[1559,3206,1735],{"class":1699},[1559,3208,1703],{"class":1573},[1559,3210,2108],{"class":1720},[1559,3212,1712],{"class":1573},[1559,3214,1619],{"class":1699},[1559,3216,1703],{"class":1573},[1559,3218,1696],{"class":1573},[1559,3220,2119],{"class":1699},[1559,3222,1703],{"class":1573},[1559,3224,2124],{"class":1720},[1559,3226,1712],{"class":1573},[1559,3228,3229],{"class":1699}," d",[1559,3231,1703],{"class":1573},[1559,3233,1696],{"class":1573},[1559,3235,3236],{"class":1699}," 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