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来找到它。",[1530,1575,1576],{},"示例：",[1578,1579,1584],"pre",{"className":1580,"code":1581,"language":1582,"meta":1583,"style":1583},"language-html shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u003Cdiv id=\"greeting\">你好，世界！\u003C/div>\n","html","",[1570,1585,1586],{"__ignoreMap":1583},[1587,1588,1591,1595,1599,1603,1606,1609,1613,1615,1618,1622,1625,1627],"span",{"class":1589,"line":1590},"line",1,[1587,1592,1594],{"class":1593},"s86vT","\u003C",[1587,1596,1598],{"class":1597},"sd2Uz","div",[1587,1600,1602],{"class":1601},"s50WR"," id",[1587,1604,1605],{"class":1593},"=",[1587,1607,1608],{"class":1593},"\"",[1587,1610,1612],{"class":1611},"sIEYB","greeting",[1587,1614,1608],{"class":1593},[1587,1616,1617],{"class":1593},">",[1587,1619,1621],{"class":1620},"sndM8","你好，世界！",[1587,1623,1624],{"class":1593},"\u003C/",[1587,1626,1598],{"class":1597},[1587,1628,1629],{"class":1593},">\n",[1530,1631,1632],{},"JavaScript：",[1578,1634,1638],{"className":1635,"code":1636,"language":1637,"meta":1583,"style":1583},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","var greet = document.getElementById('greeting');\n","js",[1570,1639,1640],{"__ignoreMap":1583},[1587,1641,1642,1645,1648,1650,1653,1656,1660,1663,1666,1668,1670,1673],{"class":1589,"line":1590},[1587,1643,1644],{"class":1601},"var",[1587,1646,1647],{"class":1620}," greet ",[1587,1649,1605],{"class":1593},[1587,1651,1652],{"class":1620}," document",[1587,1654,1655],{"class":1593},".",[1587,1657,1659],{"class":1658},"swgpB","getElementById",[1587,1661,1662],{"class":1620},"(",[1587,1664,1665],{"class":1593},"'",[1587,1667,1612],{"class":1611},[1587,1669,1665],{"class":1593},[1587,1671,1672],{"class":1620},")",[1587,1674,1675],{"class":1593},";\n",[1562,1677,1679],{"id":1678},"_2-根据标签名找元素","2. 根据标签名找元素",[1530,1681,1682,1683,1686],{},"所有的某种标签元素都会被选中，比如所有的 ",[1570,1684,1685],{},"\u003Cp>"," 标签。",[1578,1688,1690],{"className":1635,"code":1689,"language":1637,"meta":1583,"style":1583},"var paragraphs = document.getElementsByTagName('p');\n",[1570,1691,1692],{"__ignoreMap":1583},[1587,1693,1694,1696,1699,1701,1703,1705,1708,1710,1712,1714,1716,1718],{"class":1589,"line":1590},[1587,1695,1644],{"class":1601},[1587,1697,1698],{"class":1620}," paragraphs ",[1587,1700,1605],{"class":1593},[1587,1702,1652],{"class":1620},[1587,1704,1655],{"class":1593},[1587,1706,1707],{"class":1658},"getElementsByTagName",[1587,1709,1662],{"class":1620},[1587,1711,1665],{"class":1593},[1587,1713,1530],{"class":1611},[1587,1715,1665],{"class":1593},[1587,1717,1672],{"class":1620},[1587,1719,1675],{"class":1593},[1530,1721,1722],{},"这里返回的是一个列表，要用索引取具体某个元素。",[1562,1724,1726],{"id":1725},"_3-根据类名找元素","3. 根据类名找元素",[1530,1728,1729],{},"网页上相同功能或样式往往会被赋予同一个类名。",[1578,1731,1733],{"className":1635,"code":1732,"language":1637,"meta":1583,"style":1583},"var items = document.getElementsByClassName('item');\n",[1570,1734,1735],{"__ignoreMap":1583},[1587,1736,1737,1739,1742,1744,1746,1748,1751,1753,1755,1758,1760,1762],{"class":1589,"line":1590},[1587,1738,1644],{"class":1601},[1587,1740,1741],{"class":1620}," items ",[1587,1743,1605],{"class":1593},[1587,1745,1652],{"class":1620},[1587,1747,1655],{"class":1593},[1587,1749,1750],{"class":1658},"getElementsByClassName",[1587,1752,1662],{"class":1620},[1587,1754,1665],{"class":1593},[1587,1756,1757],{"class":1611},"item",[1587,1759,1665],{"class":1593},[1587,1761,1672],{"class":1620},[1587,1763,1675],{"class":1593},[1562,1765,1767],{"id":1766},"_4-使用通用选择器css-选择器","4. 使用通用选择器（CSS 选择器）",[1530,1769,1770],{},"这个方法比较灵活，可以根据标签、类、id、层级结构来选元素。",[1578,1772,1774],{"className":1635,"code":1773,"language":1637,"meta":1583,"style":1583},"var firstItem = document.querySelector('.item');\nvar allItems = document.querySelectorAll('.item');\n",[1570,1775,1776,1805],{"__ignoreMap":1583},[1587,1777,1778,1780,1783,1785,1787,1789,1792,1794,1796,1799,1801,1803],{"class":1589,"line":1590},[1587,1779,1644],{"class":1601},[1587,1781,1782],{"class":1620}," firstItem ",[1587,1784,1605],{"class":1593},[1587,1786,1652],{"class":1620},[1587,1788,1655],{"class":1593},[1587,1790,1791],{"class":1658},"querySelector",[1587,1793,1662],{"class":1620},[1587,1795,1665],{"class":1593},[1587,1797,1798],{"class":1611},".item",[1587,1800,1665],{"class":1593},[1587,1802,1672],{"class":1620},[1587,1804,1675],{"class":1593},[1587,1806,1808,1810,1813,1815,1817,1819,1822,1824,1826,1828,1830,1832],{"class":1589,"line":1807},2,[1587,1809,1644],{"class":1601},[1587,1811,1812],{"class":1620}," allItems ",[1587,1814,1605],{"class":1593},[1587,1816,1652],{"class":1620},[1587,1818,1655],{"class":1593},[1587,1820,1821],{"class":1658},"querySelectorAll",[1587,1823,1662],{"class":1620},[1587,1825,1665],{"class":1593},[1587,1827,1798],{"class":1611},[1587,1829,1665],{"class":1593},[1587,1831,1672],{"class":1620},[1587,1833,1675],{"class":1593},[1547,1835,1836],{},[1530,1837,1838,1840,1841,1843],{},[1570,1839,1791],{}," 只返回匹配的第一个元素，",[1570,1842,1821],{}," 返回所有匹配的元素列表。",[1534,1845],{},[1525,1847,1849],{"id":1848},"️-如何修改-dom-节点内容","✏️ 如何修改 DOM 节点内容？",[1530,1851,1852],{},"拿到元素后，最常用的操作就是改它里面的文字或者 HTML 结构。",[1562,1854,1855],{"id":1855},"修改文字内容",[1530,1857,1858,1859,1862,1863,1866],{},"用 ",[1570,1860,1861],{},"innerText"," 或 ",[1570,1864,1865],{},"textContent"," 属性可以修改元素的文本。",[1578,1868,1870],{"className":1635,"code":1869,"language":1637,"meta":1583,"style":1583},"var greet = document.getElementById('greeting');\ngreet.innerText = '你好，前端小白！';\n",[1570,1871,1872,1898],{"__ignoreMap":1583},[1587,1873,1874,1876,1878,1880,1882,1884,1886,1888,1890,1892,1894,1896],{"class":1589,"line":1590},[1587,1875,1644],{"class":1601},[1587,1877,1647],{"class":1620},[1587,1879,1605],{"class":1593},[1587,1881,1652],{"class":1620},[1587,1883,1655],{"class":1593},[1587,1885,1659],{"class":1658},[1587,1887,1662],{"class":1620},[1587,1889,1665],{"class":1593},[1587,1891,1612],{"class":1611},[1587,1893,1665],{"class":1593},[1587,1895,1672],{"class":1620},[1587,1897,1675],{"class":1593},[1587,1899,1900,1903,1905,1908,1910,1913,1916,1918],{"class":1589,"line":1807},[1587,1901,1902],{"class":1620},"greet",[1587,1904,1655],{"class":1593},[1587,1906,1907],{"class":1620},"innerText ",[1587,1909,1605],{"class":1593},[1587,1911,1912],{"class":1593}," '",[1587,1914,1915],{"class":1611},"你好，前端小白！",[1587,1917,1665],{"class":1593},[1587,1919,1675],{"class":1593},[1562,1921,1923],{"id":1922},"修改-html-内容","修改 HTML 内容",[1530,1925,1926,1927,1930],{},"如果想改成带标签的内容，用 ",[1570,1928,1929],{},"innerHTML","。",[1578,1932,1934],{"className":1635,"code":1933,"language":1637,"meta":1583,"style":1583},"greet.innerHTML = '\u003Cstrong>你好，前端小白！\u003C/strong>';\n",[1570,1935,1936],{"__ignoreMap":1583},[1587,1937,1938,1940,1942,1945,1947,1949,1952,1954],{"class":1589,"line":1590},[1587,1939,1902],{"class":1620},[1587,1941,1655],{"class":1593},[1587,1943,1944],{"class":1620},"innerHTML ",[1587,1946,1605],{"class":1593},[1587,1948,1912],{"class":1593},[1587,1950,1951],{"class":1611},"\u003Cstrong>你好，前端小白！\u003C/strong>",[1587,1953,1665],{"class":1593},[1587,1955,1675],{"class":1593},[1957,1958,1959],"warning",{},[1530,1960,1961,1962,1964],{},"当用 ",[1570,1963,1929],{}," 替换内容时，会重新解析 HTML，可能会导致之前绑定的事件失效。",[1534,1966],{},[1525,1968,1970],{"id":1969},"动态增删元素网页更灵活","➕ 动态增删元素，网页更灵活",[1530,1972,1973],{},"不仅改内容，有时候你想让网页新增或删除内容，这就需要操作元素节点。",[1562,1975,1977],{"id":1976},"_1-创建新元素","1. 创建新元素",[1530,1979,1858,1980,1983],{},[1570,1981,1982],{},"document.createElement('标签名')"," 来新建元素。",[1578,1985,1987],{"className":1635,"code":1986,"language":1637,"meta":1583,"style":1583},"var newDiv = document.createElement('div');\nnewDiv.innerText = '我是新加的内容';\n",[1570,1988,1989,2017],{"__ignoreMap":1583},[1587,1990,1991,1993,1996,1998,2000,2002,2005,2007,2009,2011,2013,2015],{"class":1589,"line":1590},[1587,1992,1644],{"class":1601},[1587,1994,1995],{"class":1620}," newDiv ",[1587,1997,1605],{"class":1593},[1587,1999,1652],{"class":1620},[1587,2001,1655],{"class":1593},[1587,2003,2004],{"class":1658},"createElement",[1587,2006,1662],{"class":1620},[1587,2008,1665],{"class":1593},[1587,2010,1598],{"class":1611},[1587,2012,1665],{"class":1593},[1587,2014,1672],{"class":1620},[1587,2016,1675],{"class":1593},[1587,2018,2019,2022,2024,2026,2028,2030,2033,2035],{"class":1589,"line":1807},[1587,2020,2021],{"class":1620},"newDiv",[1587,2023,1655],{"class":1593},[1587,2025,1907],{"class":1620},[1587,2027,1605],{"class":1593},[1587,2029,1912],{"class":1593},[1587,2031,2032],{"class":1611},"我是新加的内容",[1587,2034,1665],{"class":1593},[1587,2036,1675],{"class":1593},[1562,2038,2040],{"id":2039},"_2-添加元素到页面","2. 添加元素到页面",[1530,2042,2043,2044,2047],{},"用父元素的 ",[1570,2045,2046],{},"appendChild"," 方法。",[1578,2049,2051],{"className":1635,"code":2050,"language":1637,"meta":1583,"style":1583},"var container = document.getElementById('container');\ncontainer.appendChild(newDiv);\n",[1570,2052,2053,2081],{"__ignoreMap":1583},[1587,2054,2055,2057,2060,2062,2064,2066,2068,2070,2072,2075,2077,2079],{"class":1589,"line":1590},[1587,2056,1644],{"class":1601},[1587,2058,2059],{"class":1620}," container ",[1587,2061,1605],{"class":1593},[1587,2063,1652],{"class":1620},[1587,2065,1655],{"class":1593},[1587,2067,1659],{"class":1658},[1587,2069,1662],{"class":1620},[1587,2071,1665],{"class":1593},[1587,2073,2074],{"class":1611},"container",[1587,2076,1665],{"class":1593},[1587,2078,1672],{"class":1620},[1587,2080,1675],{"class":1593},[1587,2082,2083,2085,2087,2089,2092],{"class":1589,"line":1807},[1587,2084,2074],{"class":1620},[1587,2086,1655],{"class":1593},[1587,2088,2046],{"class":1658},[1587,2090,2091],{"class":1620},"(newDiv)",[1587,2093,1675],{"class":1593},[1530,2095,2096],{},"这样新元素就加到容器的末尾了。",[1562,2098,2100],{"id":2099},"_3-删除元素","3. 删除元素",[1530,2102,2043,2103,2047],{},[1570,2104,2105],{},"removeChild",[1578,2107,2109],{"className":1635,"code":2108,"language":1637,"meta":1583,"style":1583},"container.removeChild(newDiv);\n",[1570,2110,2111],{"__ignoreMap":1583},[1587,2112,2113,2115,2117,2119,2121],{"class":1589,"line":1590},[1587,2114,2074],{"class":1620},[1587,2116,1655],{"class":1593},[1587,2118,2105],{"class":1658},[1587,2120,2091],{"class":1620},[1587,2122,1675],{"class":1593},[1562,2124,2126],{"id":2125},"_4-替换元素","4. 替换元素",[1530,2128,2043,2129,2047],{},[1570,2130,2131],{},"replaceChild",[1578,2133,2135],{"className":1635,"code":2134,"language":1637,"meta":1583,"style":1583},"var anotherDiv = document.createElement('div');\nanotherDiv.innerText = '替换内容';\ncontainer.replaceChild(anotherDiv, newDiv);\n",[1570,2136,2137,2164,2184],{"__ignoreMap":1583},[1587,2138,2139,2141,2144,2146,2148,2150,2152,2154,2156,2158,2160,2162],{"class":1589,"line":1590},[1587,2140,1644],{"class":1601},[1587,2142,2143],{"class":1620}," anotherDiv ",[1587,2145,1605],{"class":1593},[1587,2147,1652],{"class":1620},[1587,2149,1655],{"class":1593},[1587,2151,2004],{"class":1658},[1587,2153,1662],{"class":1620},[1587,2155,1665],{"class":1593},[1587,2157,1598],{"class":1611},[1587,2159,1665],{"class":1593},[1587,2161,1672],{"class":1620},[1587,2163,1675],{"class":1593},[1587,2165,2166,2169,2171,2173,2175,2177,2180,2182],{"class":1589,"line":1807},[1587,2167,2168],{"class":1620},"anotherDiv",[1587,2170,1655],{"class":1593},[1587,2172,1907],{"class":1620},[1587,2174,1605],{"class":1593},[1587,2176,1912],{"class":1593},[1587,2178,2179],{"class":1611},"替换内容",[1587,2181,1665],{"class":1593},[1587,2183,1675],{"class":1593},[1587,2185,2187,2189,2191,2193,2196,2199,2202],{"class":1589,"line":2186},3,[1587,2188,2074],{"class":1620},[1587,2190,1655],{"class":1593},[1587,2192,2131],{"class":1658},[1587,2194,2195],{"class":1620},"(anotherDiv",[1587,2197,2198],{"class":1593},",",[1587,2200,2201],{"class":1620}," newDiv)",[1587,2203,1675],{"class":1593},[1534,2205],{},[1525,2207,2209],{"id":2208},"修改元素样式","🎨 修改元素样式",[1530,2211,2212],{},"网页好看很重要，样式就是网页的衣服。DOM 操作还能修改元素的样式。",[1562,2214,2216],{"id":2215},"_1-直接修改-style-属性","1. 直接修改 style 属性",[1578,2218,2220],{"className":1635,"code":2219,"language":1637,"meta":1583,"style":1583},"var box = document.getElementById('box');\nbox.style.backgroundColor = 'lightblue';\nbox.style.width = '200px';\nbox.style.height = '100px';\n",[1570,2221,2222,2250,2275,2299],{"__ignoreMap":1583},[1587,2223,2224,2226,2229,2231,2233,2235,2237,2239,2241,2244,2246,2248],{"class":1589,"line":1590},[1587,2225,1644],{"class":1601},[1587,2227,2228],{"class":1620}," box ",[1587,2230,1605],{"class":1593},[1587,2232,1652],{"class":1620},[1587,2234,1655],{"class":1593},[1587,2236,1659],{"class":1658},[1587,2238,1662],{"class":1620},[1587,2240,1665],{"class":1593},[1587,2242,2243],{"class":1611},"box",[1587,2245,1665],{"class":1593},[1587,2247,1672],{"class":1620},[1587,2249,1675],{"class":1593},[1587,2251,2252,2254,2256,2259,2261,2264,2266,2268,2271,2273],{"class":1589,"line":1807},[1587,2253,2243],{"class":1620},[1587,2255,1655],{"class":1593},[1587,2257,2258],{"class":1620},"style",[1587,2260,1655],{"class":1593},[1587,2262,2263],{"class":1620},"backgroundColor ",[1587,2265,1605],{"class":1593},[1587,2267,1912],{"class":1593},[1587,2269,2270],{"class":1611},"lightblue",[1587,2272,1665],{"class":1593},[1587,2274,1675],{"class":1593},[1587,2276,2277,2279,2281,2283,2285,2288,2290,2292,2295,2297],{"class":1589,"line":2186},[1587,2278,2243],{"class":1620},[1587,2280,1655],{"class":1593},[1587,2282,2258],{"class":1620},[1587,2284,1655],{"class":1593},[1587,2286,2287],{"class":1620},"width ",[1587,2289,1605],{"class":1593},[1587,2291,1912],{"class":1593},[1587,2293,2294],{"class":1611},"200px",[1587,2296,1665],{"class":1593},[1587,2298,1675],{"class":1593},[1587,2300,2302,2304,2306,2308,2310,2313,2315,2317,2320,2322],{"class":1589,"line":2301},4,[1587,2303,2243],{"class":1620},[1587,2305,1655],{"class":1593},[1587,2307,2258],{"class":1620},[1587,2309,1655],{"class":1593},[1587,2311,2312],{"class":1620},"height ",[1587,2314,1605],{"class":1593},[1587,2316,1912],{"class":1593},[1587,2318,2319],{"class":1611},"100px",[1587,2321,1665],{"class":1593},[1587,2323,1675],{"class":1593},[1562,2325,2327],{"id":2326},"_2-增删类名控制样式","2. 增删类名控制样式",[1530,2329,2330,2331,1862,2334,2337],{},"通过 ",[1570,2332,2333],{},"className",[1570,2335,2336],{},"classList"," 来添加/删除类名。",[1578,2339,2341],{"className":1635,"code":2340,"language":1637,"meta":1583,"style":1583},"box.classList.add('active');\nbox.classList.remove('active');\n",[1570,2342,2343,2369],{"__ignoreMap":1583},[1587,2344,2345,2347,2349,2351,2353,2356,2358,2360,2363,2365,2367],{"class":1589,"line":1590},[1587,2346,2243],{"class":1620},[1587,2348,1655],{"class":1593},[1587,2350,2336],{"class":1620},[1587,2352,1655],{"class":1593},[1587,2354,2355],{"class":1658},"add",[1587,2357,1662],{"class":1620},[1587,2359,1665],{"class":1593},[1587,2361,2362],{"class":1611},"active",[1587,2364,1665],{"class":1593},[1587,2366,1672],{"class":1620},[1587,2368,1675],{"class":1593},[1587,2370,2371,2373,2375,2377,2379,2382,2384,2386,2388,2390,2392],{"class":1589,"line":1807},[1587,2372,2243],{"class":1620},[1587,2374,1655],{"class":1593},[1587,2376,2336],{"class":1620},[1587,2378,1655],{"class":1593},[1587,2380,2381],{"class":1658},"remove",[1587,2383,1662],{"class":1620},[1587,2385,1665],{"class":1593},[1587,2387,2362],{"class":1611},[1587,2389,1665],{"class":1593},[1587,2391,1672],{"class":1620},[1587,2393,1675],{"class":1593},[1547,2395,2396],{},[1530,2397,2398],{},"用类名管理样式更好，因为样式都写在 CSS 里，方便维护。",[1534,2400],{},[1525,2402,2404],{"id":2403},"事件与-dom-操作结合打造互动网页","💡 事件与 DOM 操作结合，打造互动网页",[1530,2406,2407],{},"DOM 操作常和事件一起用，比如点击按钮，内容发生变化。",[1530,2409,2410],{},"示例：点击按钮显示隐藏文字",[1578,2412,2414],{"className":1580,"code":2413,"language":1582,"meta":1583,"style":1583},"\u003Cbutton id=\"btn\">点击切换显示\u003C/button>\n\u003Cdiv id=\"text\">这段文字可以隐藏或显示\u003C/div>\n",[1570,2415,2416,2445],{"__ignoreMap":1583},[1587,2417,2418,2420,2423,2425,2427,2429,2432,2434,2436,2439,2441,2443],{"class":1589,"line":1590},[1587,2419,1594],{"class":1593},[1587,2421,2422],{"class":1597},"button",[1587,2424,1602],{"class":1601},[1587,2426,1605],{"class":1593},[1587,2428,1608],{"class":1593},[1587,2430,2431],{"class":1611},"btn",[1587,2433,1608],{"class":1593},[1587,2435,1617],{"class":1593},[1587,2437,2438],{"class":1620},"点击切换显示",[1587,2440,1624],{"class":1593},[1587,2442,2422],{"class":1597},[1587,2444,1629],{"class":1593},[1587,2446,2447,2449,2451,2453,2455,2457,2460,2462,2464,2467,2469,2471],{"class":1589,"line":1807},[1587,2448,1594],{"class":1593},[1587,2450,1598],{"class":1597},[1587,2452,1602],{"class":1601},[1587,2454,1605],{"class":1593},[1587,2456,1608],{"class":1593},[1587,2458,2459],{"class":1611},"text",[1587,2461,1608],{"class":1593},[1587,2463,1617],{"class":1593},[1587,2465,2466],{"class":1620},"这段文字可以隐藏或显示",[1587,2468,1624],{"class":1593},[1587,2470,1598],{"class":1597},[1587,2472,1629],{"class":1593},[1530,2474,1632],{},[1578,2476,2478],{"className":1635,"code":2477,"language":1637,"meta":1583,"style":1583},"var btn = document.getElementById('btn');\nvar text = document.getElementById('text');\n\nbtn.onclick = function () {\n    if (text.style.display === 'none') {\n        text.style.display = 'block';\n    } else {\n        text.style.display = 'none';\n    }\n};\n",[1570,2479,2480,2507,2534,2540,2561,2598,2623,2634,2657,2663],{"__ignoreMap":1583},[1587,2481,2482,2484,2487,2489,2491,2493,2495,2497,2499,2501,2503,2505],{"class":1589,"line":1590},[1587,2483,1644],{"class":1601},[1587,2485,2486],{"class":1620}," btn ",[1587,2488,1605],{"class":1593},[1587,2490,1652],{"class":1620},[1587,2492,1655],{"class":1593},[1587,2494,1659],{"class":1658},[1587,2496,1662],{"class":1620},[1587,2498,1665],{"class":1593},[1587,2500,2431],{"class":1611},[1587,2502,1665],{"class":1593},[1587,2504,1672],{"class":1620},[1587,2506,1675],{"class":1593},[1587,2508,2509,2511,2514,2516,2518,2520,2522,2524,2526,2528,2530,2532],{"class":1589,"line":1807},[1587,2510,1644],{"class":1601},[1587,2512,2513],{"class":1620}," text ",[1587,2515,1605],{"class":1593},[1587,2517,1652],{"class":1620},[1587,2519,1655],{"class":1593},[1587,2521,1659],{"class":1658},[1587,2523,1662],{"class":1620},[1587,2525,1665],{"class":1593},[1587,2527,2459],{"class":1611},[1587,2529,1665],{"class":1593},[1587,2531,1672],{"class":1620},[1587,2533,1675],{"class":1593},[1587,2535,2536],{"class":1589,"line":2186},[1587,2537,2539],{"emptyLinePlaceholder":2538},true,"\n",[1587,2541,2542,2544,2546,2549,2552,2555,2558],{"class":1589,"line":2301},[1587,2543,2431],{"class":1620},[1587,2545,1655],{"class":1593},[1587,2547,2548],{"class":1658},"onclick",[1587,2550,2551],{"class":1593}," =",[1587,2553,2554],{"class":1601}," function",[1587,2556,2557],{"class":1593}," ()",[1587,2559,2560],{"class":1593}," {\n",[1587,2562,2564,2568,2571,2573,2575,2577,2579,2582,2585,2587,2590,2592,2595],{"class":1589,"line":2563},5,[1587,2565,2567],{"class":2566},"s8pZq","    if",[1587,2569,2570],{"class":1597}," (",[1587,2572,2459],{"class":1620},[1587,2574,1655],{"class":1593},[1587,2576,2258],{"class":1620},[1587,2578,1655],{"class":1593},[1587,2580,2581],{"class":1620},"display",[1587,2583,2584],{"class":1593}," ===",[1587,2586,1912],{"class":1593},[1587,2588,2589],{"class":1611},"none",[1587,2591,1665],{"class":1593},[1587,2593,2594],{"class":1597},") ",[1587,2596,2597],{"class":1593},"{\n",[1587,2599,2601,2604,2606,2608,2610,2612,2614,2616,2619,2621],{"class":1589,"line":2600},6,[1587,2602,2603],{"class":1620},"        text",[1587,2605,1655],{"class":1593},[1587,2607,2258],{"class":1620},[1587,2609,1655],{"class":1593},[1587,2611,2581],{"class":1620},[1587,2613,2551],{"class":1593},[1587,2615,1912],{"class":1593},[1587,2617,2618],{"class":1611},"block",[1587,2620,1665],{"class":1593},[1587,2622,1675],{"class":1593},[1587,2624,2626,2629,2632],{"class":1589,"line":2625},7,[1587,2627,2628],{"class":1593},"    }",[1587,2630,2631],{"class":2566}," else",[1587,2633,2560],{"class":1593},[1587,2635,2637,2639,2641,2643,2645,2647,2649,2651,2653,2655],{"class":1589,"line":2636},8,[1587,2638,2603],{"class":1620},[1587,2640,1655],{"class":1593},[1587,2642,2258],{"class":1620},[1587,2644,1655],{"class":1593},[1587,2646,2581],{"class":1620},[1587,2648,2551],{"class":1593},[1587,2650,1912],{"class":1593},[1587,2652,2589],{"class":1611},[1587,2654,1665],{"class":1593},[1587,2656,1675],{"class":1593},[1587,2658,2660],{"class":1589,"line":2659},9,[1587,2661,2662],{"class":1593},"    }\n",[1587,2664,2666],{"class":1589,"line":2665},10,[1587,2667,2668],{"class":1593},"};\n",[1547,2670,2671],{},[1530,2672,2673,2674,2676],{},"这里的 ",[1570,2675,2548],{}," 是给按钮绑定点击事件，每次点击都执行里面的函数。",[1534,2678],{},[1525,2680,2682],{"id":2681},"小节总结","🧾 小节总结",[2684,2685,2686,2690,2693],"ul",{},[2687,2688,2689],"li",{},"DOM 是网页的结构树，JavaScript 可以操作它实现网页动态效果。",[2687,2691,2692],{},"常用选元素的方法有：根据 id、标签名、类名、CSS 选择器。",[2687,2694,2695],{},"可以修改节点内容、添加/删除/替换元素，调整样式，绑定事件让网页动起来。",[1534,2697],{},[1525,2699,2701],{"id":2700},"知识问答qa","❓ 知识问答（Q&A）",[1530,2703,2704],{},"Q：什么是 DOM？",[1530,2706,2707],{},"A：DOM 是网页的文档对象模型，是浏览器把网页内容转成的树状结构，可以用 JavaScript 操作它来改变网页。",[1530,2709,2710],{},"Q：如何用 JavaScript 找到页面上的元素？",[1530,2712,2713,2714,2716,2717,2716,2719,2721,2722,2724,2725,1930],{},"A：可以用 ",[1570,2715,1659],{},"、",[1570,2718,1707],{},[1570,2720,1750],{},"，或者 ",[1570,2723,1791],{}," 和 ",[1570,2726,1821],{},[1530,2728,2729],{},"Q：怎么给一个元素添加新的内容？",[1530,2731,2732,2733,2735,2736,2738],{},"A：先用 ",[1570,2734,2004],{}," 创建新元素，再用 ",[1570,2737,2046],{}," 加到页面上的父元素里。",[1534,2740],{},[1525,2742,2744],{"id":2743},"小练习","🧪 小练习",[1562,2746,2748],{"id":2747},"练习1点击按钮页面上新增一个带文字的红色盒子","练习1：点击按钮，页面上新增一个带文字的红色盒子",[1578,2750,2752],{"className":1580,"code":2751,"language":1582,"meta":1583,"style":1583},"\u003Cbutton id=\"addBtn\">添加盒子\u003C/button>\n\u003Cdiv id=\"container\">\u003C/div>\n\n\u003Cstyle>\n    .red-box {\n       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};\n\u003C/script>\n",[1570,2753,2754,2782,2805,2809,2817,2828,2843,2855,2867,2879,2894,2906,2919,2924,2933,2938,2948,2977,3004,3009,3027,3034,3040],{"__ignoreMap":1583},[1587,2755,2756,2758,2760,2762,2764,2766,2769,2771,2773,2776,2778,2780],{"class":1589,"line":1590},[1587,2757,1594],{"class":1593},[1587,2759,2422],{"class":1597},[1587,2761,1602],{"class":1601},[1587,2763,1605],{"class":1593},[1587,2765,1608],{"class":1593},[1587,2767,2768],{"class":1611},"addBtn",[1587,2770,1608],{"class":1593},[1587,2772,1617],{"class":1593},[1587,2774,2775],{"class":1620},"添加盒子",[1587,2777,1624],{"class":1593},[1587,2779,2422],{"class":1597},[1587,2781,1629],{"class":1593},[1587,2783,2784,2786,2788,2790,2792,2794,2796,2798,2801,2803],{"class":1589,"line":1807},[1587,2785,1594],{"class":1593},[1587,2787,1598],{"class":1597},[1587,2789,1602],{"class":1601},[1587,2791,1605],{"class":1593},[1587,2793,1608],{"class":1593},[1587,2795,2074],{"class":1611},[1587,2797,1608],{"class":1593},[1587,2799,2800],{"class":1593},">\u003C/",[1587,2802,1598],{"class":1597},[1587,2804,1629],{"class":1593},[1587,2806,2807],{"class":1589,"line":2186},[1587,2808,2539],{"emptyLinePlaceholder":2538},[1587,2810,2811,2813,2815],{"class":1589,"line":2301},[1587,2812,1594],{"class":1593},[1587,2814,2258],{"class":1597},[1587,2816,1629],{"class":1593},[1587,2818,2819,2822,2826],{"class":1589,"line":2563},[1587,2820,2821],{"class":1593},"    .",[1587,2823,2825],{"class":2824},"sYGMc","red-box",[1587,2827,2560],{"class":1593},[1587,2829,2830,2834,2837,2841],{"class":1589,"line":2600},[1587,2831,2833],{"class":2832},"sug0G","        width",[1587,2835,2836],{"class":1593},":",[1587,2838,2840],{"class":2839},"smPcV"," 100px",[1587,2842,1675],{"class":1593},[1587,2844,2845,2848,2850,2853],{"class":1589,"line":2625},[1587,2846,2847],{"class":2832},"        height",[1587,2849,2836],{"class":1593},[1587,2851,2852],{"class":2839}," 50px",[1587,2854,1675],{"class":1593},[1587,2856,2857,2860,2862,2865],{"class":1589,"line":2636},[1587,2858,2859],{"class":2832},"        background-color",[1587,2861,2836],{"class":1593},[1587,2863,2864],{"class":1620}," red",[1587,2866,1675],{"class":1593},[1587,2868,2869,2872,2874,2877],{"class":1589,"line":2659},[1587,2870,2871],{"class":2832},"        color",[1587,2873,2836],{"class":1593},[1587,2875,2876],{"class":1620}," white",[1587,2878,1675],{"class":1593},[1587,2880,2881,2884,2886,2889,2892],{"class":1589,"line":2665},[1587,2882,2883],{"class":2832},"        margin",[1587,2885,2836],{"class":1593},[1587,2887,2888],{"class":2839}," 5px",[1587,2890,2891],{"class":2839}," 0",[1587,2893,1675],{"class":1593},[1587,2895,2897,2900,2902,2904],{"class":1589,"line":2896},11,[1587,2898,2899],{"class":2832},"        line-height",[1587,2901,2836],{"class":1593},[1587,2903,2852],{"class":2839},[1587,2905,1675],{"class":1593},[1587,2907,2909,2912,2914,2917],{"class":1589,"line":2908},12,[1587,2910,2911],{"class":2832},"        text-align",[1587,2913,2836],{"class":1593},[1587,2915,2916],{"class":1620}," center",[1587,2918,1675],{"class":1593},[1587,2920,2922],{"class":1589,"line":2921},13,[1587,2923,2662],{"class":1593},[1587,2925,2927,2929,2931],{"class":1589,"line":2926},14,[1587,2928,1624],{"class":1593},[1587,2930,2258],{"class":1597},[1587,2932,1629],{"class":1593},[1587,2934,2936],{"class":1589,"line":2935},15,[1587,2937,2539],{"emptyLinePlaceholder":2538},[1587,2939,2941,2943,2946],{"class":1589,"line":2940},16,[1587,2942,1594],{"class":1593},[1587,2944,2945],{"class":1597},"script",[1587,2947,1629],{"class":1593},[1587,2949,2951,2954,2957,2959,2961,2963,2965,2967,2969,2971,2973,2975],{"class":1589,"line":2950},17,[1587,2952,2953],{"class":1601},"    var",[1587,2955,2956],{"class":1620}," addBtn ",[1587,2958,1605],{"class":1593},[1587,2960,1652],{"class":1620},[1587,2962,1655],{"class":1593},[1587,2964,1659],{"class":1658},[1587,2966,1662],{"class":1620},[1587,2968,1665],{"class":1593},[1587,2970,2768],{"class":1611},[1587,2972,1665],{"class":1593},[1587,2974,1672],{"class":1620},[1587,2976,1675],{"class":1593},[1587,2978,2980,2982,2984,2986,2988,2990,2992,2994,2996,2998,3000,3002],{"class":1589,"line":2979},18,[1587,2981,2953],{"class":1601},[1587,2983,2059],{"class":1620},[1587,2985,1605],{"class":1593},[1587,2987,1652],{"class":1620},[1587,2989,1655],{"class":1593},[1587,2991,1659],{"class":1658},[1587,2993,1662],{"class":1620},[1587,2995,1665],{"class":1593},[1587,2997,2074],{"class":1611},[1587,2999,1665],{"class":1593},[1587,3001,1672],{"class":1620},[1587,3003,1675],{"class":1593},[1587,3005,3007],{"class":1589,"line":3006},19,[1587,3008,2539],{"emptyLinePlaceholder":2538},[1587,3010,3012,3015,3017,3019,3021,3023,3025],{"class":1589,"line":3011},20,[1587,3013,3014],{"class":1620},"    addBtn",[1587,3016,1655],{"class":1593},[1587,3018,2548],{"class":1658},[1587,3020,2551],{"class":1593},[1587,3022,2554],{"class":1601},[1587,3024,2557],{"class":1593},[1587,3026,2560],{"class":1593},[1587,3028,3030],{"class":1589,"line":3029},21,[1587,3031,3033],{"class":3032},"syuKq","        // 在这里写代码，创建新盒子并添加到container里\n",[1587,3035,3037],{"class":1589,"line":3036},22,[1587,3038,3039],{"class":1593},"    };\n",[1587,3041,3043,3045,3047],{"class":1589,"line":3042},23,[1587,3044,1624],{"class":1593},[1587,3046,2945],{"class":1597},[1587,3048,1629],{"class":1593},[1562,3050,3052],{"id":3051},"练习2给一个段落绑定点击事件点击改变段落的文字颜色","练习2：给一个段落绑定点击事件，点击改变段落的文字颜色",[1578,3054,3056],{"className":1580,"code":3055,"language":1582,"meta":1583,"style":1583},"\u003Cp id=\"para\">点我试试变颜色\u003C/p>\n\n\u003Cstyle>\n    .color-change {\n        color: green;\n    }\n\u003C/style>\n\n\u003Cscript>\n    var para = document.getElementById('para');\n\n    // 在这里写代码，给para绑定点击事件，点击时切换color-change类\n\u003C/script>\n",[1570,3057,3058,3086,3090,3098,3107,3118,3122,3130,3134,3142,3169,3173,3178],{"__ignoreMap":1583},[1587,3059,3060,3062,3064,3066,3068,3070,3073,3075,3077,3080,3082,3084],{"class":1589,"line":1590},[1587,3061,1594],{"class":1593},[1587,3063,1530],{"class":1597},[1587,3065,1602],{"class":1601},[1587,3067,1605],{"class":1593},[1587,3069,1608],{"class":1593},[1587,3071,3072],{"class":1611},"para",[1587,3074,1608],{"class":1593},[1587,3076,1617],{"class":1593},[1587,3078,3079],{"class":1620},"点我试试变颜色",[1587,3081,1624],{"class":1593},[1587,3083,1530],{"class":1597},[1587,3085,1629],{"class":1593},[1587,3087,3088],{"class":1589,"line":1807},[1587,3089,2539],{"emptyLinePlaceholder":2538},[1587,3091,3092,3094,3096],{"class":1589,"line":2186},[1587,3093,1594],{"class":1593},[1587,3095,2258],{"class":1597},[1587,3097,1629],{"class":1593},[1587,3099,3100,3102,3105],{"class":1589,"line":2301},[1587,3101,2821],{"class":1593},[1587,3103,3104],{"class":2824},"color-change",[1587,3106,2560],{"class":1593},[1587,3108,3109,3111,3113,3116],{"class":1589,"line":2563},[1587,3110,2871],{"class":2832},[1587,3112,2836],{"class":1593},[1587,3114,3115],{"class":1620}," green",[1587,3117,1675],{"class":1593},[1587,3119,3120],{"class":1589,"line":2600},[1587,3121,2662],{"class":1593},[1587,3123,3124,3126,3128],{"class":1589,"line":2625},[1587,3125,1624],{"class":1593},[1587,3127,2258],{"class":1597},[1587,3129,1629],{"class":1593},[1587,3131,3132],{"class":1589,"line":2636},[1587,3133,2539],{"emptyLinePlaceholder":2538},[1587,3135,3136,3138,3140],{"class":1589,"line":2659},[1587,3137,1594],{"class":1593},[1587,3139,2945],{"class":1597},[1587,3141,1629],{"class":1593},[1587,3143,3144,3146,3149,3151,3153,3155,3157,3159,3161,3163,3165,3167],{"class":1589,"line":2665},[1587,3145,2953],{"class":1601},[1587,3147,3148],{"class":1620}," para ",[1587,3150,1605],{"class":1593},[1587,3152,1652],{"class":1620},[1587,3154,1655],{"class":1593},[1587,3156,1659],{"class":1658},[1587,3158,1662],{"class":1620},[1587,3160,1665],{"class":1593},[1587,3162,3072],{"class":1611},[1587,3164,1665],{"class":1593},[1587,3166,1672],{"class":1620},[1587,3168,1675],{"class":1593},[1587,3170,3171],{"class":1589,"line":2896},[1587,3172,2539],{"emptyLinePlaceholder":2538},[1587,3174,3175],{"class":1589,"line":2908},[1587,3176,3177],{"class":3032},"    // 在这里写代码，给para绑定点击事件，点击时切换color-change类\n",[1587,3179,3180,3182,3184],{"class":1589,"line":2921},[1587,3181,1624],{"class":1593},[1587,3183,2945],{"class":1597},[1587,3185,1629],{"class":1593},[1534,3187],{},[1530,3189,3190],{},"🎉 恭喜你已经掌握 DOM 结构理解、节点选择与操作、动态修改网页内容和样式技能啦！这些是前端开发的基础，助你打造丰富多彩的网页效果。继续加油！",[2258,3192,3193],{},"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 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