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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+</head>
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+<body>
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+ <div id="box">111</div>
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+ <div class="box1">222</div>
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+ <button>我是一个按钮</button>
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+ <ul>
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+ <li id="aaa">1234567</li>
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+ <li id="aaa">1234567</li>
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+ <li id="aaa">1234567</li>
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+ <li id="aaa">1234567</li>
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+ <li id="aaa">1234567</li>
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+ <li id="aaa">1234567</li>
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+ <li id="aaa">1234567</li>
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+ </ul>
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+ <h3 class="hh">我的</h3>
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+ <span></span>
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+
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+ 元素
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+ getElementById
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+ querySelector
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+ 数组(伪数组)
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+ getElementsByClassName
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+ getElementsByTagName
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+ querySelectorAll
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+ -->
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+ <script>
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+ // 1.获取id选择器 document.getElementById
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+ var box = document.getElementById("box");
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+ console.log(box)
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+ // 2.获取类选择器 document.getElementsByClassName
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+ var box1 = document.getElementsByClassName("box1");
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+ console.log(box1[0].innerText,'类');
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+ // 3.获取标签选择器 document.getElementsByTagName
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+ var btn = document.getElementsByTagName("button");
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+ console.log(btn);
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+ // 4.通过css样式选择器获取全部标签 document.querySelectorAll
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+ var lis = document.querySelectorAll("ul li");
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+ console.log(lis);
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+ // 5.通过css样式选择器获取当前标签 document.querySelector
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+ var h3 = document.querySelector(".hh");
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+ console.log(h3);
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+ var span = document.querySelector("span");
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+ // var span = document.getElementsByTagName("span");
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+ console.log(span)
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+ span.innerText = '啊哈哈哈'
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+ // innerHTML innerText 区别
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+ </script>
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+</body>
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+</html>
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