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@@ -0,0 +1,91 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+
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+<head>
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+ <meta charset="UTF-8">
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+ <meta http-equiv="X-UA-Compatible" content="IE=edge">
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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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+ <style>
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+ #div1 {
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+ width: 100px;
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+ height: 100px;
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+ background: red;
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+ }
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+
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+ #div2 {
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+ width: 200px;
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+ height: 200px;
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+ background: green;
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+ }
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+
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+ .xx {
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+ background: #ccc;
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+ }
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+ </style>
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+</head>
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+
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+<body>
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+ <div id="div1">123</div>
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+ <div id="div2">456</div>
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+ <button id="btn">修改背景颜色</button>
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+ <div class="xx">333</div>
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+ <div>4444</div>
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+ <div class="xx">5555</div>
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+ <div>6666</div>
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+
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+
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+ <ul id="ul1">
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+ <li class="xx">1</li>
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+ <li>2</li>
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+ <li class="xx">3</li>
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+ <li>4</li>
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+ <li class="xx">5</li>
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+ <li>6</li>
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+ </ul>
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+ <ul id="ul2">
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+ <li class="xx">1</li>
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+ <li>2</li>
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+ <li class="xx">3</li>
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+ <li>4</li>
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+ <li class="xx">5</li>
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+ <li>6</li>
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+ </ul>
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+ <script>
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+ var div1 = document.getElementById('div1') //对象
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+ var div2 = document.getElementById('div2')
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+
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+ var xx = document.getElementsByClassName('xx') //获取的数组
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+ var btn = document.getElementById('btn')
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+
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+ var aLi = document.getElementsByTagName('li') //类数组
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+
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+ var ul2 = document.getElementById('ul2')
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+ var bLi = ul2.getElementsByTagName('li')
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+ div1.onclick = function () {
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+ // console.log(123)
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+ // console.log(div1)
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+
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+
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+ }
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+ div2.onclick = function () {
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+
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+ }
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+ console.log(xx) //类数组
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+
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+ btn.onclick = function () {
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+ for (var i = 0; i < xx.length; i++) {
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+ xx[i].style.background = 'orange'
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+ }
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+ for (var k = 0; k < aLi.length; k++) {
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+ aLi[k].style.color = 'red'
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+ }
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+ for (var x = 0; x < bLi.length; x++) {
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+ bLi[x].style.color = 'pink'
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+ }
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+ }
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+ console.log(bLi)
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+ </script>
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+</body>
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+
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+</html>
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zsydgithub