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Home > List of blog posts > 获取DOM元素常见API和遍历方法
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获取DOM元素常见API和遍历方法
          
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  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta name="viewport"
  6.           content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  7.     <meta http-equiv="X-UA-Compatible" content="ie=edge">
  8.     <title>11.7作业</title>
  9. <!--    作业内容：
  10.         1. 实例演示二个获取元素的api
  11.         2. 实例演示dom常用的遍历方法-->
  12. </head>
  13. <body>
  14. <h3>1. 实例演示二个获取元素的api</h3>
  15. <div class="list">
  16.     <li>item-1</li>
  17.     <li>item-2</li>
  18.     <li>item-3</li>
  19.     <li>item-4</li>
  20.     <li>item-5</li>
  21. </div>
  23. <h3>  2. 实例演示dom常用的遍历方法</h3>
  24. <pre>[...类数组] 转为数组
  25. forEach遍历</pre>
  27. <script>
  29.     // 获取第3个元素的文本
  30.     let list3 = document.querySelector(".list>li:nth-of-type(3)");
  31.     console.log('获取第3个元素: '+list3.textContent)
  32.     // 获取第1个元素 firstElementChild的文本
  33.     let list1 = document.querySelector('.list>li:first-child');
  34.     // textContent 获取该元素的文本
  35.     console.log('获取第1个元素: '+list1.textContent)
  36.     // 获取最后一个元素的文本
  37.     let last = document.querySelector('.list>li:last-of-type')
  38.     console.log('获取最后一个元素: '+last.textContent)
  41.     // 2. 实例演示dom常用的遍历方法
  43.     let arr = document.querySelector('.list')
  44.     // 获取所有的子节点 childNodes
  45.     // 注意：childNodes会包含空格换行等
  46.     console.log("childNodes会包含空格换行",arr.childNodes)
  47.     // 获取所有的元素节点
  48.     console.log('获取所有的元素节点',arr.children)
  49.     // 遍历
  50.     // 遍历的每个li 的颜色设置为蓝色
  51.     ;[...arr.children].forEach(function (li){li.style.color='blue'})
  53.     // 打印每个li出来
  54.     ;[...arr.children].forEach(function (li){console.log('打印遍历出来的li：',li.textContent)})
  55.     // console.log(typeof [...arr.children])
  59. </script>
  60. </body>
  61. </html>

运行结果：

Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：完成的很好, 继续加油
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