查找子节点element.firstElementChild,element.lastElementChild,element.children案例 

 1 <!doctype html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Document</title>
 6 </head>
 7 <body>
 8 <div>
 9     <ul id="ul">
10         <li>1</li>
11         <li>2</li>
12         <li>3</li>
13         <li>4</li>
14         <li>5</li>
15         <li>6</li>
16         <li>7</li>
17         <li>8</li>
18         <li>9</li>
19         <li>10</li>
20     </ul>
21 </div>
22 <script>
23     let ul = document.getElementById('ul');
24     ul.firstElementChild.style.backgroundColor = 'pink';
25     ul.lastElementChild.style.backgroundColor = 'pink';
26     document.write('ul子元素个数：'+ul.children.length)
27 </script>
28 </body>
29 </html>
posted @ 2019-12-20 15:15  杨小越  阅读(264)  评论(0)    收藏  举报