按CSS查询一个 document.querySelector
按CSS查询
示例1 查询一个
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<!DOCTYPE html><html> <head> <title>访问元素</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <style> .mycolor{ color:#fff; } .steam{ text-decoration: initial; } </style> </head> <body> <ul id="ul"> <li id="a">油条</li> <li id="b" class="steam">包子</li> <li id="c" class="steam">米饺</li> <li id="d"><a>鱼粉</a></li> </ul> <script> // 返回一个元素节点 var el = document.querySelector('li.steam'); el.className='mycolor'; </script> </body></html> |