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>
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