tryjquery_sel_first 在线代码实例

实例代码( Tip: 登录后体验更佳 )
运行代码

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="//libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("p:first").css("background-color","yellow");
});
</script>
</head>
<body>
<p>这是第一个段落。</p>
<p>这是第二个段落。</p>
<p>这是最后一个段落。</p>
</body>
</html>
 
 
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运行结果
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