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实例代码( Tip: 登录后体验更佳 )
运行代码 
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool在线教程(w3cschool.cn)</title>  
<script src="/statics/js/jquery-1.8.3.min.js"></script>
</head>
<body>
<div id="n1">
    <p id="n2">Hello</p>
    <p id="n3">
        W3Cschool
        <span id="n4">学技术，从W3Cschool开始！</span>
        <span id="n5"></span>
    </p>
</div>
<script>
var $n2 = $("#n2");
alert( $n2.html() ); // Hello
// 设置n2的html内容
$n2.html( '<strong>Hello W3Cschool</strong>' );
var $n3 = $("#n3");
alert( $n3.html() );
/*
CodePlayer
<span id="n4">学技术，从W3Cschool开始！</span>
<span id="n5"></span>
*/
// 清空所有span元素的html内容(将html内容设为"")
$("span").html( "" );
// 将所有p元素的html内容改为"第<em>N</em>个p元素，id为this.id"
// 这里的N表示该元素在所有匹配元素中的序号(1、2、3……)
// this.id是该元素的id属性值
 
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运行结果
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