<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
<script src="App_Themes/Default/js/jquery-1.4.2.min.js" type="text/javascript"></script>
<script language="javascript" type="text/javascript">
$(function(){
alert($("div").length);});
</script>
</head>
<body>
<form id="form1" runat="server">
<p>one</p> <div><p>two</p></div> <p>three</p><div></div>
</form>
</body>
</html>
得到的结果是3,我找了半天只有2个div,我就想不明白
<head runat="server">
<title>无标题页</title>
<script src="App_Themes/Default/js/jquery-1.4.2.min.js" type="text/javascript"></script>
<script language="javascript" type="text/javascript">
$(function(){
alert($("div").length);});
</script>
</head>
<body>
<form id="form1" runat="server">
<p>one</p> <div><p>two</p></div> <p>three</p><div></div>
</form>
</body>
</html>
得到的结果是3,我找了半天只有2个div,我就想不明白
可能会自动生成一个div,所以,你的语法没错,你需查看浏览器的源代码,而不是aspx