获取Div 的height width等属性
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<style>
#a {
width:%;
height:50px;
background-color:yellow;
margin-left:%;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div id="a"></div>
<asp:Button ID="Button1" runat="server" Text="Button" />
</form>
</body>
</html>
<script>
document.getElementById("Button1").onclick = function ()
{
var a = document.getElementById("a");
alert(a.offsetHeight);//无论是在CSS里面还是Style里面都能取到值
alert(a.style.width);//只能取到Style里面的值，不能取到CSS里面的值
}
</script>
正则表达式验证格式
<script>
if(/^正则表达式$/.test(a.innerText))//注意（.test）
{
alert("正确");
}
else
{
alert("错误"); } </script>