offsetHeight 正则表达式验证格式

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 {
        20%;
        height:50px;
        background-color:yellow;
        margin-left:2%;
        }
    </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>

View Code

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>

View Code