Javascript小知识(取得QueryString即地址栏中参数)

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<!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>
    <title>javascript取得QueryString的方法</title>
    <script type="text/javascript">
        function GetQueryValue(searchUrl,queryStringName) 
        { 
            /**//*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 
            CopyRight: 网络有限公司 Joysos.Com 
            Description: 在javascript内实现QueryString 
            
            searchUrl: 查询字符串 document.location.search
            CreatDate: 2004-02-28 
            AuthorName:: WuMeibo wumeibo@joysos.com 
            LastUpdate: 
            ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/ 
            var vStr=""; 
            if (searchUrl==null || searchUrl=="" || queryStringName==null || queryStringName=="") return vStr; 
            //searchUrlsearchUrl = searchUrl.toLowerCase(); 
            //alert(searchUrl); 
            queryStringName += "="; 
            var itmp=searchUrl.indexOf(queryStringName); 
            //alert(itmp);
            if (itmp<0){return vStr;} 
            searchUrlsearchUrl = searchUrl.substr(itmp + queryStringName.length);
            //alert(searchUrl); 
            itmp=searchUrl.indexOf("&"); 
            if (itmp<0) 
            { 
                return searchUrl; 
            } 
            else 
            { 
                searchUrlsearchUrl=searchUrl.substr(0,itmp); 
                return searchUrl; 
            } 
        } 
        function f(){
            var str = GetQueryValue("http://www.hello.com?id=1namename=tree","name");
            alert(str);
        }
        window.onload = function(){
            var url = document.location.search;//取得的是?id=1
            var str = GetQueryValue(url,"page");
            i1.value = str;
        }
    </script>
</head>
<body>
<div>
<input type="button" value="取得querystring" onclick="f();" /><br />
当前页面码是：<br />
<input id="i1" type="text" />
</div>
</body>
</html>
end