如何用js获取当前url的参数值

<script language = javascript> 
function request(paras){ 
var url = location.href;  
var paraString = url.substring(url.indexOf("?")+1,url.length).split("&");  
var paraObj = {}  
for (i=0; j=paraString[i]; i++){  
paraObj[j.substring(0,j.indexOf("=")).toLowerCase()] = j.substring(j.indexOf("=")+1,j.length);  
}  
var returnValue = paraObj[paras.toLowerCase()];  
if(typeof(returnValue)=="undefined"){  
return "";  
}else{  
return returnValue; 
}
}
//如你给出的地址可以这样
var classid = request("classid");
var id = request("id");

//然后你就可以对这些参数处理了
</script>