js获取当前url的参数

<scripttype="text/javascript">

/*取得当前url的参数

 * paras:参数名

 * 例子: www.163.com?id=1234&pw=5678

 * var id = request('id') //1234

 * var pw = request('ps') //5678

 * 作者：夏雨

*/

function request(paras,url){ 

    if(typeof url == "undefined" || url== ''){

       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; 

    }

}

</script>