///获取url中指定参数         // <param name="paras">参数名称</param>         ///         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;             }         }