Javascript 得到url指定参数的function

 function GetUrlValue(key, url) {            var startIndex = url.indexOf(key);            if (startIndex != -1) {                var keyValue = url.substring(startIndex);                keyValue = keyValue.replace(key + "=", "");                startIndex = keyValue.indexOf("&");                if (startIndex != -1) {                    keyValue = keyValue.substring(0, startIndex);                }                startIndex = keyValue.indexOf("'");                if (startIndex != -1) {                    keyValue = keyValue.substring(0, startIndex);                }                return keyValue;            }            return "";        }

直接在js文件中调用

var parmvalue= GetUrlValue('id','id=4&refer=aaaa');

就能得到id的值了