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