JS獲取當前頁面URL參數值

 function getQueryString(name) {
            const reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
            const urlObj = window.location;
            var r = urlObj.href.indexOf('#') > -1 ? urlObj.hash.split("?")[1].match(reg) : urlObj.search.substr(1).match(reg);
            if (r != null) return unescape(r[2]); return null;
        }

alert(getQueryString("參數名稱"));