const http = window.location.href;            function getUrlParam(url, name) {                let pattern = new RegExp("[?&]" + name + "\=([^&]+)", "g");                let matcher = pattern.exec(url);                let items = null;                if (matcher != null) {                    try {                        items = decodeURIComponent(decodeURIComponent(matcher[1]));                    } catch (e) {                        try {                            items = decodeURIComponent(matcher[1]);                        } catch (e) {                            items = matcher[1];                        }                    }                }                return items;            }