字符串判断，获取浏览器地址参数封装

//字符串判空
function isEmpty(obj) {
    return (obj === "undefined" || obj === null || obj === "");
}

//获取浏览器地址的参数
function getQueryString(name) {
    let reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
    let r = window.location.search.substr(1).match(reg);
    if (r != null) return unescape(r[2]);
    return null;
}