通过截取 URL 地址获取参数：

function getUrlParam(name){
    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
    var r = window.location.search.substring(1).match(reg);
    if (r != null) return decodeURIComponent(r[2]);
    return null;
}

调用：

//URL: https://www.baidu.com/s?wd=Abc&cid=111
let wd = getUrlParam('wd');
console.log(wd);   //Abc
let cid = getUrlParam('cid');
console.log(cid);  //111