var url = "https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&tn=baidu&wd=nodemon&rsv_sug4=2634";

function parseQueryString(url){

    var urlKey = url.split("?")[1]

    var objKeyValue ={}

    if(urlKey){

        var urlObj = urlKey.split("&")

        // 以对象形式存放

        for(var i = 0; i<urlObj.length;i++){

            objKeyValue[urlObj[i].split("=")[0]] = urlObj[i].split("=")[1]

        }

        return objKeyValue

    }else{

        return "暂无参数"

    }

}

var s = parseQueryString(url)

console.log(s)