静态页面取地址？后面的参数值

1：比如https://mp.csdn.net/postedit?id=1

var id = getQueryString(id) 

function getQueryString(name){
        var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
        var r = window.location.search.substr(1).match(reg);
        if (r != null) {
            encodeURIComponent()
            return decodeURIComponent(r[2]);
        }else{
            return "-9999";
        }
    }