js 获取后缀参数

function getQueryString(name) {
var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
var url = decodeURI(window.location.search);
var r = url.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}