javascript获取url中的GET参数，并且重新发一个新的xml请求

clickpost()

function clickpost(){
    var tracking   = 'http://www.demo.com/tracking?type=click&';
    var adurl      = window.location.href.split("?");
    var parameters = adurl[1];
    var xmlhttp;

    if (window.XMLHttpRequest) { // code for IE7+, Firefox, Chrome, Opera, Safari
        xmlhttp = new XMLHttpRequest();
        xmlhttp.open('GET', tracking + parameters, true);
        xmlhttp.send();
    } else { // code for IE6, IE5
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        xmlhttp.open('GET', tracking + parameters, true);
        xmlhttp.send();
    }
}