//获取url参数
    function GetQueryString(name) {
        var reg = new RegExp("(^|\\?)" + name + "=([^&]*)(&|$)");
        var scripts = document.getElementsByTagName('script');
        var Getscriptssrc = "";
        for (var i = 0; i < scripts.length; i++) {
            var scriptssrc = scripts[i].src;
            if (scriptssrc.indexOf("mystat.aspx") > -1) {
                Getscriptssrc = scriptssrc;
                break;
            }
        }
        if (Getscriptssrc != "") {
            var r = Getscriptssrc.match(reg);
            if (r != null) return unescape(r[2]);
        }
        return null;
    }

    var mystatUParam = GetQueryString("u");
    if(mystatUParam==undefined)
        mystatUParam = GetQueryString("U");
    if (mystatUParam == undefined)
        mystatUParam = "{ID}240230";

document.write("<iframe style='width: 0px; height: 0px; display:none; ' "+"src='https://www.chem17.com/asyncstat.aspx?u=" + escape(mystatUParam) + "&referer=" + escape(document.referrer) + "&title=" + escape(document.title) + "'></iframe>");