一下js代码在firefox下有loading...的效果，但是在IE里没有？why?

Question

  function LockPage() {  //用于显示一个进度loading...的效果
            if (document.all) {
                document.getElementById("btnLadding").click();
            }
            // 其它浏览器
            else {
                var e = document.createEvent("MouseEvents");
                e.initEvent("click", true, true);
                document.getElementById("btnLadding").dispatchEvent(e);
            }
            document.getElementById('shadow_mask').style.display = "block";
            document.getElementById('overlay').style.display = "block";
            //document.body.style.overflow = "hidden"
        }        function UnLockPage() {//隐藏显示loading....
            document.getElementById('shadow_mask').style.display = "none";
            document.getElementById('overlay').style.display = "none";
        }testLoading(flag){
            LockPage();
           var url2 = "AlertMessage.aspx";
                var isAge18;
                $.ajax({ async: false, type: "post", url: "GoalSummary.aspx", data: { jqAction: "isAge18", jAutoPostBack: autoPostBack }, success: function (data, textStatus) { isAge18 = data; } });
                if (isAge18 == "no") {
                    OpenIframe(url2 + "?alertType="+isAge18.toString(), 600, 300);
                    return;
                }              OpenIframe(url2 + "?alertType=targetDCILessThan1200&noPromptMsg=1", 800, 400);
                    UnLockPage();
}
请高手赐教。谢谢。

Answer 1

if (document.all) {
  document.getElementById("btnLadding").fireEvent("onclick");
  }