未捕获到的SecurityError：阻止了具有原始\“ null \”的框架访问跨源框架

Question

更新的问题

我想要的是，每当您单击广告（链接）时，都会有一个“已单击”警报。

但是当我运行代码时，它说：

  

未捕获到的SecurityError：阻止了源为\“ null \”的帧   访问跨域框架。

请在此处http://jsfiddle.net/0pmofzty/23/检查代码

focus();
var parent = document.activeElement;
var iframe = document.getElementsByTagName('iframe')[0],
    iframeDoc = iframe.contentWindow.document;
var targetLinks = iframeDoc.getElementsByTagName('a');

var listener = addEventListener('blur', function() {
	if(document.activeElement === targetLinks) {
    alert("clicked!");
    focusParentEl();
	}
});

function focusParentEl() {
	iframe.blur();
	parent.focus();
  if(document.activeElement !== parent) {
  	setTimeout(focusParentEl, 500);
  }
}

<div id="container">
  <script>
    ll_r = "phinoy";
    ll_hc = "#545454";
    ll_tc = "#545454";
    ll_cc = "#e89d2b";
    ll_dc = "#7f8091";
    ll_w = "";
    ll_nf = "0";
    ll_nc = "0";
    ll_nh = "0";
    ll_nm = "0";
    ll_np = "0";
    ll_pa = "0";
    ll_nt = "0";
    ll_wt = "1";
    ll_fw = "1";
    ll_n = "6";
    ll_cl = "";
    ll_s = "w";
  </script>
  <script src="//www.leadsleap.com/w/js.js"></script>
</div>

此代码段很安全。我从另一个名为Leadsleap的广告公司那里获得了脚本，