js防堵塞载入

js防堵塞载入

<script type="text/javascript">
function scriptDomElement (u) {
  var s = document.createElement('script');
  h = document.getElementsByTagName('body')[0];
  s.src = u;
  s.async = true;
  if(h)h.appendChild(s,h.firstChild);
}
scriptDomElement('http://*************************?t=20140717');
</script>