title: page stop responsing , when jquery request ajax
body: <pre><code>$.get(
  'http://request.url',function(response){
  document.write(response.returnText);
  });
  </code></pre>
  
  <p>the ajax url need a long time to response, when this request is processing, the page will not response, such as all of elements of links can not be clicked.</p>
  
  <p>I know ajax is a async request, and don't block main (page) thread, but everybody, why the page not responsed?</p>