google ajax loading

gistfile1.htm

<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<script type="text/javascript" language="javascript">
  google.load("jquery", "1.2");
  google.load("jqueryui", "1.5.2"); // 不用 jQuery UI 可以不用此行
</script> 

<script type="text/javascript" language="javascript">
  $(document).ready(function() {
    alert($);
  });
</script> 


<script type="text/javascript" language="javascript">
  google.load("ext-core", "3.0.0");
</script> 

<script type="text/javascript" language="javascript">
  Ext.onReady(function() {
    alert(Ext);
  });
</script>