Can only access jQuery.ajax not $.ajax [closed]

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I have a strange problem. I have loaded jquery-min javascript in my file. But I can only access jQuery.ajax not $.ajax. $.ajax is said to be undefin开发者_如何学编程ed. Why is that?

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Are you using another framework which takes the $ function?

Look into JQuery's noConflict setup

Example:

<script type="text/javascript" src="other_lib.js"></script>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
  $.noConflict();
  jQuery(document).ready(function($) {
    // Code that uses jQuery's $ can follow here.
  });
  // Code that uses other library's $ can follow here.
</script>

You can even assign a different alias to JQuery other than $:

var j = jQuery.noConflict();
// Do something with jQuery
j("div p").hide();
// Do something with another library's $()
$("content").style.display = 'none';

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You can easily fix this by using a closure as well.

(function( $ ){

    // Your jQuery code here.

})( jQuery );