案例：jQuery案例     状态：可编辑再运行    进入竖版
 运行结果　
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<html>
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<head>
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<script type="text/javascript" src="/js/jquery.js"></script>
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<script type="text/javascript">
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$(document).ready(function(){
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  $("button").click(function(){
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    $.ajaxSetup({url:"/example/jq/demo_ajax_load.html",success:function(result){
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      $("div").html(result);}});
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    $.ajax();
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  });
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});
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</script>
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</head>
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​
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<body>
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​
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<div id="txt"><h2>通过 AJAX 改变文本</h2></div>
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<button>改变内容</button>
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​
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</body>
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</html>