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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  $("#txt").ajaxStart(function(){
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    $("#wait").css("display","block");
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  });
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  $("#txt").ajaxComplete(function(){
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    $("#wait").css("display","none");
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  });
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  $("button").click(function(){
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    $("#txt").load("/example/jq/demo_ajax_load.html");
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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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<div id="wait" style="display:none;width:69px;height:89px;border:1px solid black;position:absolute;top:50%;left:50%;padding:2px;">
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<img src='/img/demo_wait.gif' width="64" height="64" />
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<br />加载中 ...
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</div>
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​
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</body>
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</html>