案例:javascript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">
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function changeSrc()
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  {
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  document.getElementById("myImage").src="/img/eg_landscape.jpg"
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  }
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</script>
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</head>
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<body>
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<img id="myImage" src="/img/eg_bulbon.gif" />
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<br /><br />
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<input type="button" onclick="changeSrc()" value="改变图像">
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</body>
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</html>