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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<body>
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<script type="text/javascript">
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var o = new Object();
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Object.prototype.sayHi = function () {
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  document.write("hi");
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};
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o.sayHi();
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</script>
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</body>
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</html>
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