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 arr = new Array()
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arr[0] = "George"
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arr[1] = "John"
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arr[2] = "Thomas"
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document.write(arr + "<br />")
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document.write(arr.unshift("William") + "<br />")
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document.write(arr)
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</script>
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</body>
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</html>
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