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 str="How are you doing today?"
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document.write(str.split(" ") + "<br />")
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document.write(str.split("") + "<br />")
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document.write(str.split(" ",3))
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</script>
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</body>
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</html>
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