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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<!DOCTYPE html>
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<html>
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<body>
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​
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<script>
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var person={
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firstname : "Bill",
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lastname  : "Gates",
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id        :  5566
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};
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document.write(person.lastname + "<br />");
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document.write(person["lastname"] + "<br />");
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</script>
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​
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</body>
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</html>
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​