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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​
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<script type="text/javascript">
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​
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document.write(Math.sin(3) + "<br />")
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document.write(Math.sin(-3) + "<br />")
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document.write(Math.sin(0) + "<br />")
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document.write(Math.sin(Math.PI) + "<br />")
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document.write(Math.sin(Math.PI/2))
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​
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</script>
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​
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</body>
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</html>
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​