案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
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<script type="text/javascript">
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​
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document.write(Math.atan(0.50) + "<br />")
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document.write(Math.atan(-0.50) + "<br />")
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document.write(Math.atan(5) + "<br />")
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document.write(Math.atan(10) + "<br />")
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document.write(Math.atan(-5) + "<br />")
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document.write(Math.atan(-10))
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​
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</script>