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.atan2(0.50,0.50) + "<br />")
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document.write(Math.atan2(-0.50,-0.50) + "<br />")
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document.write(Math.atan2(5,5) + "<br />")
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document.write(Math.atan2(10,20) + "<br />")
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document.write(Math.atan2(-5,-5) + "<br />")
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document.write(Math.atan2(-10,10))
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​
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</script>