Math.abs( x )
下面是参数的详细信息:
- x : 一个数字
返回值:
- 返回一个数字的绝对值
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<html>
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<head>
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<title>JavaScript Math abs() Method</title>
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</head>
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<body>
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<script type="text/javascript">
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var value = Math.abs(-1);
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document.write("First Test Value : " + value );
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var value = Math.abs(null);
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document.write("<br />Second Test Value : " + value );
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var value = Math.abs(20);
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document.write("<br />Third Test Value : " + value );
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var value = Math.abs("string");
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document.write("<br />Fourth Test Value : " + value );
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</script>
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</body>
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</html>
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这将产生以下结果:
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First Test Value : 1
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Second Test Value : 0
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Third Test Value : 20
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Fourth Test Value : NaN
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