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這個方法返回一個數位絕對值。
文法
| 1 | Math.abs( x ) ; |
下面是參數的詳細資料：
傳回值:
例子：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | <html> <head> <title>JavaScript Math abs() Method</title> </head> <body> <script type="text/javascript"> var value = Math.abs(-1); document.write("First Test Value : " + value ); var value = Math.abs(null); document.write("<br />Second Test Value : " + value ); var value = Math.abs(20); document.write("<br />Third Test Value : " + value ); var value = Math.abs("string"); document.write("<br />Fourth Test Value : " + value ); </script> </body> </html> |
這將產生以下結果：
| 1 2 3 4 | First Test Value : 1 Second Test Value : 0 Third Test Value : 20 Fourth Test Value : NaN |
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