实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
AخA
 
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<!DOCTYPE html>
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<html>
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    <head>
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        <title>
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            Subtract Example 1
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        </title>
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        <script type="text/javascript">
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            var result1 = 5 - true; //4 because true is converted to 1
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            var result2 = NaN - 1; //NaN
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            var result3 = 5 - 3; //2
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            var result4 = 5 - ""; //5 because "" is converted to 0
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            var result5 = 5 - "2"; //3 because "2" is converted to 2
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            var result6 = 5 - null; //5 because null is converted to 0
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            alert(result1);
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            alert(result2);
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            alert(result3);
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            alert(result4);
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            alert(result5);
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            alert(result6);
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        </script>
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    </head>
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    <body>
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    </body>
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</html>