查看“JS案例：isNaN()函数应用示例”的源代码

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<title>内置函数测试示例</title>
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<script type="text/javascript">
		document.writeln(isNaN(123));
		document.writeln(isNaN(123.45));
		document.writeln(isNaN(-123));
		document.writeln(isNaN(123+123));
		document.writeln(isNaN("1234"));
		document.writeln(isNaN("hello"));
		document.writeln(isNaN("2018/2/28"));
</script>
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