我如何测试 NaN? [英] How do I test for NaN?

问题描述

可能的重复:
比较 Javascript 中的 NaN 值是否相等

谁能告诉我为什么这不起作用?

Can anyone tell me why this is not working?

if(inbperr == NaN) {
    document.getElementById('inbclo').value = "N/A";
}
else {
    document.getElementById('inbclo').value = "%" + inbperr;
}

与其返回百分比值或N/A"，我希望它返回%NaN".

Instead of returning a percentage value, or "N/A", I want it to return "%NaN".

推荐答案

NaN 是不寻常的:它们不等于任何东西，甚至它们自己.您需要使用 isNaN(inbperr) 来判断一个值是否为 NaN.

NaN's are unusual: they are not equal to anything, even themselves. You need to use isNaN(inbperr) to tell whether a value is a NaN or not.

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