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Recent questions tagged js中如何创建一个undifined的对象（函数），内含有值。例如

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js中如何创建一个undifined的对象（函数），内含有值。例如 typeof(a) = undifined
    原因是发现document.all方法的Boolean值为false， 而使用typeof（document.all) 返回值是undifined， 但是document.all确实是有值的。 是否有某些方法可以重写对象本身的Boolean值的方法呢?...
asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)
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