摘要:
what's this?The Proxy object is used to define custom behavior for fundamental operations (e.g. property lookup, assignment, enumeration, function inv 阅读全文
摘要:
The global NaN property is a value representing Not-A-Number.--MDNNaN 是用来表示一个非数字的值得全局属性,但是typeof之后的运算结果 却是 number。虽说undefined和null都有空值的含义,然而 isNaN( 1 阅读全文