var a = "hello" a instanceof String ===> false var a = new String("hello") a instanceof String ====> true var b = [1,2] b instanceof Array ===> true var b = new Array(1,2) b instanceof Array ===> true為什么String 的兩次結果是不一樣的，而Array是一樣的
js instanceof
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2018-10-18 14:10:59