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你有多少种方法判断一个数据是否属于数组呢？ #33

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CodeRookie262 opened this issue Jan 29, 2021 · 1 comment

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Array javascript

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CodeRookie262 commented Jan 29, 2021

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CodeRookie262 commented Feb 1, 2021

通过 Array.prototype.isArray 判断一个数据是否属于数组；
通过 instanceof 判断该数据是否属于Array 实例（缺点：可以修改构造函数上的 Symbol.hasInstance 方法来伪造结果）；
通过 constructor 判断是否是 Array 实例化（只能判断直系构造函数）；
通过 Object.prototype.toString.call 来判断数据是否属于 Array 实例；
判断该数据的原型链上是否存在 Array.prototype，这个方法和 instanceof 差不多；

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