A more refined Javascript typeof?

2018-06-09 04:16:16

This question already has an answer here:

Check if object is array? 38 answers

您不能扩展typeof运算符，但为了更好地进行类型检查，您可以（ab）使用Object.prototype.toString

Object.prototype.toString.call([]) === '[object Array]'
Object.prototype.toString.call(document) === '[object HTMLDocument]`

You can use Array.isArray() for it.

The Array.isArray() method returns true if an object is an array, false if it is not.

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