Type checking for array

2018-06-06 04:30:50

This question already has an answer here:

How do you check if a variable is an array in JavaScript? [duplicate] 24 answers

You could use

yourThing.constructor === Array

This returns true if yourThing is an array.

So you don't have to change Array's prototype. Modifying objects you don't own is widely seen as bad practice.

您可以使用instanceof （MDN文档）：

var arr = [];
if (arr instanceof Array) {
  console.log('this is an array');
}

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