How to use the typeof operator of JavaScript

This article introduces the knowledge of "how to use the typeof operator of JavaScript". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

You can use the typeof operator to detect the data type of a variable.

Example

Typeof "John" / / returns string

Typeof 3.14 / / returns number

Typeof false / / returns boolean

Typeof [1, 2, 3, 4] / / return to object

Typeof {name:'John', age:34} / / returns object

In JavaScript, arrays are a special type of object. So typeof [1, 2, 3, 4] returns to object.

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