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This article mainly introduces how to use typeof in js, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

Typeof

Typeof for primitive types, except for null, can display the correct type

Console.log (typeof 2); / / numberconsole.log (typeof true); / / booleanconsole.log (typeof 'str'); / / stringconsole.log (typeof []); / / the data type of the object [] array is interpreted in typeof as objectconsole.log (typeof function () {}); / / functionconsole.log (typeof {}) / / objectconsole.log (typeof undefined); / / undefinedconsole.log (typeof null); / / the data type of object null is interpreted as object by typeof

Typeof for objects, except functions will display object, so typeof can not accurately determine what type of variable is, so if you want to determine the correct type of an object, you can consider using instanceof

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