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This article mainly introduces the relevant knowledge of what JavaScript null represents, the content is detailed and easy to understand, the operation is simple and fast, and it has a certain reference value. I believe you will gain something after reading this JavaScript null article. Let's take a look at it.

Null means "nothing" in JavaScript by null.

Null is a special type that has only one value. Represents an empty object reference.

Note detects null with typeof and returns object.

You can set it to null to clear the object:

Example

Var person = null; / / value is null (empty), but the type is object

You can set it to undefined to clear the object:

Example

Var person = undefined; / / value is undefined, type is undefined

Undefined

In JavaScript, undefined is a variable with no set value.

Typeof A variable with no value returns undefined.

Example

Var person; / / value is undefined (empty), type is undefined

Any variable can be cleared by setting the value to undefined. Type is undefined.

Example

Person = undefined; / / value is undefined, type is undefined

This is the end of the article on "what does the null of JavaScript mean?" Thank you for reading! I believe you all have a certain understanding of the knowledge of "what JavaScript null means". If you want to learn more knowledge, you are welcome to follow the industry information channel.

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