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This article mainly explains the "JavaScript scope case analysis", the content of the article is simple and clear, easy to learn and understand, now please follow the editor's train of thought slowly in depth, together to study and learn "JavaScript scope case analysis"!

A scope is a collection of accessible variables.

JavaScript scope

In JavaScript, objects and functions are also variables.

In JavaScript, the scope is a collection of accessible variables, objects, and functions.

The scope of the JavaScript function: the scope is modified within the function.

JavaScript local scope

Variables are declared within the function and are locally scoped.

Local variables: can only be accessed within the function.

Example

/ / the carName variable cannot be called here

Function myFunction () {

Var carName = "Volvo"

/ / the carName variable can be called within the function

}

Because local variables only act within functions, different functions can use variables with the same name.

Local variables are created when the function starts to execute, and the local variables are automatically destroyed after the function is executed.

Thank you for your reading, the above is the content of "JavaScript scope instance Analysis". After the study of this article, I believe you have a deeper understanding of the problem of JavaScript scope instance analysis, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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