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This article mainly explains "what is the global variable of JavaScript". The content of the explanation in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn what the global variable of JavaScript is.

ES2015 (ES6) adds two important JavaScript keywords: let and const.

Variables declared by let are valid only within the block of code where the let command is located.

Const declares a read-only constant, and once declared, the value of the constant cannot be changed.

Before ES6, JavaScript had only two scopes: global variables and local variables within functions.

The scope of variables declared outside the function is global:

Case study

Var carName = "Volvo"

/ / you can use the carName variable here

Function myFunction () {

/ / you can also use the carName variable here

}

Global variables can be accessed anywhere in the JavaScript program.

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