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This article mainly shows you "how to use the keyword const to declare variables in es6". The content is simple and easy to understand, and the organization is clear. I hope it can help you solve your doubts. Let Xiaobian lead you to study and learn this article "how to use the keyword const to declare variables in es6".

Declare variables with keyword const

const a; //error, const b = 1 must be initialized;

const variables cannot be modified and must be initialized

This variable is either a global variable or a global variable within a module.

If a variable is assigned only once when it is declared and never reassigned in other lines of code, const should be used, but the initial value of the variable may be adjusted in the future (constant variable).

Create a read-only constant that appears unmodifiable in different browsers; it is recommended not to modify it after declaration; it has block-level scope

const represents a constant index of a value, that is, the pointer to the variable name in memory cannot change, but the value pointing to the variable may change.

const The variables defined by const cannot be modified. Generally, when requiring a module, use or define some global constants.

Constants can be declared globally or within functions, but they must be initialized

A constant cannot have the same name as any other variable or function in its scope.

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