What does let mean in javascript

This article mainly explains "what does let refer to in 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 is let in javascript".

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

2. The let keyword allows you to declare a variable, statement, or expression that is scoped or restricted to the block level.

Unlike var, the variables it declares can only be global or entire function blocks. In other words, block level = {}

Variables declared by let are only available in the blocks or subblocks they declare, similar to var. The main difference between the two is that the scope of the variable declared by var is the entire closed function, while the scope of the declaration of let is block.

What is the role of JavaScript? 1, can embed dynamic text in HTML pages.

2. Respond to browser events.

3. Read and write HTML elements.

4. Verify the data before it is submitted to the server.

5. Detect the browser information of visitors.

6. Control cookies, including creation and modification, etc.

7. Server-side programming based on Node.js technology.

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