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This article will explain in detail the example analysis of the cyclic scope in JavaScript. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Cyclic scope

Use var in a loop:

Example

Var I = 7 for (var I = 0; I < 10; iSense +) {/ / some statements} / / here, I is 10

Use let in a loop:

Example

Let I = 7 for (let I = 0; I < 10; iSense +) {/ / some statements} / / where I is 7

In the first example, the variables used in the loop use var to redeclare variables outside the loop.

In the second example, the variables used in the loop use let and do not redeclare variables outside the loop.

If you declare the variable I with let in the loop, it is only within the loop that the variable I is visible.

This is the end of this article on "sample analysis of cyclic scope in JavaScript". I hope the above content can be helpful to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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