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This article mainly explains "the introduction and example usage of function scope in javascript". The content of the explanation in this 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 "the introduction and example usage of function scope in javascript".

1. Create the function scope when calling the function, and destroy the function scope after the function is executed.

2. Each time a function is called, a new function scope is created, and they are independent of each other.

Variables in the global scope can be accessed in the function scope, while variables in the function scope cannot be accessed in the global scope.

When you manipulate a variable in a function scope, it will first find it in its own scope, if there is, it will use it directly, if not, it will find it in the upper scope until it finds the overall scope, and if there is still no overall scope, it will report an error ReferenceErrror.

Example

Function calculate (a) {b = a + add (a * 2); console.log (b * 3);} function add (a) {return a + 1;} var bsetter (2) / / 21 Thank you for your reading. The above is the content of "introduction of function scope and example usage in javascript". After the study of this article, I believe you have a deeper understanding of the introduction of function scope and example usage in javascript, and the specific use needs to be verified by practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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