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This article mainly explains "how to declare a function in javascript". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how javascript declares a function.

1. Use the structure function of the function. In this method, the function is created with the help of the function structure function.

Technically, this method is better than using function expression syntax and function declaration statement syntax to declare a function.

2. Call a function expression, which is usually the same as variable assignment.

In short, the function body is treated as an expression, and the expression is assigned to the variable. Functions defined in this syntax can be named or anonymous.

No function names are called anonymous functions. The anonymous function is self-tuning, which means that it automatically calls itself. This behavior is also known as immediately called function expressions (IIFE).

3. Use function declaration, which is the old-fashioned method commonly used in JavaScript.

After the keyword function, you must specify the name of the function. Later, if the function accepts more than one parameter or parameter, it should also be mentioned. Although this part is completely optional.

In the function body, the function must return a value to the caller. When a return statement is encountered, the function stops execution. Parameters will be used as local variables within the function.

Similarly, the variables declared inside the function are local variables of the function. Local variables can only access this function, so variables with the same name can be easily used for different functions.

At this point, I believe you have a deeper understanding of "how to declare a function in javascript". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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