What is the difference between var a=function and function a?

Little scum · Posted on 6/8/2017 1:31:11 PM

Javascrip{filter}t, what is the difference between var foo = function () {} and function foo() when defining functions?

Cause: Javascrip{filter}t "hoist" behavior declared by functions and variables.

Difference 1: Code 1, after loading the JS code, A is "advanced", but the specific content in the function is not advanced. It is to initialize the code block in the function when it is called. Code 2: It loads "ahead of schedule".

Method 1:

var foo = function () { //code }

This method defines the namespace as foo to avoid duplication of method names with other libraries.

Method 2:

function foo () { //code }

This is a general way of writing, and it is easy to create naming conflicts when using various plugins.

l002315 · Posted on 11/8/2017 3:18:28 PM

Yes, I learned

[JavaScript] What is the difference between var a=function and function a?

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