What's the difference?

Question

    add=function(){}

     function add(){}

Answer 1

The functions are the same, but the meaning is a little different. The first is to define a variable and let the anonymous function assign the value.

The second is an ordinary non-anonymous function, which is the same when called. You should I know that the immediate execution function is somewhat similar to the anonymous one

In short, you can write it however you want, as long as it can be called

Answer 2

These are the two most basic ways of function declaration.

var add = function () { }

This method defines the namespace as add to avoid duplication of method names in other class libraries.

function add() { }

This is a general way of writing, and it is easy to cause naming conflicts when using various plug-ins.