Introduction to immediate execution function expressions in JavaScript, javascript expressions

Introduction to immediate execution function expressions in JavaScript, javascript expressions

We are used to seeing such an anonymous function.
Copy codeThe Code is as follows:
(Function (){
Console. log ("test ");
})();

Previously, self-executing anonymous function was called)

It turns out that there is another way to call the Function Expression Immediately (IIFE, Immediately-Invoked Function Expression)

Call function expression now

Compared with self-executed anonymous functions, the meaning of immediate call of function expressions is clearer.

Examples of Self-executed functions are as follows:
Copy codeThe Code is as follows:
Function foo () {foo ();}

And
Copy codeThe Code is as follows:
Var foo = function () {arguments. callee ();};

More importantly, the following may be self-executed anonymous functions.
Copy codeThe Code is as follows:
Var foo = function () {foo ();};