Understanding of self-executing anonymous functions in JavaScript (personal understanding also called anonymous functions that are immediately executed)

Format:

(function () {//code}) ();

The first pair of parentheses of the enclosing function (function () {}) returns an unnamed function to the script, followed by a pair of empty parentheses that immediately execute the returned unnamed function, which is the parameter of the anonymous function in parentheses.

(function (ARG) {alert (arg+100);}) (20);

This example returns 120.

Come back to see jquery plugin writing

(function ($) {  //Code Goes here}) (JQuery);

This code is equivalent to

var A=functon ($) {//code};a (jQuery);

The above content is from http://www.cnblogs.com/ac1985482/archive/2013/03/13/2957779.html

Can solve the problem caused by the nested function structure of the closure, see http://www.cnblogs.com/mzwr1982/archive/2012/05/20/2509295.html

Understanding of self-executing anonymous functions in JavaScript (personal understanding also called anonymous functions that are immediately executed)