The difference between jquery (function () {}) and (function () {}) (jquery)

Share some of the lessons learned when developing jquery plugins.

first, look at

JQuery (function () {
});
All written as
JQuery (document). Ready (function () {
});

The meaning is that the ready () method is executed after the DOM has been loaded.

second, look again

(function () {
}) (JQuery);

It is actually an anonymous method of executing () (para), except that the jquery object is passed.

Iii. Summary

JQuery (function () {}); The code that holds the DOM object for the operation, and the DOM object already exists when the code executes it. cannot be used to store code that develops plug-ins, because jquery objects are not passed, and external methods (functions) cannot be called by Jquery.method.

(function () {}) (JQuery), which is used to store the code that develops the plug-in, and the DOM does not necessarily exist when executing the code, so be careful with the code to automate DOM operations directly.

Iv. Expansion 1

(function ($) {...}) (JQuery) is actually an anonymous function that does not know that a friend can continue to look down.

This is actually an anonymous function.

Function (ARG) {...}
This defines an anonymous function with the parameter arg.

When calling a function, the parentheses and arguments are written after the function, and because of the precedence of the operator, the function itself needs parentheses , namely:
(function (ARG) {...}) (param)
This is equivalent to defining an anonymous function with a parameter of ARG, and calling this anonymous function as a parameter to Param.

and (function ($) {...}) (jquery) is the same, the reason that only use $ in formal parameters is to not conflict with other libraries, so the argument with JQuery, equivalent to:
var fn = function ($) {...};
FN (jQuery);

V. Expansion 2

(function ($) {}) (jquery) is the usual way to initialize jquery objects.

(Funtion () {}) (); Execute the function immediately; it is equivalent to declaring a function, calling it directly after the declaration, and if the parameters are as follows:
(Funtion (str) {alert (str)}) ("Output")) ; equivalent: funtion outputfun (str) {alert (str);};o Utputfun ("Output");

"Reprint" http://www.cnblogs.com/swjm119/archive/2011/12/19/2293125.html

The difference between jquery (function () {}) and (function () {}) (jquery)