Introduction to JavaScript advanced syntax_javascript skills

(function($){})(jQuery);

It’s actually relatively simple, you need to understand a few concepts:

1. (), in JavaScript () means executing a method, such as:

function x(){

alert("xxx");

}

var a = x; // No call, a is a function

var a = x(); //The function is called, and the value of a is the result of the call: undefined

2. jQuery is a jQuery object, which means that when calling a function, a parameter passed in is a jQuery object.

There’s nothing to say about this

3. (function($){}) This is an anonymous function, the formal parameter is $, and parentheses are definitely required.

You can understand it at a glance. The above formula is equivalent to

var f = function($){};

f(jQuery);

Look at it now, it’s neither simple nor weird...