In-depth understanding of self-executing anonymous functions in Javascript (graphic tutorial)

Below I will bring you an in-depth understanding of self-executing anonymous functions in Javascript. Let me share it with you now and give it as a reference for everyone.

Format:

(function(){
//代码
})();

Explanation: This is quite elegant code (you may be confused if you see it for the first time:)), the first pair surrounding the function (function(){}) The parentheses return an unnamed function to the script, and then a pair of empty parentheses immediately executes the returned unnamed function, with the parameters of the anonymous function inside the parentheses.

Let’s take an example with parameters:

(function(arg){
alert(arg+100);
})(20);
// 这个例子返回120。

Come back and take a look at jquery plug-in writing

(function($) {
 // Code goes here
})(jQuery);

This code is equivalent to

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

a(jQuery);

The above is what I compiled Everyone, I hope it will be helpful to everyone in the future.

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