JavaScript - 自动执行匿名函数和回调 [英] JavaScript - self-executing anonymous functions and callback

问题描述

我可以使用具有自动执行功能的回调吗？

如果是，您看过任何示例吗？

Can I use callback with self-executing function?
If yes, have you seen any examples?

JavaScript自执行函数：

JavaScript self-executing function:

(function(){

    //Do Stuff

})()

推荐答案

当然你可以 - 这是将变量封闭在某个函数中的常用方法，因此它们不会干扰全局变量（或来自单独的闭包）。

Of course you can - this is common way of enclosing your variables within some function so they do not interfere with global variables (or from separate closures).

一些例子：

(function(){

    var counter = 0;
    var step = function(){
        counter++;
        console.log(counter + ' Mississipi...');
    };

    setInterval(step, 1000);

})();

(function(){

    var counter = 0;
    var step = function(){
        counter++;
        console.log('3 seconds passed for a ' + counter + ' time');
    };

    setInterval(step, 3000);

})();

由于关闭，它们的变量不会干扰来自不同闭包的变量（不同的匿名）功能）。

Thanks to the closures, the variables from them are not interfering with the ones from different closure (different anonymous function).

这个jsfiddle 中的工作示例。

编辑：

您是否想要在此类函数的某些回调中执行代码，你可以这样写：

Is you want to execute the code from some callback in such function, you may write something like that:

var my_own_callback = function(data){
    // some code for callback working on data passed
};
// ...
(function(callback){
    var result; // future data sent to callback
    // do whatever you need here
    callback(result);
})(my_own_callback);

甚至是这样：

(function(callback){
    var result; // data that will be sent to callback
    // do whatever you need here
    callback(result);
})(function(data){
    // code for callback using data set to this callback
});

然而，这似乎相当疏忽，并且不必要地增加了代码的复杂性。

which, however, seems to be rather careless and unnecessarily increasing the complexity of your code.

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