调用另一个函数时运行函数 [英] Run a function when another function is called

问题描述

我想知道在调用另一个函数时如何运行函数。 addEventListener 只运行click，mouseover等事件。但是，我想监听进行函数调用。




示例：

函数1 被调用。之后， Function 2 运行，因为它看到 Function 1 被调用。




是否有一个addEventListener替代简单函数而不是事件？我似乎找不到任何东西。




我的目标是每次用户执行某些操作时简单地运行一个函数，就像在jQuery或其他JavaScript库中隐藏某些内容时那样我添加了一些代码的另一个外部JavaScript文件。

I'm wondering how to run a function when another function is called. addEventListener only runs events like "click", "mouseover", etc. However, I'd like to listen for a function call.

EXAMPLE:
Function 1 is called. Afterwards, Function 2 runs because it saw that Function 1 was called.

Is there an addEventListener alternative for simple functions and not events? I can't seem to find any.

My goal was to simply run a function everytime a user did something like call for when something was hidden in jQuery or by another JavaScript library or just simply another external JavaScript file with some code I added in.

推荐答案

您将触发 myFunction内的事件并收听该事件。

You will have trigger an event inside myFunction and listen to that event.

function myFunction(){
    //This is the main function
    alert('Hello, this is part of the message!');
    // trigger the event
    var event = new CustomEvent("event", { "detail": "Example of an event" });
    document.dispatchEvent(event);



}
// handle here;
document.addEventListener("event", function(){
    //This is the secondary function
    //or the function I need to run after the main function is called
    alert('Hello, this is the other part of the message!');
});
// call main
myFunction();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>Simple test!</p>
<p>Long story short, you get message 1, but message 2 never pops up!</p>

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