停止从另一个函数执行Javascript函数 [英] Stop Javascript Function execution from another Function

问题描述

有什么方法可以阻止从另一个函数执行被调用的函数吗？

Is there any way to stop the execution of a called function from another function?

我有以下代码：-

function MainFunction() { //a long code that runs for few time  };
MainFuntion();

<button onclick="(Here I want some thing to stop MainFunction())">Stop the running script </button>

所以基本思想是从另一个函数返回一个函数

so basic idea is to return a function from another function

推荐答案

JavaScript通常是单线程的-这意味着，虽然在浏览器中执行了一个函数，但其​​他代码无法同时运行-包括事件处理程序，例如 onclick （仅在功能完成后才会触发）。因此，在这种情况下，您不能中断代码中函数的执行。

JavaScript is normally single threaded - meaning that while a function is executed in the browser no other code can run at the same time - including event handlers such as onclick (they will be triggered only after the function is complete). So, in this case you cannot interrupt the execution of a function from code.

有两种解决方法：

1. 长时间运行的功能可能会故意中断，从而允许执行其他代码。

1. The long running function could take breaks intentionally, allowing other code to execute.

//set this to true from an event handler to stop the execution
var cancelled = false;

function longRunningFunction() {
  if (cancelled) {
    return;
  } 

  // do some work, but not all
  // save your progress to be able to resume when called again

  if (!done) {
    // release control, so that handlers can be called, and continue in 10ms
    setTimeout(longRunningFunction, 10);
  }
}

使用网络工作者。它们允许并行运行代码，但有一些限制，并非所有浏览器都支持。

Use web workers. They allow running code in parallel, but have some restrictions and are not supported by all browsers.

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