javascript：pause setTimeout（）;

如果我设置了活动超时var t = setTimeout("dosomething()", 5000)，

反正有暂停和恢复吗？

您可以这样包装window.setTimeout，我认为这与您在问题中建议的内容类似：

var Timer = function(callback, delay) {
    var timerId, start, remaining = delay;

    this.pause = function() {
        window.clearTimeout(timerId);
        remaining -= Date.now() - start;
    };

    this.resume = function() {
        start = Date.now();
        window.clearTimeout(timerId);
        timerId = window.setTimeout(callback, remaining);
    };

    this.resume();
};

var timer = new Timer(function() {
    alert("Done!");
}, 1000);

timer.pause();
// Do some stuff...
timer.resume();

这样的事情应该可以解决问题。

function Timer(fn, countdown) {
    var ident, complete = false;

    function _time_diff(date1, date2) {
        return date2 ? date2 - date1 : new Date().getTime() - date1;
    }

    function cancel() {
        clearTimeout(ident);
    }

    function pause() {
        clearTimeout(ident);
        total_time_run = _time_diff(start_time);
        complete = total_time_run >= countdown;
    }

    function resume() {
        ident = complete ? -1 : setTimeout(fn, countdown - total_time_run);
    }

    var start_time = new Date().getTime();
    ident = setTimeout(fn, countdown);

    return { cancel: cancel, pause: pause, resume: resume };
}

不需要。您需要取消它（clearTimeout），测量自启动以来的时间，然后以新的时间重新启动它。

Tim Downs 答案的略微修改版本。但是，由于Tim 撤消了我的编辑，所以我必须自己回答。我的解决方案使得可以将多余的参数arguments用作第三（3、4、5 ...）参数并清除计时器：

function Timer(callback, delay) {
    var args = arguments,
        self = this,
        timer, start;

    this.clear = function () {
        clearTimeout(timer);
    };

    this.pause = function () {
        this.clear();
        delay -= new Date() - start;
    };

    this.resume = function () {
        start = new Date();
        timer = setTimeout(function () {
            callback.apply(self, Array.prototype.slice.call(args, 2, args.length));
        }, delay);
    };

    this.resume();
}

如Tim所述，多余的参数在中不可用IE lt 9，但是我做了一些努力，以便在oldIE。

用法： new Timer(Function, Number, arg1, arg2, arg3...)

function callback(foo, bar) {
    console.log(foo); // "foo"
    console.log(bar); // "bar"
}

var timer = new Timer(callback, 1000, "foo", "bar");

timer.pause();
document.onclick = timer.resume;

在的上下文中setTimeout，“暂停”和“恢复”并没有多大意义，这是一次性的事情。你是说setInterval吗 如果是这样，则不能，您不能暂停它，只能取消它（clearInterval），然后重新安排它的时间。所有这些的详细信息在规范的“ 计时器”部分。

// Setting
var t = setInterval(doSomething, 1000);

// Pausing (which is really stopping)
clearInterval(t);
t = 0;

// Resuming (which is really just setting again)
t = setInterval(doSomething, 1000);

超时很容易找到解决方案，但是间隔有些棘手。

我提出了以下两个类来解决此问题：

function PauseableTimeout(func, delay){
    this.func = func;

    var _now = new Date().getTime();
    this.triggerTime = _now + delay;

    this.t = window.setTimeout(this.func,delay);

    this.paused_timeLeft = 0;

    this.getTimeLeft = function(){
        var now = new Date();

        return this.triggerTime - now;
    }

    this.pause = function(){
        this.paused_timeLeft = this.getTimeLeft();

        window.clearTimeout(this.t);
        this.t = null;
    }

    this.resume = function(){
        if (this.t == null){
            this.t = window.setTimeout(this.func, this.paused_timeLeft);
        }
    }

    this.clearTimeout = function(){ window.clearTimeout(this.t);}
}

function PauseableInterval(func, delay){
    this.func = func;
    this.delay = delay;

    this.triggerSetAt = new Date().getTime();
    this.triggerTime = this.triggerSetAt + this.delay;

    this.i = window.setInterval(this.func, this.delay);

    this.t_restart = null;

    this.paused_timeLeft = 0;

    this.getTimeLeft = function(){
        var now = new Date();
        return this.delay - ((now - this.triggerSetAt) % this.delay);
    }

    this.pause = function(){
        this.paused_timeLeft = this.getTimeLeft();
        window.clearInterval(this.i);
        this.i = null;
    }

    this.restart = function(sender){
        sender.i = window.setInterval(sender.func, sender.delay);
    }

    this.resume = function(){
        if (this.i == null){
            this.i = window.setTimeout(this.restart, this.paused_timeLeft, this);
        }
    }

    this.clearInterval = function(){ window.clearInterval(this.i);}
}

这些可以这样实现：

var pt_hey = new PauseableTimeout(function(){
    alert("hello");
}, 2000);

window.setTimeout(function(){
    pt_hey.pause();
}, 1000);

window.setTimeout("pt_hey.start()", 2000);

本示例将设置一个可暂停的超时（pt_hey），该超时时间安排为在两秒钟后提醒“嘿”。一秒钟后，另一个超时会暂停pt_hey。第二次超时将在两秒钟后恢复pt_hey。pt_hey运行一秒钟，暂停一秒钟，然后恢复运行。pt_hey在三秒钟后触发。

现在需要更棘手的间隔

var pi_hey = new PauseableInterval(function(){
    console.log("hello world");
}, 2000);

window.setTimeout("pi_hey.pause()", 5000);

window.setTimeout("pi_hey.resume()", 6000);

本示例设置一个可暂停的时间间隔（pi_hey），以每两秒钟在控制台中写入“ hello world”。超时会在五秒钟后暂停pi_hey。六秒后，另一个超时将恢复pi_hey。因此pi_hey将触发两次，运行一秒钟，暂停一秒钟，运行一秒钟，然后每2秒继续触发一次。

其他功能

• clearTimeout（）和clearInterval（）

  pt_hey.clearTimeout();并pi_hey.clearInterval();用作清除超时和时间间隔的简便方法。

• getTimeLeft（）

  pt_hey.getTimeLeft();并pi_hey.getTimeLeft();会返回多少毫秒，直到安排下一次触发发生为止。

我需要计算经过和剩余的时间才能显示进度条。使用公认的答案并不容易。对于此任务，“ setInterval”优于“ setTimeout”。因此，我创建了可在任何项目中使用的Timer类。

https://jsfiddle.net/ashraffayad/t0mmv853/

'use strict';


    //Constructor
    var Timer = function(cb, delay) {
      this.cb = cb;
      this.delay = delay;
      this.elapsed = 0;
      this.remaining = this.delay - self.elapsed;
    };

    console.log(Timer);

    Timer.prototype = function() {
      var _start = function(x, y) {
          var self = this;
          if (self.elapsed < self.delay) {
            clearInterval(self.interval);
            self.interval = setInterval(function() {
              self.elapsed += 50;
              self.remaining = self.delay - self.elapsed;
              console.log('elapsed: ' + self.elapsed, 
                          'remaining: ' + self.remaining, 
                          'delay: ' + self.delay);
              if (self.elapsed >= self.delay) {
                clearInterval(self.interval);
                self.cb();
              }
            }, 50);
          }
        },
        _pause = function() {
          var self = this;
          clearInterval(self.interval);
        },
        _restart = function() {
          var self = this;
          self.elapsed = 0;
          console.log(self);
          clearInterval(self.interval);
          self.start();
        };

      //public member definitions
      return {
        start: _start,
        pause: _pause,
        restart: _restart
      };
    }();


    // - - - - - - - - how to use this class

    var restartBtn = document.getElementById('restart');
    var pauseBtn = document.getElementById('pause');
    var startBtn = document.getElementById('start');

    var timer = new Timer(function() {
      console.log('Done!');
    }, 2000);

    restartBtn.addEventListener('click', function(e) {
      timer.restart();
    });
    pauseBtn.addEventListener('click', function(e) {
      timer.pause();
    });
    startBtn.addEventListener('click', function(e) {
      timer.start();
    });

/复活

使用y类语法糖的ES6版本💋

（稍作修改：添加了start（））

class Timer {
  constructor(callback, delay) {
    this.callback = callback
    this.remainingTime = delay
    this.startTime
    this.timerId
  }

  pause() {
    clearTimeout(this.timerId)
    this.remainingTime -= new Date() - this.startTime
  }

  resume() {
    this.startTime = new Date()
    clearTimeout(this.timerId)
    this.timerId = setTimeout(this.callback, this.remainingTime)
  }

  start() {
    this.timerId = setTimeout(this.callback, this.remainingTime)
  }
}

// supporting code
const pauseButton = document.getElementById('timer-pause')
const resumeButton = document.getElementById('timer-resume')
const startButton = document.getElementById('timer-start')

const timer = new Timer(() => {
  console.log('called');
  document.getElementById('change-me').classList.add('wow')
}, 3000)

pauseButton.addEventListener('click', timer.pause.bind(timer))
resumeButton.addEventListener('click', timer.resume.bind(timer))
startButton.addEventListener('click', timer.start.bind(timer))

<!doctype html>
<html>
<head>
  <title>Traditional HTML Document. ZZz...</title>
  <style type="text/css">
    .wow { color: blue; font-family: Tahoma, sans-serif; font-size: 1em; }
  </style>
</head>
<body>
  <h1>DOM &amp; JavaScript</h1>

  <div id="change-me">I'm going to repaint my life, wait and see.</div>

  <button id="timer-start">Start!</button>
  <button id="timer-pause">Pause!</button>
  <button id="timer-resume">Resume!</button>
</body>
</html>

您可以查看clearTimeout（）

或暂停取决于在达到特定条件时设置的全局变量。就像按下一个按钮一样。

  <button onclick="myBool = true" > pauseTimeout </button>

  <script>
  var myBool = false;

  var t = setTimeout(function() {if (!mybool) {dosomething()}}, 5000);
  </script>

您还可以通过事件来实现它。

无需计算时差，而是开始和停止侦听一直在后台运行的“ tick”事件：

var Slideshow = {

  _create: function(){                  
    this.timer = window.setInterval(function(){
      $(window).trigger('timer:tick'); }, 8000);
  },

  play: function(){            
    $(window).bind('timer:tick', function(){
      // stuff
    });       
  },

  pause: function(){        
    $(window).unbind('timer:tick');
  }

};

如果您使用的是jquery，请查看$ .doTimeout插件。这是对setTimeout的巨大改进，其中包括让您使用指定的单个字符串ID跟踪超时，并且每次设置时该字符串ID都不会更改，并实现了轻松的取消，轮询循环和反跳操作，以及更多。我最常用的jquery插件之一。

不幸的是，它不支持开箱即用的暂停/继续。为此，您可能需要包装或扩展$ .doTimeout，大概与接受的答案类似。

我需要能够暂停setTimeout（）以实现类似幻灯片的功能。

这是我自己的可暂停计时器的实现。它整合了在Tim Down的答案中看到的评论，例如更好的停顿（内核的评论）和原型制作的形式（Umur Gedik的评论）。

function Timer( callback, delay ) {

    /** Get access to this object by value **/
    var self = this;



    /********************* PROPERTIES *********************/
    this.delay = delay;
    this.callback = callback;
    this.starttime;// = ;
    this.timerID = null;


    /********************* METHODS *********************/

    /**
     * Pause
     */
    this.pause = function() {
        /** If the timer has already been paused, return **/
        if ( self.timerID == null ) {
            console.log( 'Timer has been paused already.' );
            return;
        }

        /** Pause the timer **/
        window.clearTimeout( self.timerID );
        self.timerID = null;    // this is how we keep track of the timer having beem cleared

        /** Calculate the new delay for when we'll resume **/
        self.delay = self.starttime + self.delay - new Date().getTime();
        console.log( 'Paused the timer. Time left:', self.delay );
    }


    /**
     * Resume
     */
    this.resume = function() {
        self.starttime = new Date().getTime();
        self.timerID = window.setTimeout( self.callback, self.delay );
        console.log( 'Resuming the timer. Time left:', self.delay );
    }


    /********************* CONSTRUCTOR METHOD *********************/

    /**
     * Private constructor
     * Not a language construct.
     * Mind var to keep the function private and () to execute it right away.
     */
    var __construct = function() {
        self.starttime = new Date().getTime();
        self.timerID = window.setTimeout( self.callback, self.delay )
    }();    /* END __construct */

}   /* END Timer */

例：

var timer = new Timer( function(){ console.log( 'hey! this is a timer!' ); }, 10000 );
timer.pause();

要测试代码，请使用timer.resume()和timer.pause()几次，并检查还剩下多少时间。（确保您的控制台已打开。）

到位的setTimeout（）的使用对象是一样容易更换timerID = setTimeout( mycallback, 1000)用timer = new Timer( mycallback, 1000 )。然后timer.pause()，timer.resume()您可以使用。

function delay (ms)   {  return new Promise(resolve => setTimeout(resolve, s));  }

“异步”工作演示，网址： zarsoft.info

基于评分最高的答案的打字稿实现

/** Represents the `setTimeout` with an ability to perform pause/resume actions */
export class Timer {
    private _start: Date;
    private _remaining: number;
    private _durationTimeoutId?: NodeJS.Timeout;
    private _callback: (...args: any[]) => void;
    private _done = false;
    get done () {
        return this._done;
    }

    constructor(callback: (...args: any[]) => void, ms = 0) {
        this._callback = () => {
            callback();
            this._done = true;
        };
        this._remaining = ms;
        this.resume();
    }

    /** pauses the timer */
    pause(): Timer {
        if (this._durationTimeoutId && !this._done) {
            this._clearTimeoutRef();
            this._remaining -= new Date().getTime() - this._start.getTime();
        }
        return this;
    }

    /** resumes the timer */
    resume(): Timer {
        if (!this._durationTimeoutId && !this._done) {
            this._start = new Date;
            this._durationTimeoutId = setTimeout(this._callback, this._remaining);
        }
        return this;
    }

    /** 
     * clears the timeout and marks it as done. 
     * 
     * After called, the timeout will not resume
     */
    clearTimeout() {
        this._clearTimeoutRef();
        this._done = true;
    }

    private _clearTimeoutRef() {
        if (this._durationTimeoutId) {
            clearTimeout(this._durationTimeoutId);
            this._durationTimeoutId = undefined;
        }
    }

}

您可以像下面那样在服务器端使setTimeout暂停（Node.js）

const PauseableTimeout = function(callback, delay) {
    var timerId, start, remaining = delay;

    this.pause = function() {
        global.clearTimeout(timerId);
        remaining -= Date.now() - start;
    };

    this.resume = function() {
        start = Date.now();
        global.clearTimeout(timerId);
        timerId = global.setTimeout(callback, remaining);
    };

    this.resume();
};

你可以检查它如下

var timer = new PauseableTimeout(function() {
    console.log("Done!");
}, 3000);
setTimeout(()=>{
    timer.pause();
    console.log("setTimeout paused");
},1000);

setTimeout(()=>{
    console.log("setTimeout time complete");
},3000)

setTimeout(()=>{
    timer.resume();
    console.log("setTimeout resume again");
},5000)

我认为您找不到比clearTimeout更好的东西。无论如何，您总是可以在以后安排另一个超时，而不是“继续”。

如果要隐藏多个div，则可以使用setInterval和一个循环来执行以下操作：

<div id="div1">1</div><div id="div2">2</div>
<div id="div3">3</div><div id="div4">4</div>
<script>
    function hideDiv(elm){
        var interval,
            unit = 1000,
            cycle = 5,
            hide = function(){
                interval = setInterval(function(){
                    if(--cycle === 0){
                        elm.style.display = 'none';
                        clearInterval(interval);
                    }
                    elm.setAttribute('data-cycle', cycle);
                    elm.innerHTML += '*';
                }, unit);
            };
        elm.onmouseover = function(){
            clearInterval(interval);
        };
        elm.onmouseout = function(){
            hide();
        };
        hide();
    }
    function hideDivs(ids){
        var id;
        while(id = ids.pop()){
            hideDiv(document.getElementById(id));
        }
    }
    hideDivs(['div1','div2','div3','div4']);
</script>