如何在Angular 5中执行计时器

问题描述

我正在使用Angular 5.

I'm using Angular 5.

我想知道如何从按下播放"按钮开始计时，以了解自单击以来已经过去了多少时间.

I want to know how can I start timing when a 'play' button is pressed, in order to know how much time has passed since I clicked.

我还想知道是否有可能停止计时器，然后能够与之前的相同时间继续.

I'd also like to know if it's possible to stop the timer and then be able to continue with the same time before.

我终于用Pardeep Jain的答案解决了我的问题.尽管这不是我要找的东西.我不想倒数，我想计算持续时间.这是我最后使用的代码:

I've finally solved my question with Pardeep Jain answer. Athough it wasn't exactly what I was looking for.I didn't want a countdown, I wanted to count the duration. Here is the code I've used at the end:

time: number = 0;
interval;

startTimer() {
  this.play = true;
  this.interval = setInterval(() => {
    this.time++;
  },1000)
}

pauseTimer() {
  this.play = false;
  clearInterval(this.interval);
}

推荐答案

您可以简单地使用setInterval在Angular中创建此类计时器，将此代码用于计时器-

You can simply use setInterval to create such timer in Angular, Use this Code for timer -

timeLeft: number = 60;
  interval;

startTimer() {
    this.interval = setInterval(() => {
      if(this.timeLeft > 0) {
        this.timeLeft--;
      } else {
        this.timeLeft = 60;
      }
    },1000)
  }

  pauseTimer() {
    clearInterval(this.interval);
  }

<button (click)='startTimer()'>Start Timer</button>
<button (click)='pauseTimer()'>Pause</button>

<p>{{timeLeft}} Seconds Left....</p>

工作示例

使用Observable计时器的另一种方式，如下所示-

Working Example

Another way using Observable timer like below -

import { timer } from 'rxjs';

observableTimer() {
    const source = timer(1000, 2000);
    const abc = source.subscribe(val => {
      console.log(val, '-');
      this.subscribeTimer = this.timeLeft - val;
    });
  }

<p (click)="observableTimer()">Start Observable timer</p> {{subscribeTimer}}

工作示例

有关更多信息，在此处阅读

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