在 Javascript 中的 while 循环内创建暂停 [英] Create a pause inside a while loop in Javascript

问题描述

我想在 while 循环中创建一个暂停，这样我就可以创建 n 个动画，每个动画间隔 3 秒出现.

I would like to create a pause inside a while loop so that I can create n animations that each appear 3 seconds after the other.

我尝试了以下方法，但没有用.希望有人告诉我我做错了什么.

I've tried the following, but it doesn't work. Would love to have someone show me what I'm doing wrong.

i=0;
while (i < n) {
    someanimation();
    setTimeout(function(){
        i++;
    }, 3000);
     
};

推荐答案

setTimeout 不暂停；它要求 Javascript 稍后运行一些其他代码.

setTimeout does not pause; it asks Javascript to run some other code later.

谷歌搜索setTimeout 循环"；准确地告诉您您需要知道的内容.如果你环顾四周，它甚至提到了 setInterval.区别:使用 setTimeout 循环将在循环之间等待 3 秒，而 setInterval 将使循环总共花费 3 秒(包括动画花费的时间，只要它少于 3 秒:)).此外， setInterval 构造了一个无限循环，您必须在所需的次数后跳出；setTimeout 需要您自己构建循环.

Googling for "setTimeout loop" tells you exactly what you need to know. If you look around a little bit, it even mentions setInterval. The difference: using setTimeout to loop will wait 3 seconds in between loops, whereas setInterval will make it take 3 seconds total for the loop (including however much time the animation takes, as long as it's less than 3 seconds :) ). Also, setInterval constructs an infinite loop that you'll have to break out of after the desired number of times; setTimeout requires you to construct the loop yourself.

i = 0;

// setTimeout approach
function animation_loop() {
  someAnimation();
  setTimeout(function() {
    i++;
    if (i < n) {
      animation_loop();
    }
  }, 3000);
};
animation_loop();

// setInterval approach
i = 0;
someAnimation();
iid = setInterval(function() {
  i++;
  if (i < n) {
    someAnimation();
  } else {
    clearInterval(iid);
  }
}, 3000);

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