如何使用 JavaScript 暂停和恢复 CSS3 动画?

问题描述：

我试过谷歌搜索并从这个论坛中寻找解决我的问题的方法，但到目前为止还没有运气.我想通过单击图片来暂停我的 CSS3 动画(图像幻灯片)，并通过单击图片恢复到相同的动画.

I've tried to google and look from this forum a solution for my problem but no luck so far. I would like to pause my CSS3 animation (image slide show) by clicking a picture and also resume to the same animation by clicking a picture.

我知道如何暂停幻灯片放映，我也能够恢复它一次，但是如果尝试暂停和恢复一次以上，它就会停止工作.这是我的代码的样子:

I know how to pause the slide show and I was also able to resume it once, but then it stops working if try to pause and resume more than one time. Here is how my code looks like:

<!DOCTYPE html>
<html>

<head>
<title></title>
<style type="text/css">
.pic {
    position: absolute;
    opacity: 0;
}

#pic1 {
    -webkit-animation: pic1 4s infinite linear;
}

#pic2 {
    -webkit-animation: pic2 4s infinite linear;
}

@-webkit-keyframes pic1 {
    0%   {opacity: 0;}
    5%   {opacity: 1;}
    45%  {opacity: 1;}
    50%  {opacity: 0;}
    100% {opacity: 0;}
}

@-webkit-keyframes pic2 {
    0%   {opacity: 0;}
    50%  {opacity: 0;}
    55%  {opacity: 1;}
    95%  {opacity: 1;}
    100% {opacity: 0;}
}
</style>

<script type="text/javascript">
function doStuff(){
    var pic1 = document.getElementById("pic1");
    var pic2 = document.getElementById("pic2");

    pic1.style.webkitAnimationPlayState="paused";
    pic2.style.webkitAnimationPlayState="paused";

    pic1.onclick = function(){
        pic1.style.webkitAnimationPlayState="running";
        pic2.style.webkitAnimationPlayState="running";
    }

    pic2.onclick = function(){
        pic1.style.webkitAnimationPlayState="running";
        pic2.style.webkitAnimationPlayState="running";
    }
}
</script>
</head>  

<body>
    <img id="pic1" class="pic" src="photo1.jpg" />
    <img id="pic2" class="pic" src="photo2.jpg" onclick="doStuff()" />
</body>                                                                

</html>

我不想使用任何 JS 库(例如 jQuery)或任何其他外部解决方案.

I don't want to use any JS libraries (e.g. jQuery) or any other external solution.

我的猜测是 doStuff 函数中的函数仍在运行，这就是 pause 和 resume 只工作一次的原因.

My guess is that my functions inside doStuff function are still running and that's why pause and resume works only once.

有没有办法在我点击一次后清除这些功能?还是我试图以完全错误的方式做到这一点?帮助表示赞赏.:)

Is there a way to clear these functions after I have clicked them once? Or am I trying to do this in a totally wrong way? Help is appreciated. :)

答

这是一个使用 javascript 的解决方案:

Here is a solution using javascript:

var imgs = document.querySelectorAll('.pic');

for (var i = 0; i < imgs.length; i++) {
  imgs[i].onclick = toggleAnimation;
  imgs[i].style.webkitAnimationPlayState = 'running';
}

function toggleAnimation() {
  var style;
  for (var i = 0; i < imgs.length; i++) {
    style = imgs[i].style;
    if (style.webkitAnimationPlayState === 'running') {
      style.webkitAnimationPlayState = 'paused';
      document.body.className = 'paused';
    } else {
      style.webkitAnimationPlayState = 'running';
      document.body.className = '';
    }
  }
}

.pic {
  position: absolute;
  opacity: 0;
}

#pic1 {
  -webkit-animation: pic1 4s infinite linear;
}

#pic2 {
  -webkit-animation: pic2 4s infinite linear;
}

@-webkit-keyframes pic1 {
  0% {
    opacity: 0;
  }
  5% {
    opacity: 1;
  }
  45% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}

@-webkit-keyframes pic2 {
  0% {
    opacity: 0;
  }
  50% {
    opacity: 0;
  }
  55% {
    opacity: 1;
  }
  95% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

.paused {
  background-color: #ddd;
}

<img id="pic1" class="pic" src="http://placehold.it/200x200/ff0000/ffffff">
<img id="pic2" class="pic" src="http://placehold.it/200x200/ff00ff/ffffff">

jQuery 解决方案(更短、更易读):

jQuery solution (shorter and more readable):

var imgs = $('.pic'),
  playState = '-webkit-animation-play-state';

imgs.click(function() {
  imgs.css(playState, function(i, v) {
    return v === 'paused' ? 'running' : 'paused';
  });
  $('body').toggleClass('paused', $(this).css(playState) === 'paused');
});

.pic {
  position: absolute;
  opacity: 0;
}

#pic1 {
  -webkit-animation: pic1 4s infinite linear;
}

#pic2 {
  -webkit-animation: pic2 4s infinite linear;
}

@-webkit-keyframes pic1 {
  0% {
    opacity: 0;
  }
  5% {
    opacity: 1;
  }
  45% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}

@-webkit-keyframes pic2 {
  0% {
    opacity: 0;
  }
  50% {
    opacity: 0;
  }
  55% {
    opacity: 1;
  }
  95% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

.paused {
  background-color: #ddd;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<img id="pic1" class="pic" src="http://placehold.it/200x200/ff0000/ffffff">
<img id="pic2" class="pic" src="http://placehold.it/200x200/ff00ff/ffffff">

如何使用 JavaScript 暂停和恢复 CSS3 动画?

相关推荐