悬停时的连续动画（性能） [英] Continuous animation on hover (performance)

问题描述

我创建了一个jQuery函数，通过减少元素的左边距来滚动DIV。它有效，但速度非常慢。它立刻吃掉了100％的CPU：s

I've created a jQuery function that scrolls a DIV by decreasing the left-margin of the element. It works, but it's incredibly slow. It eats up 100% CPU in no time :s

$(".scroll").hover(
    function () {
        var scroll_offset = parseInt($('#content').css('margin-left'));
        sliderInt = self.setInterval(function(){
            $content.css({'margin-left':scroll_offset+'px'});
            scroll_offset--;
        },8);
    }, 
    function () {
        clearInterval(sliderInt);
    }
);

显然我每8ms运行一次这个函数，这是很多问题。我已经缓存了我的选择器，所以我不知道我能做些什么来提高性能。我只是错误的方式吗？

Obviously I am running this function every 8ms, which is asking a lot. I'm already cacheing my selectors, so I don't know what I can do to improve performance. Am I just going about it the wrong way?

推荐答案

function play () {
  $('#ball').animate({left: '+=20'}, 100, 'linear', play);
}

function pause () {
  $('#ball').stop();
}

$("#bar").hover( play, pause );

#bar {
  margin-top: 20px;
  background: #444;
  height: 20px;
}
#bar:hover #ball {
  background: lightgreen;
}

#ball {
  position: relative;
  left: 0;
  width: 20px;
  height: 20px;
  background: red;
  border-radius: 50%;
}

<div id="bar">
  <div id="ball"></div>
</div>

<script src="//code.jquery.com/jquery-3.1.0.js"></script>

这是真正的简单没有setInterval甚至是setTimeout。

This is really simple without the setInterval or even setTimeout.

• 唯一重要的是知道 .animate（）接受函数回调，非常适合我们创建循环函数的目的。确保使用线性缓动而不是默认的'swing'来使我们的循环保持不变。


• 要停止我们的动画，我们可以使用 stop（）来阻止动画构建。


• 只需创建2个函数并在 hover <中使用它们/ code>方法。



• The only important thing is to know that .animate() accepts a function callback, ideal for our purpose to create loop a function. Make sure to use the linear easing instead of the default 'swing' to make our loop constant.
• To stop our animations we can use stop() to prevent animation buildups.
• Simply create 2 functions and use them in your hover method.

并使用jQuery切换播放/暂停类：

and toggling play/pause classes using jQuery:

function play() {
  $('#ball').addClass("play").removeClass("pause");
}

function pause() {
  $('#ball').addClass("pause"); // don't remove .play here
}

$("#bar").hover(play, pause);

#bar {
  margin-top: 20px;
  background: #444;
  height: 20px;
}
#bar:hover #ball {
  background: lightgreen;
}
#ball {
  position: relative;
  left: 0;
  width: 20px;
  height: 20px;
  background: red;
  border-radius: 50%;
}

.play {
  animation: ball-anim 5s infinite linear;
}
.pause {
  animation-play-state: paused;
}
@keyframes ball-anim {
  0%   { left: 0; }
  50%  { left: calc(100% - 20px); }
  100% { left: 0; }
}

<div id="bar">
  <div id="ball"></div>
</div>

<script src="//code.jquery.com/jquery-3.1.0.js"></script>

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