javascript - 按下下一张幻灯片按钮时如何为屏幕上的幻灯片设置动画？

Question

我正在处理的页面上有一个视频 slider ，但我希望在切换幻灯片时出现漂亮的动画，而不是仅仅切换到下一张幻灯片。例如，设置幻灯片离开屏幕一侧和下一张幻灯片从另一侧进入的动画效果。

var slideIndex = 1;
		showDivs(slideIndex);

		function plusDivs(n) {
  			showDivs(slideIndex += n);
		}

		function showDivs(n) {
  			var i;
  			var x = document.getElementsByClassName("mySlides");
  			if (n > x.length) {slideIndex = 1}    
  			if (n < 1) {slideIndex = x.length}
  				for (i = 0; i < x.length; i++) {
     					x[i].style.display = "none";  
  				}
  			x[slideIndex-1].style.display = "block";  
		}

<div class="video__container" style="display: flex; display: -webkit-flex; flex-direction: row; -webkit-flex-direction: row;">
			<div class="arrow__container">
				<div class="video__container--arrow arrow__back" onclick="plusDivs(-1)">
					<img class="img__full" src="css/images/template_arrow.svg">
				</div>
			</div>
		
			<div class="video__container--item">
				<!-- Must include data-id, data-bg and optional video name -->
				<div class="video__slide mySlides">
					<div class="youtube-container template-youtube-container">
		   				<div class="youtube-player" data-id="bqlzoxTvOkE" data-bg="css/images/pb/video1.jpg"><span class="video-name">Branding</span></div>
					</div>
				</div>
				<div class="video__slide mySlides">
					<div class="youtube-container template-youtube-container">
		   				<div class="youtube-player" data-id="S-sJp1FfG7Q" data-bg="css/images/pb/video2.jpg"><span class="video-name">UX Design</span></div>
					</div>
  				</div>
  				<div class="video__slide mySlides">
					<div class="youtube-container template-youtube-container">
		   				<div class="youtube-player" data-id="zVntJ21thpQ" data-bg="css/images/pb/video3.jpg"><span class="video-name">UI Design</span></div>
					</div>
  				</div>

			</div>
			
			<div class="arrow__container">
				<div class="video__container--arrow arrow__next" onclick="plusDivs(1)">
  					<img class="img__full" src="css/images/template_arrow.svg">
  				</div>
  			</div>
		</div>

Answer 1

好的，是的，很多，但我们在这里做的是避免 JavaScript 缓动动画。如果您确实想使用缓动，请使用以下链接，因为我无法像这样解释它。 https://www.kirupa.com/html5/introduction_to_easing_in_javascript.htm如果你仍然想跳过整个 easing 的学习过程(像我一样)，有一种方法可以绕过它。我会给你一个简短的版本，如果你仍然感到困惑，我有一个很好的、很长的例子。首先，您必须制作一个 div 容器来容纳您的幻灯片。基本上，您将使用 JavaScript 函数为该容器分配一个类。除第一张和最后一张幻灯片外，您将为每张幻灯片制作两张幻灯片(一张向前，一张向后)。当你这样做时，确保通过分配另一个类作为空值来重置动画，否则......你刚刚创建的那些类将保存动画，但在空类中除外。添加您的动画、一些样式和 html，确保包含一个具有之前功能的按钮。我的非常简单，但您真的可以随心所欲地装饰它。

/*This is the Javascript. What we are doing here is bypassing the complexity of
Javascript animations and instead changing the class of what we want to move.
This allows us to still use the onclick function in our html, while at 
the same time using css3 animations*/
function magicbtnf() {
  document.getElementById('container').className = "magicslide";
}

function magicbtnb() {
  document.getElementById('container').className = "magicslide2";
}

/*This is css. Most of it is styling, but I will point out importants in 
comments.*/

body,
html {
  width: 100%;
  margin: 0;
  border: 0;
  font-family: "century gothic", "Arial";
  font-size: 18px;
}

#container {
  /*This is the container, make it 100% x the number of slides you have.
	This will allow each slide to fill 100% of the screen*/
  width: 200%;
  overflow: hidden;
  position: fixed;
  display: flex;
}

#container>div {
  display: inline-block;
  text-align: center;
  vertical-align: top;
}

#slide1 {
  /* You can insert your first slide CSS in here , just make sure the width
	is 1/the amount of slides you have. % is recommended, but I'm sure there
	is a way to use vw.*/
  height: 400px;
  width: 50%;
  background-color: red;
  float: right;
  position: relative;
}

.magicslide {
  /*This is one of two classes for the animation. We will use javascript to
	set and unset the classes to the slides*/
  -webkit-animation: switch 4s 1;
  -o-animation: switch 4s 1;
  -moz-animation: switch 4s 1;
  animation: switch 4s 1;
  animation-fill-mode: forwards;
  -webkit-animation-fill-mode: forwards;
  -moz-animation-fill-mode: forwards;
  -o-animation-fill-mode: forwards;
}

@-moz-keyframes switch {
  0% {
    margin-left: 0px;
  }
  25% {
    margin-left: 0px;
  }
  50% {
    margin-left: -60%;
  }
  100% {
    margin-left: -100%;
  }
}

@-o-keyframes switch {
  0% {
    margin-left: 0px;
  }
  25% {
    margin-left: 0px;
  }
  50% {
    margin-left: -60%;
  }
  100% {
    margin-left: -100%;
  }
}

@-webkit-keyframes switch {
  0% {
    margin-left: 0px;
  }
  25% {
    margin-left: 0px
  }
  50% {
    margin-left: -60%;
  }
  100% {
    margin-left: -100%;
  }
}

@keyframes switch {
  0% {
    margin-left: 0px;
  }
  25% {
    margin-left: 0px
  }
  50% {
    margin-left: -60%;
  }
  100% {
    margin-left: -100%;
  }
}

.notsomagic {
  /*This is basically a void element. This resets the animation so when
	you go back a slide, you can continue again.*/
  height: 400px;
  width: 100%;
}

#slide2 {
  /*Same thing here as the earlier slide!*/
  height: 400px;
  width: 50%;
  background-color: lightblue;
  float: left;
  position: relative;
}

.magicslide2 {
  /*This is the same animation sequence as before, but backwards*/
  -webkit-animation: switchb 4s 1;
  -o-animation: switchb 4s 1;
  -moz-animation: switchb 4s 1;
  animation: switchb 4s 1;
  animation-fill-mode: forwards;
  -webkit-animation-fill-mode: forwards;
  -moz-animation-fill-mode: forwards;
  -o-animation-fill-mode: forwards;
}

@keyframes switchb {
  0% {
    margin-left: -100%;
  }
  25% {
    margin-left: -100%;
  }
  50% {
    margin-left: -40%
  }
  100% {
    margin-left: 0%;
  }
}

@-moz-keyframes switchb {
  0% {
    margin-left: -100%;
  }
  25% {
    margin-left: -100%;
  }
  50% {
    margin-left: -40%
  }
  100% {
    margin-left: 0%;
  }
}

@-o-keyframes switchb {
  0% {
    margin-left: -100%;
  }
  25% {
    margin-left: -100%;
  }
  50% {
    margin-left: -40%
  }
  100% {
    margin-left: 0%;
  }
}

@-webkit-keyframes switchb {
  0% {
    margin-left: -100%;
  }
  25% {
    margin-left: -100%;
  }
  50% {
    margin-left: -40%
  }
  100% {
    margin-left: 0%;
  }
}

<!--This is just some boring old html. It's esentially placing everything where it needs to go. The most noticable part is the input, which states our function from the javascript onclick -->
<!DOCTYPE html>
<html>

<head>
  <title>Slide</title>
  <link rel="stylesheet" type="text/css" href="change_slides.css">
  <script type="text/javascript" src="change_slides.js"></script>
</head>

<body>
  <div id="container">
    <div id="slide1">
      Hello! This is my slideshow!
      <br>
      <input type="button" id="change" value="Click Me!" onclick="magicbtnf()">
    </div>
    <div id="slide2">
      This is slide #2!
      <br>
      <input type="button" id="change2" value="Click Me Too!" onclick="magicbtnb()">
    </div>
  </div>
</body>

</html>

如果您不想制作自己的动画，可以免费下载。我推荐 Animate.css。它充满了非常流畅的动画，通过一些快速编辑，您可以使它们与您的幻灯片放映效果非常好。链接是:https://daneden.github.io/animate.css/我希望这有帮助! :D