只用一个动画类来回无缝过渡？

Question

我想使用一个类来触发动画，并在删除该类后重新反映该动画。

很难想象，所以我创建了CodePen of where I'm at currently.

您注意到.zoom从#box移除后，#box就会消失。它没有反向动画，这最终是目标。

如何只使用一个动画类来无缝地来回转换？通常我可能会使用过渡，但你无法通过变换进行过渡。

Answer 1

尝试添加.zoomout class，css动画，利用.removeClass()，class .toggleClass()

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window.onclick = function() {
  if (!$("#box").is(".zoom")) {
    $("#box").removeClass("zoomout")
      .toggleClass("zoom");
  } else {
    $("#box").toggleClass("zoom zoomout");
  }
};

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#box {
  width: 256px;
  height: 256px;
  background: black;
  opacity: 0;
  display: block;
  transform: scale(1.15, 1.15);
  margin: 16px 0px;
}
.zoom {
  animation: zoom 500ms;
  animation-fill-mode: both;
  -moz-animation: zoom 500ms;
  -moz-animation-fill-mode: both;
  -webkit-animation: zoom 500ms;
  -webkit-animation-fill-mode: both;
}
.zoomout {
  animation: zoomout 500ms;
  animation-fill-mode: both;
  -moz-animation: zoomout 500ms;
  -moz-animation-fill-mode: both;
  -webkit-animation: zoomout 500ms;
  -webkit-animation-fill-mode: both;
}
@keyframes zoom {
  0% {
    opacity: 0;
    transform: scale(1.15);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}
@-moz-keyframes zoom {
  0% {
    opacity: 0;
    transform: scale(1.15);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}
@-webkit-keyframes zoom {
  0% {
    opacity: 0;
    transform: scale(1.15);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}
@keyframes zoomout {
  0% {
    opacity: 1;
    transform: scale(1.15);
  }
  100% {
    opacity: 0;
    transform: scale(1);
  }
}
@-moz-keyframes zoomout {
  0% {
    opacity: 1;
    transform: scale(1.15);
  }
  100% {
    opacity: 0;
    transform: scale(1);
  }
}
@-webkit-keyframes zoomout {
  0% {
    opacity: 1;
    transform: scale(1.15);
  }
  100% {
    opacity: 0;
    transform: scale(1);
  }
}
body {
  margin: 0;
  text-align: center;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -60%);
  -moz-transform: translate(-50%, -60%);
  -webkit-transform: translate(-50%, -60%);
}

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<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js">
</script>
<div id="box"></div>
Click the document to toggle the box.

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codepen http://codepen.io/anon/pen/vOxxKE