css动画

css实现一些特殊的动画效果。

打字动画

实现：

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@keyframes typing {
  from {
    width: 0;
  }
}

@keyframes caret {
  50% {
    border-right-color: transparent;
  }
}

h1 {
  width: 15ch;
  white-space: nowrap;
  overflow: hidden;
  border-right: 0.05em solid;
  animation: typing 8s steps(15), caret 1s steps(1) infinite;
}
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<h1>CSS is awesome!</h1>

环形旋转动画

实现：

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@keyframes spin {
  from {
    transform: rotate(0turn) translateY(-150px) translateY(50%) rotate(1turn);
  }
  to {
    transform: rotate(1turn) translateY(-150px) translateY(50%) rotate(0turn);
  }
}

.item {
  animation: spin 3s infinite linear;
}

.item {
  display: block;
  width: 50px;
  margin: calc(50% - 25px) auto 0;
  border-radius: 50%;
  overflow: hidden;
}

.box {
  width: 300px;
  height: 300px;
  padding: 20px;
  border-radius: 50%;
  background: #fb3;
}
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<div class="box">
  <img src="http://lea.verou.me/book/adamcatlace.jpg" class="item" />
</div>
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