如何实现一个loading动画效果

[artdong]

如何实现一个loading动画效果

[artdong]

svg实现loading效果

效果

思路：通过svg实现动画效果，通过svg的width、height属性控制大小，通过path的fill属性控制颜色。

html

<svg version="1.1" id="L9" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
  viewBox="0 0 100 100" enable-background="new 0 0 0 0" xml:space="preserve">
    <path fill="#fff" d="M73,50c0-12.7-10.3-23-23-23S27,37.3,27,50 M30.9,50c0-10.5,8.5-19.1,19.1-19.1S69.1,39.5,69.1,50">
      <animateTransform 
         attributeName="transform" 
         attributeType="XML" 
         type="rotate"
         dur="1s" 
         from="0 50 50"
         to="360 50 50" 
         repeatCount="indefinite" />
  </path>
</svg>

css

svg {
  width: 100px;
  height: 100px;
}

svg path {
  fill: lightgreen;
}

animation实现loading效果

效果

思路：animation控制图形元素进行transform:rotate()。

html

<div class="loader">
  <div class="line-spin-fade-loader">
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
  </div>
</div>

css

.loader {
    display: flex;
    max-width: 20%;
    height: 100px;
    align-items: center;
    justify-content: center;
    }

.line-spin-fade-loader {
  position: relative;
}

.line-spin-fade-loader > div:nth-child(1) {
  top: 20px;
  left: 0;
  -webkit-animation: line-spin-fade-loader 1.2s 0.12s infinite ease-in-out;
  animation: line-spin-fade-loader 1.2s 0.12s infinite ease-in-out;
}

.line-spin-fade-loader > div:nth-child(2) {
  top: 13.63636px;
  left: 13.63636px;
  -webkit-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  transform: rotate(-45deg);
  -webkit-animation: line-spin-fade-loader 1.2s 0.24s infinite ease-in-out;
  animation: line-spin-fade-loader 1.2s 0.24s infinite ease-in-out;
}

.line-spin-fade-loader > div:nth-child(3) {
  top: 0;
  left: 20px;
  -webkit-transform: rotate(90deg);
  -ms-transform: rotate(90deg);
  transform: rotate(90deg);
  -webkit-animation: line-spin-fade-loader 1.2s 0.36s infinite ease-in-out;
  animation: line-spin-fade-loader 1.2s 0.36s infinite ease-in-out;
}

.line-spin-fade-loader > div:nth-child(4) {
  top: -13.63636px;
  left: 13.63636px;
  -webkit-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  transform: rotate(45deg);
  -webkit-animation: line-spin-fade-loader 1.2s 0.48s infinite ease-in-out;
  animation: line-spin-fade-loader 1.2s 0.48s infinite ease-in-out;
}

.line-spin-fade-loader > div:nth-child(5) {
  top: -20px;
  left: 0;
  -webkit-animation: line-spin-fade-loader 1.2s 0.6s infinite ease-in-out;
  animation: line-spin-fade-loader 1.2s 0.6s infinite ease-in-out;
}

.line-spin-fade-loader > div:nth-child(6) {
  top: -13.63636px;
  left: -13.63636px;
  -webkit-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  transform: rotate(-45deg);
  -webkit-animation: line-spin-fade-loader 1.2s 0.72s infinite ease-in-out;
  animation: line-spin-fade-loader 1.2s 0.72s infinite ease-in-out;
}

.line-spin-fade-loader > div:nth-child(7) {
  top: 0;
  left: -20px;
  -webkit-transform: rotate(90deg);
  -ms-transform: rotate(90deg);
  transform: rotate(90deg);
  -webkit-animation: line-spin-fade-loader 1.2s 0.84s infinite ease-in-out;
  animation: line-spin-fade-loader 1.2s 0.84s infinite ease-in-out;
}

.line-spin-fade-loader > div:nth-child(8) {
  top: 13.63636px;
  left: -13.63636px;
  -webkit-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  transform: rotate(45deg);
  -webkit-animation: line-spin-fade-loader 1.2s 0.96s infinite ease-in-out;
  animation: line-spin-fade-loader 1.2s 0.96s infinite ease-in-out;
}

.line-spin-fade-loader > div {
  background-color: lightgreen;
  width: 4px;
  height: 35px;
  border-radius: 2px;
  margin: 2px;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
  position: absolute;
  width: 5px;
  height: 15px;
}

更多实现方法，敬请各位大神分享。