CSS3实现loading(加载)动画效果

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<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>CSS3实现loading(加载)动画效果</title></head><style>.spinner {  margin: 100px auto;  width: 50px;  height: 60px;  text-align: center;  font-size: 10px;} .spinner > div {  background-color: #f00;  height: 100%;  width: 6px;  display: inline-block;  -webkit-animation: stretchdelay 1.2s infinite ease-in-out;  animation: stretchdelay 1.2s infinite ease-in-out;} .spinner .rect2 {  -webkit-animation-delay: -1.1s;  animation-delay: -1.1s;} .spinner .rect3 {  -webkit-animation-delay: -1.0s;  animation-delay: -1.0s;} .spinner .rect4 {  -webkit-animation-delay: -0.9s;  animation-delay: -0.9s;} .spinner .rect5 {  -webkit-animation-delay: -0.8s;  animation-delay: -0.8s;} @-webkit-keyframes stretchdelay {  0%, 40%, 100% { -webkit-transform: scaleY(0.4) }   20% { -webkit-transform: scaleY(1.0) }} @keyframes stretchdelay {  0%, 40%, 100% {    transform: scaleY(0.4);    -webkit-transform: scaleY(0.4);  }  20% {    transform: scaleY(1.0);    -webkit-transform: scaleY(1.0);  }}</style><body><div class="spinner">  <div class="rect1"></div>  <div class="rect2"></div>  <div class="rect3"></div>  <div class="rect4"></div>  <div class="rect5"></div></div></body></html>