css3实现动画加载效果例子

body {background:#0dcecb;}
.loader,
.loader:before,
.loader:after {
  background: #FFF;
  -webkit-animation: load1 1s infinite ease-in-out;
  animation: load1 1s infinite ease-in-out;
  width: 1em;
  height: 4em;
}
.loader:before,
.loader:after {
  position: absolute;
  top: 0;
  content: '';
}
.loader:before {
  left: -1.5em;
}
.loader {
  text-indent: -9999em;
  margin: 40% auto;
  position: relative;
  font-size: 11px;
  -webkit-animation-delay: 0.16s;
  animation-delay: 0.16s;
}
.loader:after {
  left: 1.5em;
  -webkit-animation-delay: 0.32s;
  animation-delay: 0.32s;
}
@-webkit-keyframes load1 {
  0%,
  80%,
  100% {
    box-shadow: 0 0 #FFF;
    height: 4em;
  }
  40% {
    box-shadow: 0 -2em #ffffff;
    height: 5em;
  }
}
@keyframes load1 {
  0%,
  80%,
  100% {
    box-shadow: 0 0 #FFF;
    height: 4em;
  }
  40% {
    box-shadow: 0 -2em #ffffff;
    height: 5em;
  }
}
.loader2,
.loader2:before,
.loader2:after {
  border-radius: 50%;
}
.loader2:before,
.loader2:after {
  position: absolute;
  content: '';
}
.loader2:before {
  width: 5.2em;
  height: 10.2em;
  background: #0dcecb;
  border-radius: 10.2em 0 0 10.2em;
  top: -0.1em;
  left: -0.1em;
  -webkit-transform-origin: 5.2em 5.1em;
  transform-origin: 5.2em 5.1em;
  -webkit-animation: load2 2s infinite ease 1.5s;
  animation: load2 2s infinite ease 1.5s;
}
.loader2 {
  font-size: 11px;
  text-indent: -99999em;
  margin: 30% auto;
  position: relative;
  width: 10em;
  height: 10em;
  box-shadow: inset 0 0 0 1em #FFF;
}
.loader2:after {
  width: 5.2em;
  height: 10.2em;
  background: #0dcecb;
  border-radius: 0 10.2em 10.2em 0;
  top: -0.1em;
  left: 5.1em;
  -webkit-transform-origin: 0px 5.1em;
  transform-origin: 0px 5.1em;
  -webkit-animation: load2 2s infinite ease;
  animation: load2 2s infinite ease;
}
@-webkit-keyframes load2 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes load2 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

.loader3 {
  font-size: 10px;
  margin: 30% auto;
  text-indent: -9999em;
  width: 11em;
  height: 11em;
  border-radius: 50%;
  background: #ffffff;
  background: -moz-linear-gradient(left, #ffffff 10%, rgba(255, 255, 255, 0) 42%);
  background: -webkit-linear-gradient(left, #ffffff 10%, rgba(255, 255, 255, 0) 42%);
  background: -o-linear-gradient(left, #ffffff 10%, rgba(255, 255, 255, 0) 42%);
  background: -ms-linear-gradient(left, #ffffff 10%, rgba(255, 255, 255, 0) 42%);
  background: linear-gradient(to right, #ffffff 10%, rgba(255, 255, 255, 0) 42%);
  position: relative;
  -webkit-animation: load3 1.4s infinite linear;
  animation: load3 1.4s infinite linear;
}
.loader3:before {
  width: 50%;
  height: 50%;
  background: #FFF;
  border-radius: 100% 0 0 0;
  position: absolute;
  top: 0;
  left: 0;
  content: '';
}
.loader3:after {
  background: #0dcecb;
  width: 75%;
  height: 75%;
  border-radius: 50%;
  content: '';
  margin: auto;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}
@-webkit-keyframes load3 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

.loader4 {
  margin: 6em auto;
  font-size: 10px;
  position: relative;
  text-indent: -9999em;
  border-top: 1.1em solid rgba(255, 255, 255, 0.2);
  border-right: 1.1em solid rgba(255, 255, 255, 0.2);
  border-bottom: 1.1em solid rgba(255, 255, 255, 0.2);
  border-left: 1.1em solid #ffffff;
  -webkit-animation: load8 1.1s infinite linear;
  animation: load8 1.1s infinite linear;
}
.loader4,
.loader4:after {
  border-radius: 50%;
  width: 10em;
  height: 10em;
}
@-webkit-keyframes load8 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes load8 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}