SOURCE

new Vue({
  el: '#example-1',
  data: {
    show: true
  }
})

<div id="example-1">
  <button @click="show = !show">
    Toggle render
  </button>
  <transition name="slide-fade">
    <p v-if="show">hello</p>
  </transition>
</div>

/* 可以设置不同的进入和离开动画 */
/* 设置持续时间和动画函数 */
.slide-fade-enter-active {
  transition: all .3s ease;
}
.slide-fade-leave-active {
  transition: all .8s cubic-bezier(1.0, 0.5, 0.8, 1.0);
}
.slide-fade-enter, .slide-fade-leave-active {
  transform: translateX(10px);
  opacity: 0;
}
p{
  border:1px solid ;
  width:100px;
  height:100px;
  text-align:center;
  line-height:100px;
  border-radius:50px;
}