<transition name="slide-fade">
  <p v-if="show"> hello world </p>
</transition>

/* 可以設(shè)置不同的進(jìn)入和離開動(dòng)畫 */
/* 設(shè)置持續(xù)時(shí)間和動(dòng)畫函數(shù) */
.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-to
  transform: translateX(10px);
  opacity: 0;
}

<div id="example-2">
  <button @click="show = !show">Toggle show</button>
  <transition name="bounce">
    <p v-if="show">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris facilisis enim libero, at lacinia diam fermentum id. Pellentesque habitant morbi tristique senectus et netus.</p>
  </transition>
</div>

.bounce-enter-active {
  animation: bounce-in .5s;
}
.bounce-leave-active {
  animation: bounce-in .5s reverse;
}
@keyframes bounce-in {
  0% {
    transform: scale(0);
  }
  50% {
    transform: scale(1.5);
  }
  100% {
    transform: scale(1);
  }
}

  methods: {
    beforeEnter: function (el) {
      el.style.opacity = 0
      el.style.transformOrigin = 'left'
    },
    enter: function (el, done) {
      Velocity(el, { opacity: 1, fontSize: '1.4em' }, { duration: 300 })
      Velocity(el, { fontSize: '1em' }, { complete: done })
    },
    leave: function (el, done) {
      Velocity(el, { translateX: '15px', rotateZ: '50deg' }, { duration: 600 })
      Velocity(el, { rotateZ: '100deg' }, { loop: 2 })
      Velocity(el, {
        rotateZ: '45deg',
        translateY: '30px',
        translateX: '30px',
        opacity: 0
      }, { complete: done })
    }
  }

<div id="example-2">
  <transition name="fade" mode="out-in">
    <button v-if="isEditing" key="save"
            @click="isEditing=!isEditing">
      Save
    </button>
    <button v-else key="edit"
             @click="isEditing=!isEditing">
      Edit
    </button>
  </transition>
</div>

.fade-enter-active, .fade-leave-active {
  transition: all 1s;
}
.fade-enter {
  opacity: 0;
  transform: translateX(50px);
}
.fade-leave-to {
  opacity: 0;
  transform: translateX(-50px);
}

#example-2{
  position: relative;
  padding: 100px;
}
#example-2 button {
  position: absolute;
}

  <transition-group name="list" tag="p">
    <span v-for="item in items" v-bind:key="item" class="list-item">
      {{ item }}
    </span>
  </transition-group>