console 命令行工具 X clear

console

new Vue({
  el: '#root',
  data: {
    show: false
  }
})

<div id="root">
  <transition>
    <h1 v-show="show">hello world</h1>
  </transition>
  <button @click="show = !show">toggle</button>
</div>

.v-enter,.v-leave-to {
  opacity:0;
}

.v-enter-active,.v-leave-active {
  transition:opacity 1s;
}