vue中路由过渡的问题？

Question

vue里面给路由添加过场动画淡入淡出效果, 组件在移除时是淡出的，但是在进入时是瞬间进入的，并没有淡入，这两步之间，页面会变空白。下面是我的代码，就是从官网抄的：

<template>
  <div id="app">
    <transition name="fade">
      <router-view></router-view>
    </transition>
  </div>
</template>
.fade-enter-active, .fade-leave-active {
  transition: opacity .3s
}
.fade-enter, .fade-leave-active {
  opacity: 0
}


请问要怎么做才可以在当前组件淡出的同时，将要被插入的组件能淡入。

Answer 1

设置mode为out-in

Answer 2

.fade-enter-active, .fade-leave-active {
  opacity: 1;
  transition: opacity .3s
}
.fade-enter, .fade-leave-active {
  opacity: 0
}

或：

.fade-enter-active, .fade-leave-active {
  opacity: 1;
  transition: opacity .3s
}
.fade-enter, .fade-leave-to {
  opacity: 0;
}

Answer 3

.fade-enter-active, .fade-leave-active {
opacity: 1;
transition: opacity .3s
}
.fade-enter, .fade-leave {
opacity: 0
}