Vue3 + Vue Router 4.x 添加transition报错

1. 报错信息

2. 报错原因

检查页面代码发现动效出错页面为多根节点，修改后动效正常

<template>
  <div>
    <div>xxx</div>
  </div>
</template>

3. 动效添加

<router-view v-slot="{ Component }">
  <transition name="fade-slide" mode="out-in" appear>
    <component :is="Component" />
  </transition>
</router-view>

/* router view transition fade-slide */
.fade-slide-leave-active,
.fade-slide-enter-active {
  transition: all 0.3s;
}
.fade-slide-enter-from {
  opacity: 0;
  transform: translateX(-30px);
}
.fade-slide-leave-to {
  opacity: 0;
  transform: translateX(30px);
}

.fade-enter-active {
  transition: opacity 0.5s;
}
.fade-leave-active {
  transition: none;
}
.fade-enter,
.fade-leave-to {
  opacity: 0;
}

Vue 可能会自动复用看起来相似的组件，可以通过添加一个 key 属性来强制过渡。