Vue实现过渡效果的基本方法

<template>
  <div>
    <button @click="show = !show">
      Toggle render
    </button>
    <transition name="fade">
      <div v-if="show">Hello, Vue Transition!</div>
    </transition>
  </div>
</template>

<script setup>
import { ref } from 'vue';

const show = ref(false);
</script>

<style>
.fade-enter-active, .fade-leave-active {
  transition: opacity 0.5s;
}
.fade-enter-from, .fade-leave-to {
  opacity: 0;
}
</style>

<template>
  <div>
    <button @click="add">Add</button>
    <button @click="remove">Remove</button>
    <transition-group name="list">
      <div v-for="item in items" :key="item" class="list-item">
        {{ item }}
      </div>
    </transition-group>
  </div>
</template>

<script setup>
import { ref } from 'vue';

const items = ref([1, 2, 3, 4, 5]);
const nextItem = ref(6);

function add() {
  nextItem.value++;
  items.value.push(nextItem.value);
}

function remove() {
  items.value.pop();
}
</script>

<style>
.list-item {
  transition: all 0.5s ease;
  display: inline-block;
  margin-right: 10px;
}
.list-enter-active, .list-leave-active {
  transition: all 0.5s ease;
}
.list-enter-from, .list-leave-to {
  transform: translateY(30px);
  opacity: 0;
}
.list-move {
  transition: all 0.5s ease;
}
</style>

<template>
  <div>
    <button @click="show = !show">
      Toggle render
    </button>
    <transition
      :name="transitionName"
      @before-enter="beforeEnter"
      @enter="enter"
      @after-enter="afterEnter"
    >
      <div v-if="show">Hello, Vue Transition Hooks!</div>
    </transition>
  </div>
</template>

<script setup>
import { ref } from 'vue';

const show = ref(false);
const transitionName = ref('fade');

const beforeEnter = (el) => {
  el.style.opacity = 0;
};

const enter = (el, done) => {
  el.offsetHeight;
  el.style.opacity = 1;
  done();
};

const afterEnter = (el) => {
    console.log('Transition entered');
  };
</script>

<style>
.fade-enter-active, .fade-leave-active {
  transition: opacity 0.5s;
}
.fade-enter-from, .fade-leave-to {
  opacity: 0;
}
</style>