Vue3中Transition和TransitionGroup组件的使用及说明

<template>
  <div>
    <button @click="show = !show">Toggle</button>
    <transition name="fade">
      <div v-if="show" class="box">Hello, Vue 3!</div>
    </transition>
  </div>
</template>

<script>
export default {
  data() {
    return {
      show: false
    };
  }
};
</script>

<style>
.fade-enter-active, .fade-leave-active {
  transition: opacity 0.5s ease;
}
.fade-enter, .fade-leave-to /* .fade-leave-active 在下一个版本 */ {
  opacity: 0;
}
.box {
  padding: 20px;
  background-color: #42b983;
  color: white;
  border-radius: 5px;
}
</style>

<transition
  name="fade"
  @before-enter="beforeEnter"
  @enter="enter"
  @leave="leave"
>
  <div v-if="show" class="box">Hello, Vue 3!</div>
</transition>

<script>
export default {
  methods: {
    beforeEnter(el) {
      el.style.opacity = 0;
    },
    enter(el, done) {
      el.offsetHeight; // 触发重排
      el.style.opacity = 1;
      done();
    },
    leave(el, done) {
      el.style.opacity = 0;
      done();
    }
  }
};
</script>

<template>
  <div>
    <button @click="addItem">Add Item</button>
    <button @click="removeItem">Remove Item</button>
    <transition-group name="list" tag="ul">
      <li v-for="item in items" :key="item" class="list-item">{{ item }}</li>
    </transition-group>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: ['Item 1', 'Item 2', 'Item 3']
    };
  },
  methods: {
    addItem() {
      this.items.push(`Item ${this.items.length + 1}`);
    },
    removeItem() {
      this.items.pop();
    }
  }
};
</script>

<style>
.list-enter-active, .list-leave-active {
  transition: all 0.5s ease;
}
.list-enter, .list-leave-to {
  opacity: 0;
  transform: translateY(30px);
}
.list-item {
  list-style-type: none;
  padding: 10px;
  background-color: #42b983;
  color: white;
  margin: 5px 0;
  border-radius: 5px;
}
</style>

<template>
  <div>
    <button @click="shuffle">Shuffle items</button>
    <transition-group name="list" tag="ul">
      <li v-for="item in items" :key="item" class="list-item">{{ item }}</li>
    </transition-group>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: ['Item 1', 'Item 2', 'Item 3', 'Item 4']
    };
  },
  methods: {
    shuffle() {
      this.items = this.items.sort(() => Math.random() - 0.5);
    }
  }
};
</script>

<style>
.list-move {
  transition: all 0.5s ease;
  opacity: 0.5;
}
</style>