一文搞懂Vue里的过渡和动画

<template>
  <transition name="fade">
    <p v-if="show">This is a fading element.</p>
  </transition>
  <button @click="toggleShow">Toggle Show</button>
</template>
<style>
    .fade-enter-active,
    .fade-leave-active {
      transition: opacity 0.5s;
    }
    .fade-enter,
    .fade-leave-to {
      opacity: 0;
    }
</style>
<script>
export default {
  data() {
    return {
      show: false
    };
  },
  methods: {
    toggleShow() {
      this.show = !this.show;
    }
  }
};
</script>

<template>
  <transition :name="transitionName">
    <p v-if="show">This is a dynamic transition element.</p>
  </transition>
  <button @click="toggleShow">Toggle Show</button>
</template>
<script>
export default {
  data() {
    return {
      show: false,
      transitionName: 'fade'
    };
  },
  methods: {
    toggleShow() {
      this.show = !this.show;
      this.transitionName = this.show ? 'slide' : 'fade';
    }
  }
};
</script>

<template>
  <transition
    @before-enter="beforeEnter"
    @enter="enter"
    @after-enter="afterEnter"
    @before-leave="beforeLeave"
    @leave="leave"
    @after-leave="afterLeave"
  >
    <p v-if="show">This is a custom transition element.</p>
  </transition>
  <button @click="toggleShow">Toggle Show</button>
</template>
<script>
    export default {
        data() {
            return {
              show: false
            };
          },
        methods() {
            beforeEnter(el) {
              console.log('Before Enter');
              el.style.opacity = 0;
            },
            enter(el, done) {
              console.log('Enter');
              setTimeout(() => {
                el.style.opacity = 1;
                done();
              }, 1000);
            },
            afterEnter(el) {
                console.log('After Enter');
            },
            beforeLeave(el) {
              console.log('Before Leave');
              el.style.opacity = 1;
            },
            leave(el, done) {
              console.log('Leave');
              setTimeout(() => {
                el.style.opacity = 0;
                done();
              }, 1000);
            },
            afterLeave(el) {
              console.log('After Leave');
            },
            toggleShow() {
              this.show = !this.show;
            }
        }
    }
</script>

<template>
  <transition-group name="list" tag="ul">
    <li v-for="item in items" :key="item.id">{{ item.text }}</li>
  </transition-group>
  <button @click="addItem">Add Item</button>
</template>
<style>
.list-enter-active,
.list-leave-active {
  transition: all 0.5s;
}
.list-enter,
.list-leave-to {
  opacity: 0;
  transform: translateY(20px);
}
</style>
<script>
export default {
  data() {
    return {
      items: [
        { id: 1, text: 'Item 1' },
        { id: 2, text: 'Item 2' },
        { id: 3, text: 'Item 3' }
      ]
    };
  },
  methods: {
    addItem() {
      const newItem = {
        id: Date.now(),
        text: 'New Item'
      };
      this.items.push(newItem);
    }
  }
};
</script>

<template>
  <transition :name="transitionName">
    <p v-if="show">This is a dynamic transition element.</p>
  </transition>
  <button @click="toggleShow">Toggle Show</button>
</template>
<script>
export default {
  data() {
    return {
      show: false,
      transitionName: ''
    };
  },
  methods: {
    toggleShow() {
      this.show = !this.show;
      this.transitionName = this.show ? 'fade' : 'slide';
    }
  }
};
</script>

<template>
  <transition
    name="custom-transition"
    @before-enter="beforeEnter"
    @enter="enter"
    @after-enter="afterEnter"
    @before-leave="beforeLeave"
    @leave="leave"
    @after-leave="afterLeave"
  >
    <p v-if="show">This is a custom transition element.</p>
  </transition>
  <button @click="toggleShow">Toggle Show</button>
</template>
<style>
.custom-transition-enter-active,
.custom-transition-leave-active {
  transition: opacity 0.5s, transform 0.5s;
}
.custom-transition-enter,
.custom-transition-leave-to {
  opacity: 0;
  transform: translateY(20px);
}
</style>
<script>
    export default {
      data() {
        return {
              show: false
          };
      },
      methods: {
         beforeEnter(el) {
              el.style.opacity = 0;
              el.style.transform = 'translateY(20px)';
            },
         enter(el, done) {
              setTimeout(() => {
                el.style.opacity = 1;
                el.style.transform = 'translateY(0)';
                done();
              }, 1000);
            },
         afterEnter(el) {
              // 执行进入后的操作
            },
         beforeLeave(el) {
              // 执行离开前的操作
            },
         leave(el, done) {
          setTimeout(() => {
            el.style.opacity = 0;
            el.style.transform = 'translateY(20px)';
            done();
          }, 1000);
         },
         afterLeave(el) {
          // 执行离开后的操作
         },
         toggleShow() {
          this.show = !this.show;
        }
      }
};
</script>