Satu contoh menerangkan cara Vue melaksanakan fungsi menambah troli beli-belah dan membaling objek

npm install vue-beautiful-dnd --save

import Vue from 'vue'
import { DragDrop } from 'vue-beautiful-dnd'

Vue.use(DragDrop)

<template>
  <div>
    <h2>您的购物车</h2>
    <div class="cart-items">
      <div v-for="(item, index) in cartItems" :key="index" class="cart-item">
        <img :src="item.image" :alt="item.title">
        <div class="item-details">
          <h4>{{ item.title }}</h4>
          <span>{{ item.price }}</span>
        </div>
        <button @click="handleAddToCart(item)">添加到购物车</button>
      </div>
    </div>

    <div class="cart-dropdown" v-if="showCart">
      <div class="droppable" ref="cart">
        <div class="cart-item" v-for="(item, index) in cart" :key="item.id">
          <img :src="item.image" :alt="item.title">
          <div class="item-details">
            <h4>{{ item.title }}</h4>
            <span>{{ item.price }}</span>
          </div>
          <button @click="handleRemoveFromCart(item)">删除</button>
        </div>
      </div>
      <div class="cart-total">
        <span>总计: {{ total }}</span>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cartItems: [
        {
          id: 1,
          title: '商品1',
          price: 12.99,
          image: 'path/to/image'
        },
        {
          id: 2,
          title: '商品2',
          price: 24.99,
          image: 'path/to/image'
        },
        {
          id: 3,
          title: '商品3',
          price: 8.99,
          image: 'path/to/image'
        }
      ],
      cart: [],
      showCart: false
    }
  },
  computed: {
    total() {
      return this.cart.reduce((total, item) => total + item.price, 0)
    }
  },
  methods: {
    handleAddToCart(item) {
      this.cart.push(item)
      this.showCart = true
    },
    handleRemoveFromCart(item) {
      const index = this.cart.findIndex(cartItem => cartItem.id === item.id)
      this.cart.splice(index, 1)
    }
  }
}
</script>

<template>
  <div>
    <!-- div.cart-items 代码序列不变 -->
    <div class="cart-dropdown" v-if="showCart">
      <div class="droppable" ref="cart">
        <div
          ref="droppable"
          class="cart-item"
          v-for="(item, index) in cart"
          :key="item.id"
        >
          <img :src="item.image" :alt="item.title">
          <div class="item-details">
            <h4>{{ item.title }}</h4>
            <span>{{ item.price }}</span>
          </div>
          <button @click="handleRemoveFromCart(item)">删除</button>
        </div>
      </div>
      <div class="cart-total">
        <span>总计: {{ total }}</span>
      </div>
    </div>
  </div>
</template>

<script>
import { Drag, Drop } from 'vue-beautiful-dnd'
export default {
  // data、computed、methods 部分省略
  components: {
    Drag,
    Drop
  },
  methods: {
    handleAddToCart(item, event) {
      const cartEle = this.$refs.cart
      this.cart.push(item)

      const droppableEle = this.$refs.droppable
      const draggableEle = event.target.closest('.cart-item')

      const start = {
        x: draggableEle.offsetLeft,
        y: draggableEle.offsetTop
      }
      const end = {
        x: cartEle.offsetLeft + droppableEle.offsetLeft + droppableEle.offsetWidth / 2,
        y: cartEle.offsetTop + droppableEle.offsetTop + droppableEle.offsetHeight / 2
      }

      const distance = Math.sqrt(
        Math.pow(end.x - start.x, 2) + Math.pow(end.y - start.y, 2)
      )
      const time = 500
      const speed = distance / time
      const path = anime.path(
        `M${start.x} ${start.y} Q ${(start.x + end.x) / 2} ${(start.y + end.y) / 2} ${end.x} ${end.y}`
      )
      anime({
        targets: draggableEle,
        translateX: path('x') - start.x,
        translateY: path('y') - start.y,
        duration: time,
        easing: 'easeOutQuad',
        complete: () => {
          anime({
            targets: draggableEle,
            translateY: 0,
            translateX: 0,
            duration: 200
          })

          this.showCart = true
        }
      })
    }
  }
}
</script>