学习vue2.0,使用仿饿了么项目练习,其中购物车小球动画没有效果,看了一些其他人得代码,还是没有找到原因.
下面贴出我的代码,和别人代码得链接

<template>
  <div class="shopcart">
    <div class="content">
      <div class="content-left">
        <div class="logo-wrapper">
          <div class="logo" :class="{'highlight' : totalCount>0}">
            <i class="icon-shopping_cart" :class="{'highlight' : totalCount>0}"></i>
          </div>
          <div class="num" v-show="totalCount>0">{{totalCount}}</div>
        </div>
        <div class="price" :class="{'highlight' : totalCount>0}">¥{{totalPrice}}元</div>
        <div class="desc">另需配送费 ¥{{deliveryPrice}}元</div>
      </div>
      <div class=" content-right">
        <div class="pay" :class="payClass">
          {{payDesc}}
        </div>
      </div>
    </div>
    <div class="ball-container">
      <transition-group name="drop" v-on:before-enter="beforeEnter" v-on:enter="whenenter" v-on:after-enter="afterEnter" v-on:before-leave="beforeLeave"
                        v-on:leave="leave" v-on:after-leave="afterLeave">
      <div class="ball" v-for="(ball, index) in balls" v-show="ball.show" :key="index">
        <div class="inner inner-hook"></div>
      </div>
      </transition-group>

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

<script type="text/ecmascript-6">
  import { bus } from '../../util/bus.js'

  export default {
    props: {
      selectFoods: {
        type: Array,
        default () {
          return [
            {
              price: 0,
              count: 0
            }
          ]
        }
      },
      deliveryPrice: {
        type: Number,
        default: 0
      },
      minPrice: {
        type: Number,
        default: 0
      }
    },
    data () {
      return {
        balls: [
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          }
        ],
        droppedBalls: []
      }
    },
    created () {
      console.log('created')
      bus.$on('addcart', this.dropBall)
    },
    methods: {
      beforeEnter: function (el) {
        console.log('before enter...\n')
        let count = this.balls.length
        while (count--) {
          let ball = this.balls[count]
          if (ball.show) {
            let rect = ball.el.getBoundingClientRect()
            let x = rect.left - 32
            let y = -(window.innerHeight - rect.top - 22)
            el.style.display = ''
            el.style.webkitTransform = `translate3d(0,${y}px,0)`
            el.style.transform = `translate3d(0,${y}px,0)`
            let inner = el.getElementsByClassName('inner-hook')[0]
            inner.style.webkitTransform = `translate3d(${x}px,0,0)`
            inner.style.transform = `translate3d(${x}px,0,0)`
          }
        }
      },
      whenenter: function (el, done) {
        /* eslint-disable no-unused-vars */
        console.log('when enter animate---\n')
        let rf = el.offsetHeight
        this.$nextTick(() => {
          el.style.display = ''
          el.style.webkitTransform = 'translate3d(0,0,0)'
          el.style.transform = 'translate3d(0,0,0)'
          let inner = el.getElementsByClassName('inner-hook')[0]
          inner.style.webkitTransform = 'translate3d(0,0,0)'
          inner.style.transform = 'translate3d(0,0,0)'
          done()
        })
      },
      afterEnter: function (el) {
        console.log('after enter animate...\n')
        let ball = this.droppedBalls.shift()
        if (ball) {
          ball.show = false
          el.style.display = 'none'
        }
      },
      beforeLeave: function (el) {
        // ...
        console.log('before leave animate...\n')
      },
      leave: function (el, done) {
        // ...
        console.log('leave animate...\n')
        done()
      },
      afterLeave: function (el) {
        // ...
        console.log('after leave animate...\n')
      },
      dropBall (el) {
        console.log('dropBall method,el: ' + el)
        for (let i = 0; i < this.balls.length; i++) {
          let ball = this.balls[i]
          if (!ball.show) {
            ball.show = true
            ball.el = el
            this.droppedBalls.push(ball)
            return
          }
        }
      }
    },
    computed: {
      totalPrice () {
        let total = 0
        this.selectFoods.forEach((food) => {
          total += food.price * food.count
        })
        return total
      },
      totalCount () {
        let count = 0
        this.selectFoods.forEach((food) => {
          count += food.count
        })
        return count
      },
      payDesc () {
        if (this.totalPrice === 0) {
          return `¥${this.minPrice}元起送`
        } else if (this.totalPrice < this.minPrice) {
          let diff = this.minPrice - this.totalPrice
          return `还差¥${diff}元起送`
        } else {
          return '去结算'
        }
      },
      payClass () {
        if (this.totalPrice < this.minPrice) {
          return 'not-enough'
        } else {
          return 'enough'
        }
      }
    }
  }
</script>

<style lang="stylus" rel="stylesheet/stylus">
  .shopcart
    position: fixed
    left: 0
    bottom: 0
    z-index: 50
    width: 100%
    height: 48px
    background: #f00
    .content
      display: flex
      background: #141d27
      font-size: 0
      height: 100%
      color: rgba(255, 255, 255, 0.4)
      .content-left
        flex: 1
        .logo-wrapper
          display: inline-block
          position: relative
          top: -10px
          margin: 0 12px
          padding: 6px
          width: 56px
          height: 56px
          box-sizing: border-box
          vertical-align: top
          border-radius: 50%
          background: #141d27
          .logo
            width: 100%
            height: 100%
            border-radius: 50%
            background: rgb(43, 52, 60)
            text-align: center
            &.highlight
              background: rgb(0, 160, 220)
            .icon-shopping_cart
              line-height: 44px
              font-size: 24px
              color: #80858a
              &.highlight
                color: #fff
          .num
            position: absolute
            top: 0
            right: 0
            width: 24px
            height: 16px
            line-height: 16px
            text-align: center
            border-radius: 16px
            font-size: 9px
            font-weight: 700
            color: #fff
            background: rgb(240, 20, 20)
            box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.4)
        .price
          display: inline-block
          vertical-align: top
          margin-top: 12px
          padding-right: 12px
          line-height: 24px
          box-sizing: border-box
          border-right: 1px solid rgba(255, 255, 255, 0.2)
          font-size: 16px
          font-weight: 700
          &.highlight
            color: #fff
        .desc
          display: inline-block
          vertical-align: top
          margin-top: 12px
          padding-left: 12px
          line-height: 24px
          font-size: 10px
      .content-right
        flex: 0 0 105px
        width: 105px
        .pay
          height: 48px
          line-height: 48px
          text-align: center
          font-size: 12px
          font-weight: 700
          &.not-enough
            background: #2b333b
          &.enough
            background: #00b43c
            color: #fff
    .ball-container
      transition: all 1
      .ball
        position: fixed
        left: 32px
        bottom: 22px
        z-index: 200
        width: 18px
        height: 18px
        border-radius: 50%
        transition: all  1s
        &.drop-enter-to, &.drop-leave-to
          transition all 0.4s
          .inner
            width: 16px
            height: 16px
            border-radius: 50%
            background: rgb(0,160,220)
            transition: all 1s linear

</style>

调试过三个钩子函数,

beforeEnter: function (el) {
  },
enter: function (el, done) {
    done()
},
afterEnter: function (el) {
},

钩子函数中dom节点获取没有问题,小球得style也正确设置了, 但是过渡动画没有效果,尝试很久实在不知道原因出现在哪,希望高手帮帮忙.

下面参考别人github上完整项目代码的链接:
https://github.com/moxiaojing...