Vue implements a simple shopping cart example

<template>
  <div>
    <div>
      <span>Mobile: </span>
      <span>Price</span> <input type="number" v-model.number="phonePrice">
      <span> Quantity</span><input type="number" v-model.number="phoneCount">
      <span>Subtotal: </span><span>{{phoneTotal}} yuan</span>
    </div>
    <div>
      <span>Computer: </span>
      <span>Price</span> <input type="number" v-model.number="computerPrice">
      <span> Quantity</span><input type="number" v-model.number="computerCount">
      <span>Subtotal: </span><span>{{computerTotal}} yuan</span>
    </div>
    <div>
      <span>Shipping fee: </span><input type="number" v-model.number="freight"><span>Yuan</span><br>
      <span>Total: {{total}} yuan</span>
      <p>Discount: {{discounts}} yuan</p>
      <p>Payable: {{allPrice}}</p>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      phonePrice: '', // price of a phone phoneCount: '', // number of phones computerPrice: '', // price of a computer computerCount: '', // number of computers frequency: '', // freight discounts: ''
    }
  },
  computed: {
    phoneTotal() {
      return this.phonePrice * this.phoneCount
    },
    computerTotal() {
      return this.computerPrice * this.computerCount
    },
    //Total price total () {
      return this.computerTotal + this.phoneTotal + this.freight
    },
    allPrice() {
      return this.total - this.discounts
    }
  },
  watch:
    total:
      depp: true,
      handler () {
        if (this.phoneTotal + this.computerTotal > 5000 && this.phoneTotal + this.computerTotal < 8000) {
          this.discounts = 100
        } else if (this.phoneTotal + this.computerTotal > 8000) {
          this.discounts = 200
        }
      }
    }
  }
}
</script>

<style scoped lang='less'>
</style>