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<div id="app">
  <ul>
    <li v-for="product in products">
      {{ product.name }} / {{ product.price }}
      <button type="button" @click="addToCart(product)">加入購物車</button>
    </li>
  </ul>
  <h6>我的購物車：</h6>
    <ul>
      <li v-for="cart in carts">
        {{ cart.name }}
      </li> 
    </ul>
    <p>總計：{{ conversionPrice(sum) }}</p>
</div>

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Vue.createApp({
  data(){
    return{
      products:[
        {
          name: '蛋餅',
          price: 30,
          vegan: false
        },
        {
          name: '飯糰',
          price: 35,
          vegan: false
        },
        {
          name: '小籠包',
          price: 60,
          vegan: false
        },
        {
          name: '蘿蔔糕',
          price: 30,
          vegan: true
        },
      ],
      carts:[],
      sum: 0
    }
  },
  methods:{
    //商品加入購物車
    addToCart(product){
      this.carts.push(product)
      this.calculatePrice();
    },
    //計算購物車內的總金額
    calculatePrice(){
      let total = 0;
      this.carts.forEach((item)=>{
        total += item.price;
      })
      this.sum = total;
    },
    //轉換金額顯示格式
    conversionPrice(price){
      return `NT$ ${price}`
    }
  }
}).mount("#app");

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<div id="app">
  <ul>
    <li v-for="product in products">
      {{ product.name }} / {{ product.price }}
      <button type="button" @click="addToCart(product)">加入購物車</button>
    </li>
  </ul>
  <h6>我的購物車：</h6>
    <ul>
      <li v-for="cart in carts">
        {{ cart.name }}
      </li> 
    </ul>
    <p>總計：{{ calculateTotal }}</p>
</div>

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Vue.createApp({
  data(){
    return{
      products:[
        {
          name: '蛋餅',
          price: 30,
          vegan: false
        },
        {
          name: '飯糰',
          price: 35,
          vegan: false
        },
        {
          name: '小籠包',
          price: 60,
          vegan: false
        },
        {
          name: '蘿蔔糕',
          price: 30,
          vegan: true
        },
      ],
      carts:[],
      sum: 0
    }
  },
  methods:{
    addToCart(product){
      this.carts.push(product)
    }
  },
  computed:{
    calculateTotal(){
      let total = 0;
      this.carts.forEach((item)=>{
        total += item.price;
      })
      this.sum = total;
      return `NT$ ${total}`
    }
  }
}).mount("#app");