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>
console
var app = new Vue({
  el: '#app',
  data: {
    package1: [
      {
      	name: 'iPhone 7',
      	price: 8199,
      	count: 2  
      },
      {
      	name: 'iPad',
      	price: 2888,
      	count: 3
      }
    ],
    package2: [
      {
      	name: 'apple',
      	price: 3,
      	count: 3  
      },
      {
      	name: 'banana',
      	price: 2,
      	count: 3
      }
    ]
  },
  computed: {
    prices: function() {
      var prices = 0;
      for(var i=0;i<this.package1.length;i++) {
        prices += this.package1[i].price*this.package1[i].count;
      }
      for(var i=0;i<this.package2.length;i++) {
         prices += this.package2[i].price*this.package2[i].count;
      }
        return prices;
    }
  }
})
<script src='https://unpkg.com/vue/dist/vue.min.js'></script>
<div id="app">
  总价:{{ prices }}
</div>