<div id="app" class="container">
 <table class="table table-bordered">
 <div v-for = "book in books">
  <tr>
  <th>書名</th>
  <th>書的價格</th>
  <th>書的數(shù)量</th>
  <th>小計</th>
  <th>操作</th>
  </tr>
  <tr v-for = "(index,book ) in books">
  <td>{{book.name}}</td>
  <td>{{book.price}}</td>
  <td><button @click="book.count&&book.count--">-</button><input type="text" v-model="book.count" /><button @click="book.count++">+</button></td>
  <td>{{book.price*book.count}}</td>
  <td><button class="btn btn-danger" @click="deleteBook(book)">刪除</button></td>
  </tr>
  <tr>
  <td colspan="5">
  總價{{total}}
  </td>
  </tr>
 </div>
 </table>
 <div class="form-group">
 <label for="bookname" id="bookname">書名</label>
 <input type="text" v-model="list.name" class="form-control"/>
 </div>
 <div class="form-group">
 <label for="bookprice" id="bookprice">價格</label>
 <input type="text" v-model="list.price" class="form-control"/>
 </div>
 <div class="form-group">
 <label for="bookcount" id="bookcount">數(shù)量</label>
 <input type="text" v-model="list.count" class="form-control"/>
 </div>
 <div class="form-group">
 <button class="btn btn-primary" @click="add">添加</button>
 </div>
 </div>

<script src="js/vue.js"></script>
 <script>
 var vm = new Vue({
 el:"#app",
 data:{
  books:[
  {name:'VUE js',price:40,count:1},
  {name:'NODE js',price:20,count:1},
  {name:'REACT js',price:30,count:1},
  {name:'ANGULAR js',price:100,count:1},
  {name:'JQUERY js',price:50,count:1},
  ],
  list:{
  name:'',
  price:'',
  count:''
  }
 },
 methods:{
  deleteBook(book){
  // vue 給我們提供了一個 $remove的方法，在數(shù)組中刪除
  this.books.$remove(book);
  /*this.books = this.books.filter((item)=>{
  return item != book
  })*/
  },
  add(){
  this.books.push(this.list);
  this.list = {
  name:'',
  price:'',
  count:''
  }
  }
 },
 computed:{
  total(){
  var sum = 0;
  this.books.forEach(item =>{
  sum += item.price*item.count;
  })
  return sum;
  }
 }
 });
</script>

methods:{
  min(index){
  if(this.books[index].count>0){
  this.books[index].count = parseInt(this.books[index].count) - 1;
  }
  },
  deleteBook(book){
  // vue 給我們提供了一個 $remove的方法，在數(shù)組中刪除
  this.books.$remove(book);
  /*this.books = this.books.filter((item)=>{
  return item != book
  })*/
  },
  add(){
  this.books.push(this.list);
  this.list = {
  name:'',
  price:'',
  count:''
  }
  }
 }

min(book){
 if(book.count>0){
 book.count = parseInt(book.count) - 1;
 }
}