Vue2.0 v-for filter列表过滤功能的实现

var app5 = new Vue({
 el: '#app5',
 data: {
 shoppingList: [
 "Milk", "Donuts", "Cookies", "Chocolate", "Peanut Butter", "Pepto Bismol", "Pepto Bismol (Chocolate flavor)", "Pepto Bismol (Cookie flavor)"
 ],
 key: ""
 },
 computed: {
 filterShoppingList: function () {
 // `this` points to the vm instance
 var key = this.key;
 var shoppingList = this.shoppingList;
 return shoppingList.filter(function (item) {
 return item.toLowerCase().indexOf(key.toLowerCase()) != -1
 });;
 }
 }
})

<div id="app5">
 <h2>Vue-for</h2>
 <ul>
 <li v-for="item in shoppingList">
 {{ item }}
 </li>
 </ul>
 <h2>Vue-for filter实现</h2>
 <ul>
 Filter Key<input type="text" v-model="key"> 
 <li v-for="item in filterShoppingList">
 {{ item }}
 </li>
 </ul> 
 </div>