<div id="example">
 <div>
 <button @click='push'>push</button>
 <button @click='pop'>pop</button>
 <button @click='shift'>shift</button>
 <button @click='unshift'>unshift</button>
 <button @click='splice'>splice</button>
 <button @click='sort'>sort</button>
 <button @click='reverse'>reverse</button>
 </div>
 <ul>
 <li v-for="item in items" >
  {{ item.message }}
 </li>
 </ul> 
</div>

<script>
var example = new Vue({
 el: '#example',
 data: {
 items: [
  {message: 'Foo' },
  {message: 'Bar' },
  {message: 'Baz' }
 ],
 addValue:{message:'match'}
 },
 methods:{
 push(){
  this.items.push(this.addValue)
 },
 pop(){
  this.items.pop()
 },
 shift(){
  this.items.shift()
 },
 unshift(){
  this.items.unshift(this.addValue)
 },
 splice(){
  this.items.splice(0,1)
 },
 sort(){
  this.items.sort()
 },
 reverse(){
  this.items.reverse()
 },
 }
})
</script>

<div id="example">
 <div>
 <button @click='concat'>concat</button>
 <button @click='slice'>slice</button>
 <button @click='map'>map</button>
 <button @click='filter'>filter</button>
 </div>
 <ul>
 <li v-for="item in items" >
  {{ item }}
 </li>
 </ul> 
</div>

<script>
var example = new Vue({
 el: '#example',
 data: {
 items: ['Foo','Bar','Baz'],
 addValue:'match'
 },
 methods:{
 concat(){
  this.items = this.items.concat(this.addValue)
 },
 slice(){
  this.items = this.items.slice(1)
 },
 map(){
  this.items = this.items.map(function(item,index,arr){
  return index + item; 
  })
 },
 filter(){
  this.items = this.items.filter(function(item,index,arr){
  return (index > 0); 
  })
 }
 }
})
</script>

<div id="example">
 <div>
 <button @click='setVal'>setVal</button>
 <button @click='setLength'>setLength</button>
 <button @click='pop'>pop</button>
 </div>
 <ul>
 <li v-for="item in items" >{{ item }}</li>
 </ul> 
 <p>{{ message }}</p> 
</div>

<script>
var watchFunc = function(){
 example.message = '数据发生变化';
 setTimeout(function(){
 example.message = '';
 },500); 
}
var example = new Vue({
 el: '#example',
 data: {
 items: ['Foo','Bar','Baz'],
 message:'',
 },
 watch:{
 items:watchFunc
 },
 methods:{
 pop(){
  this.items.pop()
 },
 setVal(){
  this.items[0]= 'match';
 },
 setLength(){
  this.items.length = 2;
 }
 }
})
</script>

// Vue.set
Vue.set(example1.items, indexOfItem, newValue)
// Array.prototype.splice
example1.items.splice(indexOfItem, 1, newValue)

example1.items.splice(newLength)

<div id="example">
 <div>
 <button @click='setVal1'>setVal1</button>
 <button @click='setVal2'>setVal2</button>
 <button @click='setLength'>setLength</button>
 </div>
 <ul>
 <li v-for="item in items" >{{ item }}</li>
 </ul> 
 <p>{{ message }}</p> 
</div>

<script>
var watchFunc = function(){
 example.message = '数据发生变化';
 setTimeout(function(){
 example.message = '';
 },500); 
}
var example = new Vue({
 el: '#example',
 data: {
 items: ['Foo','Bar','Baz'],
 message:'',
 },
 watch:{
 items:watchFunc
 },
 methods:{
 setVal1(){
  Vue.set(this.items, 0, 'match')
 },
 setVal2(){
  this.items.splice(1, 1, 'xiaohuochai')
 }, 
 setLength(){
  this.items.splice(2)
 }
 }
})
</script>

<div id="example">
 <ul>
 <li v-for="n in evenNumbers">{{ n }}</li>
 </ul> 
</div>

<script>
var example = new Vue({
 el: '#example',
 data: {
 numbers: [ 1, 2, 3, 4, 5 ],
 },
 computed: {
 evenNumbers: function () {
  return this.numbers.filter(function (number) {
  return number % 2 === 0
  })
 }
 }
})
</script>

<div id="example">
 <ul>
 <li v-for="n in even(numbers)">{{ n }}</li>
 </ul> 
</div>

<script>
var example = new Vue({
 el: '#example',
 data: {
 numbers: [ 1, 2, 3, 4, 5 ],
 },
 methods: {
 even: function (numbers) {
  return numbers.filter(function (number) {
  return number % 2 === 0
  })
 }
 }
})
</script>