html代码:
<div id="app">
<ul>
<li v-for="(item,i) in list">{{item.name}}
<button v-show="i < list.length-1" @click="down(i)">↓</button>
<button v-show="i > 0" @click="up(i)">↑</button>
</li>
</ul>
</div>
script代码:
$set(检测数组的变动)
<script>
new Vue({
el:'#app',
data(){
return{
list:[
{id:1,name:'张山'},
{id:2,name:'王霞'},
{id:3,name:'王嘉'},
{id:4,name:'李铭'}
]
}
},
methods:{
down(i){
let temp = this.list[i];
this.$set(this.list, i, this.list[i+1])
this.$set(this.list, i+1, temp)
},
up(i){
let temp = this.list[i];
this.$set(this.list, i, this.list[i-1]),
this.$set(this.list, i-1, temp)
}
}
})
</script>
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