日期: 2020-06-22 17:53:32
<body> <div id="app"> <ul> <li v-for="(item,i) in list">{{item.name}} //i<list.length-1 需要的是0,1,2,3 需要四个向上的箭头 长度为5 减1之后长度为4 小于4就是0,1,2,3 <button v-show="i<list.length-1" @click="down(i)">↓</button> <button v-show="i>0" @click="up(i)">↑</button> </li> </ul> </div> <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script> <script> Vue.config.productionTip = false//不去提示 new Vue({ el: "#app", data() { return { list:[ {id:111,name:"aaa"}, {id:222,name:"bbb"}, {id:333,name:"ccc"}, {id:444,name:"ddd"} ] } }, 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> </body>
$set(检测数组的变动)
附录:vue点击实现箭头的向上与向下
html代码
<span class="iconfont icon-jiantouarrow486" v-if="show" @click="ptOpenDowOrUp()"></span> <span class="iconfont icon-jiantouarrow492" v-else></span>
vue .js部分
var vm = new Vue({ el:'#app', data:{ show:true, }, methods:{ ptOpenDowOrUp:function () { vm.show = !vm.show }, } })
总结
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