<template> <div id="app"> <div class="select">  <div class="input_text"><input type="text" name="" v-on:focus="options1Show" v-model="result"></div>  <div class="options1" v-show="options1isShow">  <ul>   <li v-on:click="toClick(option.value)" v-for="option in options">{{option.label}}</li>  </ul>  </div>  <div class="options2" v-show="options2isShow">  <ul >   <li v-for="item in secondOptions" v-on:click="selectResult(item.label,item.value)">{{item.label}}</li>  </ul>  </div> </div> </div></template><script>export default { name: 'app', data(){ return {  options:[  {   value:'zhinan',   label:'指南',   children:[   {    value: 'yizhi',    label: '一致'   }, {    value: 'fankui',    label: '反饋'   }, {    value: 'xiaolv',    label: '效率'   }, {    value: 'kekong',    label: '可控'   }   ]  },  {   value: 'daohang',   label: '導航',   children: [{   value: 'cexiangdaohang',   label: '側向導航'   },    {   value: 'dingbudaohang',   label: '頂部導航'   }]  }  ],  secondOptions:[],  options1isShow:false,  options2isShow:false,  result:'' } }, methods:{ options1Show:function(){  this.options1isShow=true; }, toClick:function(item){  this.secondOptions=[];  for(var i=0;i<this.options.length;i++){  if(this.options[i].value==item){   console.log(this.options[i].children);   this.secondOptions=this.options[i].children;   console.log(this.secondOptions);  }  }  this.options2isShow=true; }, selectResult:function(label){  this.result=label;  this.options1isShow=false;  this.options2isShow=false; } }}</script><style>li,ul{ list-style: none; padding:0; margin:0;}li{ height:40px; line-height: 40px; border-bottom: 1px solid #ededed; box-sizing: border-box; text-align: center; cursor: pointer;}.select{ position: relative;}.input_text>input{ width:170px; height:30px; border:1px solid #ddd;}.options1,.options2{ width:170px; height:200px; border:1px solid #ddd; position: absolute; background: #fff; overflow-y: auto;}.options2{ left:170px;}</style>