<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>