vue下拉选择框，自定义样式，

这是vue组件

<template>
  <div class="a">
    <span @click="handleDrop">{{active>-1?list[active].label:"请选择"}}</span>
    <div class="z">
      <ul v-show="visible" >
        <li v-for="(item,index) in list" :class="index===active?'active':''" @click="choose(item,index)" :key="index">
          {{item.label}}
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
export default {
  name: "mySelect",
  props:['list'],
  data() {
    return {
      visible: false,
      active:-1
    }
  },
  methods: {
    choose(item,index){
      this.visible=false;
      if(this.active!==index){
        this.active=index;

        this.$emit("selected",{
          index:index,
          label:item.label,
          value:item.value
        })
      }

    },
    handleDrop(){
      this.visible=!this.visible
    },
    outClick(e){
      let dropRef= this.$el
      if(!dropRef.contains(e.target)&&this.visible){
        this.visible=false
      }
    }
  },

  mounted(){
    document.addEventListener('click',this.outClick)
  },
  destroyed(){
    document.removeEventListener('click',this.outClick)
  }

}
</script>

<style scoped>
.a{
  position: relative;
  width: 200px;
  display: inline-block;
  text-align: center;
  user-select: none;

color: #125165;
}
.a>span{
  padding: 10px 20px;
  background-color: lightblue;
  display: block;
  box-shadow: inset 0 0 0 2px #125165;

  color:  #125165;
}
.z>ul{
  list-style: none;
  margin: 0;
   position: absolute;
  top:10px;
  padding-inline-start: 0;

  background-color: lightblue;
  left: 0;
  /*left 不包含border*/
  width: 100%;
  box-shadow: inset 0 0 0 2px #125165;

}

.z>ul>li{
  padding: 10px 0;
}
.z{
  position: relative;
}
.z>ul>li:hover,div>ul>li.active{
  background-color: #125165;
  color: lightblue;
}
</style>

这个是使用方法：

在引用页使用：

  <my-select2 @selected="useItem2" :list="fruits2"/>

数据格式：

      fruits2:[
        {
          label:'苹果',
          value:'apple',
          key:'12'
        },
        {
          label:'梨子',
          value:'pear',
          key:'13'
        },
        {
          label:'香蕉',
          value:'banana',
          key:'14'
        },
        {
          label:'橘子',
          value:'orange',
          key:'15'
        },
        {
          label:'柠檬',
          value:'lemon',
          key:'16'
        },
      ],

接受方法：

useItem2:function (o){
      console.log(o)
    },