Vue.js 中制作自定义选择组件的代码附演示demo

<template>
 <div
 class="custom-select"
  :tabindex="tabindex"
  @blur="open = false"
 >
  <div
  class="selected"
  :class="{open: open}"
  @click="open = !open"
 >
  {{ selected }}
 </div>
 <div
  class="items"
  :class="{selectHide: !open}"
 >
  <div
  class="item"
  v-for="(option, i) of options"
  :key="i"
  @click="selected=option; open=false; $emit('input', option)"
  >
  {{ option }}
  </div>
 </div>
 </div>
</template>

 <script>
 export default {
 props:{
  options:{
  type: Array,
  required: true
  },
  tabindex:{
  type: Number,
  required: false,
  default: 0
 }
 },
 data() {
 return {
  selected: this.options.length > 0 ? this.options[0] : null,
  open: false
 };
 },
 mounted(){
 this.$emit('input', this.selected);
 }
};
</script>

<style scoped>
 .custom-select {
 position: relative;
 width: 100%;
 text-align: left;
 outline: none;
 height: 47px;
 line-height: 47px;
}

.selected {
 background-color: #080D0E;
 border-radius: 6px;
 border: 1px solid #858586;
 color: #ffffff;
 padding-left: 8px;
 cursor: pointer;
 user-select: none;
}

.selected.open{
 border: 1px solid #CE9B2C;
 border-radius: 6px 6px 0px 0px;
}

.selected:after {
 position: absolute;
 content: "";
 : 22px;
 right: 10px;
 width: 0;
 height: 0;
 border: 4px solid transparent;
 border-color: #fff transparent transparent transparent;
}

.items {
 color: #ffffff;
 border-radius: 0px 0px 6px 6px;
 overflow: hidden;
 border-right: 1px solid #CE9B2C;
 border-left: 1px solid #CE9B2C;
 border-bottom: 1px solid #CE9B2C;
 position: absolute;
 background-color: #080D0E;
 left: 0;
 right: 0;
}

.item{
 color: #ffffff;
 padding-left: 8px;
 cursor: pointer;
 user-select: none;
}

.item:hover{
 background-color: #B68A28;
}

.selectHide {
 display: none;
}
</style>