这个组件是对el-select组件的增强，为el-select组件增加了属性dict。

当el-option不包含el-select的value时，会根据dict显示label。

This component is an enhancement to the el-select component, adding the attribute dict to the el-select component.

When el-option does not contain the value of el-select, label will be displayed according to dict.

<script setup>
import { ref } from 'vue'

const val = ref('')

const dict1 = [
  {label:'option 1',value:1}
]
const dict2 = [
  {label:'option 1',value:1},
  {label:'option 2',value:2},
]
</script>

<template>
  <ElSelect4 v-model="val" :dict="dict2">
    <ElOption
      v-for="item in dict1"
      :key="item.value"
      :label="item.label"
      :value="item.value"
    />
  </ElSelect4>
  <el-button @click="val=2">2</el-button>
</template>