效果与直接使用el-select一样，多处用el-select显得代码冗余就进行了封装

效果图：

el-select封装：

<template>
  <div class="my-select">
    <el-select
      v-model="person.modelValue"
      :placeholder="placeholder"
      @change="changeSelect"
    >
      <el-option
        v-for="item in options"
        :key="item[val]"
        :label="item[name]"
        :value="item[val]"
      >
      </el-option>
    </el-select>
  </div>
</template>

<script setup>
import { reactive,  watch } from "vue";
const emits = defineEmits(["onChange"]);
let props = defineProps({
  val: {
    type: String,
    default: "value",
  },
  name: {
    type: String,
    default: "label",
  },
  placeholder: {
    type: String,
    default: "请选择",
  },

  options: {
    type: Array,
    default: [],
  },
  value: {
    type: [Number, String],
    default: "",
  },
});
console.log(props);
const person = reactive({
  modelValue: "",
});
function changeSelect(val) {
  emits("onChange", val);
}
watch(
  () => props.value,
  (val) => {
    // 用于回显
    person.modelValue = val;
  },
  { deep: true, immediate: true }
);

</script>
<style scoped lang='less'>
</style>

功能组件内使用el-select封装组件：

<template>
  <div>
    <el-form ref="form" label-width="120px" label-position="left">
      <el-form-item label="选择第几个选项">
        <MySelect
          width="220px"
          title="确定"
          @onChange="addDeciceType"
          :options="person.optionsList"
          :val="'val'"
          :name="'name'"
          placeholder="请选择"
          :value="1"
        >
        </MySelect>
      </el-form-item>
    </el-form>
  </div>
</template>

<script setup>
import { reactive, onMounted } from "vue";
import MySelect from "../components/MySelect.vue";
const person = reactive({
  optionsList: [
    { name: "第1个选项", val: 1 },
    { name: "第2个选项", val: 2 },
    { name: "第3个选项", val: 3 },
  ],
});
function addDeciceType(val) {
  console.log(val);
}
onMounted(() => {});
</script>
<style scoped lang='less'>
</style>