el-date-picker的value-forma在Element UI (Vue 2)和Element Plus (Vue 3)中的不同

Element UI (Vue 2):

<template>
  <el-form-item prop="register_date" label="成立日期">
    <el-date-picker
      v-model="temp.register_date"
      type="date"
      value-format="yyyy-MM-dd"
      default-value="2020-01-01"
      placeholder="选择日期"
    />
  </el-form-item>
</template>

<script>
export default {
  data() {
    return {
      temp: {
        register_date: ''
      }
    };
  }
};
</script>

Element Plus (Vue 3):

<template>
  <el-form-item prop="register_date" label="成立日期">
    <el-date-picker
      v-model="temp.register_date"
      type="date"
      value-format="YYYY-MM-DD"
      :default-value="defaultDate"
      placeholder="选择日期"
    />
  </el-form-item>
</template>

<script>
import { defineComponent } from 'vue';
import { ElFormItem, ElDatePicker } from 'element-plus';

export default defineComponent({
  components: {
    ElFormItem,
    ElDatePicker,
  },
  data() {
    return {
      temp: {
        register_date: ''
      },
      defaultDate: new Date().toISOString().split('T')[0]
    };
  }
});
</script>