一、proxy方式

1.封装日期选择工具函数：

在untils文件夹下新建index.ts,并导出工具函数

/**
 * 获取不同类型日期
 * param：类型 dateVal: 是否指定
 */
export function getSystemDate(param: any, dateVal: any) {
  let systemDate = dateVal ? new Date(dateVal) : new Date(),
    year = systemDate.getFullYear(),
    month = systemDate.getMonth() + 1,
    date = systemDate.getDate(),
    hours = systemDate.getHours(),
    minutes = systemDate.getMinutes(),
    seconds = systemDate.getDate(),
    milliseconds = systemDate.getMilliseconds();
  month = month < 10 ? "0" + month : month;
  date = date < 10 ? "0" + date : date;
  hours = hours < 10 ? "0" + hours : hours;
  minutes = minutes < 10 ? "0" + minutes : minutes;
  seconds = seconds < 10 ? "0" + seconds : seconds;
  if (param == 0) {
    return year + "-" + month + "-" + date;
  } else if (param == 1) {
    return year + "-" + month + "-" + date + " " + hours + ":" + minutes + ":" + seconds;
  } else if (param == 2) {
    return year + "-" + month + "-" + date + " " + hours + ":" + minutes + ":" + seconds + "." + milliseconds;
  } else if (param == 3) {
    return year + "-" + month;
  } else if (param == 4) {
    return year;
  }
}

2.引入并挂载到全局

在main.ts中，引入后挂载

import { App, createApp } from "vue";
import App from "./App.vue";

import { getSystemDate } from "@/utils/index"; //引入全局使用的方法

const app = createApp(App);

app.config.globalProperties.$getSystemDate = getSystemDate; //挂载到全局

app.mount("#app");

注意：

        1.vue3中挂载实例要用app.config.globalProperties.$方法，而vue2中挂载实例是Vue.prototype.$方法；

3.在页面中按需调用

template部分代码：

<template>
  <div>
      <el-date-picker
          v-model="plantInfo.gridDate"
          type="date"
          placeholder="选择日期"
          :disabled-date="disabledDate"
          :shortcuts="shortcuts"
          format="YYYY-MM-DD"
          style="width: 100%"
      />
  </div>
</template>

script 中代码：

<script setup lang="ts" name="site">
import { ref, reactive, getCurrentInstance } from "vue";

// proxy相当于 vue2的this，从getCurrentInstance 实例中获取，proxy对象
const { proxy } = getCurrentInstance();

interface PlantInfo {
  plantName: any;
  plantScale: any;
  sysuserid: any;
  userDepid: any;
  gridDate: any;
  plantNetType: any;
  voltageLevel: any;
  prjAddr: any;
  longitude: any;
  moduleManufacturer: any;
  componentBrand: any;
  componentModel: any;
  workHours: any;
  plantStatus: any;
  roofPitch: any;
  orientation: any;
  plantShip: any;
  plantType: any;
  streetAddress: any;
  plantSummary: any;
  plantImageUrl: any;
  plantInvestor: any;
}

const plantInfo = ref<PlantInfo>({
  plantName: "",
  plantScale: "",
  sysuserid: "",
  userDepid: "",
  gridDate: proxy.$getSystemDate(0),
  plantNetType: "",
  voltageLevel: "",
  prjAddr: "",
  longitude: "",
  moduleManufacturer: "",
  componentBrand: "",
  componentModel: "",
  workHours: "",
  plantStatus: "",
  roofPitch: "",
  orientation: "",
  plantShip: "",
  plantType: "",
  streetAddress: "",
  plantSummary: "",
  plantImageUrl: "",
  plantInvestor: ""
});

const disabledDate = (time: Date) => {
  return time.getTime() > Date.now();
};
// 快速日期选择属性
const shortcuts = [
  {
    text: "今天",
    value: new Date()
  },
  {
    text: "昨天",
    value: () => {
      const date = new Date();
      date.setTime(date.getTime() - 3600 * 1000 * 24);
      return date;
    }
  },
  {
    text: "一周前",
    value: () => {
      const date = new Date();
      date.setTime(date.getTime() - 3600 * 1000 * 24 * 7);
      return date;
    }
  }
];
</script>

二、provide方式

        在Vue 3 + TypeScript 中挂载并使用一个全局的工具函数，你可以通过 Vue 实例的 provide 和 inject 方法来实现。具体步骤如下：

1.创建工具函数： 首先，创建你的工具函数。

// utils.ts
export function myUtilityFunction(): void {
  // Your utility function logic here
}

2.在主入口文件中挂载工具函数： 在 Vue 的主入口文件中，将工具函数通过 provide 方法挂载到全局。

// main.ts
import { createApp } from 'vue';
import App from './App.vue';
import { myUtilityFunction } from './utils';

const app = createApp(App);

// 将工具函数挂载到全局
app.provide('myUtility', myUtilityFunction);

app.mount('#app');

3.在组件中使用工具函数： 在需要使用工具函数的组件中，通过 inject 方法注入并使用该函数。

<!-- MyComponent.vue -->
<template>
  <div>
    <button @click="useUtility">使用工具函数</button>
  </div>
</template>

<script lang="ts">
import { defineComponent, inject } from 'vue';

export default defineComponent({
  setup() {
    // 注入工具函数
    const myUtility = inject<() => void>('myUtility');

    const useUtility = () => {
      // 使用工具函数
      myUtility();
    };

    return {
      useUtility
    };
  }
});
</script>