<div slot="title"></div>

<div slot="title" slot-scope="scope"></div>

vue3：上下对应，title是自己随便起的名字

<template #title></template>

<template #title="scope"></template>

 2、el-dialog实现

<el-dialog v-model="addOpen" class="diaStyle" style="height: 80vh; overflow-y: auto" :title="title"><el-form ref="ruleForm" :model="form" :inline="true" :rules="rules" label-width="80px" style="margin-bottom: 20px"><el-row><el-col :span="12"><el-form-item label="日期" prop="date" style="width: 100%;"><el-input v-model="form.date" type="text" placeholder="请输入日期" :disabled="disabled" /></el-form-item></el-col><el-col :span="12"><el-form-item label="姓名" prop="name" style="width: 100%;"><el-input v-model="form.name" type="text" placeholder="请输入姓名" :disabled="disabled" /></el-form-item></el-col></el-row><el-row><el-col :span="12"><el-form-item label="性别" prop="sex" style="width: 100%;"><el-select v-model="form.sex" placeholder="请选择性别" :disabled="disabled"><el-option v-for="item in sexOption" :key="item.value" :label="item.label" :value="item.value"></el-option></el-select></el-form-item></el-col><el-col :span="12"><el-form-item label="年龄" prop="age" style="width: 100%;"><el-input v-model="form.age" type="text" placeholder="请输入年龄" :disabled="disabled" /></el-form-item></el-col></el-row><el-row><el-col :span="12"><el-form-item label="联系方式" prop="phone" style="width: 100%;"><el-input v-model="form.phone" type="text" placeholder="请输入联系方式" :disabled="disabled" /></el-form-item></el-col><el-col :span="12"><el-form-item label="启用状态" prop="enableFlag" style="width: 100%;"><el-radio-group v-model="form.enableFlag" :disabled="disabled"><el-radio v-for="dict in enableOption" :key="dict.value" :label="dict.value">{{dict.label}}</el-radio></el-radio-group></el-form-item></el-col></el-row><el-row><el-col :span="24"><el-form-item label="地址" prop="address" style="width: 100%;"><el-input v-model="form.address" type="text" placeholder="请输入地址" :disabled="disabled" /></el-form-item></el-col></el-row></el-form><div class="dialog-footer"><el-button type="primary" @click="submitForm" v-preventReClick="2000" v-if="confDisabled">保 存</el-button><el-button @click="closeDialog">{{buttonName}}</el-button></div></el-dialog>

2.1、vue3 中无法使用:visible.sync的问题

:visible指的是属性绑定，表示弹框的显示隐藏。当:visible的值为ture的时候，弹框显示，当为false的时候，弹框隐藏。:visible.sync指的就是同步动态双向的来表示visible的值。

在vue3中取而代之的是v-model，将:visible.sync  改为  v-model

2.2、submitForm提交校验form表单

<script setup>
import { toRefs, ref, reactive, unref} from 'vue'
/** 提交按钮 */let submitForm = () => {const ff = unref(ruleForm);if (!ff) return;ruleForm.value.validate((valid) => {if (valid) {if (form.value.id != undefined) {instance.proxy.$message({message: 'id为：' + form.value.id + '的数据修改成功',type: 'success',})addOpen.value = false;reset();} else {instance.proxy.$message({message: '新增成功',type: 'success',})addOpen.value = false;reset();}}});
</script>

3、分页实现

<el-pagination class="v3-page" @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="currentPage4":page-sizes="[5,10, 20, 30, 40]" :page-size="5" layout="total, sizes, prev, pager, next, jumper" :total="total"></el-pagination>

<script setup>
import { toRefs, ref, reactive} from 'vue'
const handleSizeChange = (val) => {console.log(`每页 ${val} 条`);pageSize.value = valgetListData();}const handleCurrentChange = () => {console.log(`当前页: ${val}`);page.value = valgetListData();}
</script>

vue3 Element-UI 插件 Pagination 显示为英文问题

在mains.js 里添加

import ElementPlus from 'element-plus'
import zhCn from 'element-plus/dist/locale/zh-cn.mjs'
// en是英文 zh-cn 是中文
app.use(ElementPlus, {locale: zhCn,
})

4、$message提示消息

<script setup>import { getCurrentInstance } from 'vue'import { getTenantDatas } from '@/api/v3'//使用messageconst instance = getCurrentInstance()const { proxy } = getCurrentInstance();instance.proxy.$message({message: `操作成功`,type: 'success',})
</script>

5、监听

5.1普通监听

<script setup>
import { toRefs, ref, reactive, watch} from 'vue'
const count = ref(0)
watch(count, (newValue, oldValue) => {if (newValue) {instance.proxy.$message({message: `我侦听到了count状态的变化，当前值为${newValue},从而处理相关逻辑`,type: 'success',})}})
</script>

5.2深度监听

<script setup>
import { toRefs, ref, reactive, watch} from 'vue'const user = reactive({name: 'zs',age: 18,})//深度监听watch(user,(value) => {console.log(value)instance.proxy.$message({message: `我侦听到了user年龄的变化，当前值为${value.age},从而处理相关逻辑`,type: 'success',})},{// 深度监听，，，当ref的值是一个复杂数据类型，需要深度监听deep: true,immediate: true})
</script>

6、onMounted钩子函数

<script setup>
import { toRefs, ref, reactive, onMounted} from 'vue'//注册周期钩子：钩子可以用来在组件完成初始渲染并创建 DOM 节点后运行代码onMounted(() => {instance.proxy.$message({message: "生命周期函数：onMounted",type: 'success',})})
</script>

7、reactive 和 ref区别

1、reactive 和 ref 是 Vue 3 中的两种响应式数据绑定方式，ref 适用于简单的响应式数据，而 reactive 则适用于复杂对象或数组的响应式数据。

2、ref：使用 .value 属性来访问和修改值。

3、reactive：可以直接访问和修改对象或数组的属性或元素，而无需使用 .value。

8、父子组件相互调用

1、父组件

<template><div id="example1" class="demo">
<child ref="childRef" :parentData="state" :parentFunction="myFunction" style="margin-top: 20px;" /></div>
</template>
<script setup>import { toRefs, ref, reactive, watch, unref, computed, onMounted } from 'vue'import child from './views/child.vue'import { getCurrentInstance } from 'vue'const state = reactive({patientInfo: null,ActiveIndex: 0,myData: '我是父组件里的属性',name: '孩子',age: '15',sex: '男',})
const myFunction = (item) => {instance.proxy.$message({message: '我是父组件里的方法',type: 'success',})}//调用子组件中的方法const childRef = ref(null);let handleChild = () => {childRef.value.changeData();}

2、子组件

<template><div id="example1" class="demo" style="border: 1px solid blue"><el-form :model="dataForm" label-width="80px" style="margin-bottom: 20px"><el-row><el-col :span="12"><el-form-item label="解释" prop="myData" style="width: 100%;"><el-input v-model="dataForm.myData" type="text" placeholder="请输入解释" /></el-form-item></el-col><el-col :span="12"><el-form-item label="姓名" prop="name" style="width: 100%;"><el-input v-model="dataForm.name" type="text" placeholder="请输入姓名" /></el-form-item></el-col></el-row><el-row><el-col :span="12"><el-form-item label="性别" prop="sex" style="width: 100%;"><el-input v-model="dataForm.sex" type="text" placeholder="请输入性别" /></el-form-item></el-col><el-col :span="12"><el-form-item label="年龄" prop="age" style="width: 100%;"><el-input v-model="dataForm.age" type="text" placeholder="请输入年龄" /></el-form-item></el-col></el-row></el-form><el-button size="mini" type="primary" @click="handleClick()">触发</el-button></div>
</template><script setup>import { toRefs, ref, reactive, watch, unref, defineExpose, computed } from 'vue'import { getCurrentInstance } from 'vue'//使用messageconst instance = getCurrentInstance()const { proxy } = getCurrentInstance();const props = defineProps({parentData: {type: Object,default: () => {return {}}},parentFunction: {type: Function,default: () => null,},})//计算属性computed函数const dataForm = computed(() => props.parentData);let handleClick = () => {//父组件中的方法props.parentFunction(dataForm);}//子组件定义方法供父组件调用const changeData = () => {instance.proxy.$message({message: '我是子组件里的方法',type: 'success',})}defineExpose({changeData,});</script><style>#app {font-family: Avenir, Helvetica, Arial, sans-serif;-webkit-font-smoothing: antialiased;-moz-osx-font-smoothing: grayscale;text-align: center;color: #2c3e50;margin-top: 60px;}
</style>

3、效果

9、完整demo代码

 9.1、app.vue

<template><div id="example1" class="demo"><el-row :gutter="10" style="margin-bottom: 10px"><el-col :span="1.5"><el-button type="primary" size="mini" @click="handleInsert">新增</el-button></el-col><el-col :span="1.5"><el-button type="primary" size="mini" @click="handleChild">子组件调用</el-button></el-col></el-row><el-table :data="tableData" border style="width: 100%" @selection-change="handleSelectionChange" :header-cell-style="{'text-align':'center'}"><el-table-column type="selection" width="55" align="center" /><el-table-column prop="date" label="日期" align="center"></el-table-column><el-table-column prop="name" label="姓名" align="left"></el-table-column><el-table-column prop="age" label="年龄" align="right"></el-table-column><el-table-column prop="sex" label="性别" align="left" :formatter="sexFormat"></el-table-column><el-table-column prop="phone" label="电话" align="left"></el-table-column><el-table-column prop="address" label="地址" :show-overflow-tooltip="true" align="left"></el-table-column><el-table-column prop="enableFlag" label="启用状态" :formatter="enableFlagFormat" align="left"></el-table-column><el-table-column label="操作" align="center" class-name="small-padding fixed-width" width="200"><template #default="scope"><el-button size="mini" type="text" @click="handleSelect(scope.$index,scope.row)">详情</el-button><el-button size="mini" type="text" @click="handleUpdate(scope.$index,scope.row)">修改</el-button></template></el-table-column></el-table><el-pagination class="v3-page" @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="currentPage4":page-sizes="[5,10, 20, 30, 40]" :page-size="5" layout="total, sizes, prev, pager, next, jumper" :total="total"></el-pagination><!-- 添加修改对话框 --><!--给el-dialog添加一个mpc-model-middle的class--><el-dialog v-model="addOpen" class="diaStyle" style="" :title="title"><el-form ref="ruleForm" :model="form" :inline="true" :rules="rules" label-width="80px" style="margin-bottom: 20px"><el-row><el-col :span="12"><el-form-item label="日期" prop="date" style="width: 100%;"><el-input v-model="form.date" type="text" placeholder="请输入日期" :disabled="disabled" /></el-form-item></el-col><el-col :span="12"><el-form-item label="姓名" prop="name" style="width: 100%;"><el-input v-model="form.name" type="text" placeholder="请输入姓名" :disabled="disabled" /></el-form-item></el-col></el-row><el-row><el-col :span="12"><el-form-item label="性别" prop="sex" style="width: 100%;"><el-select v-model="form.sex" placeholder="请选择性别" :disabled="disabled"><el-option v-for="item in sexOption" :key="item.value" :label="item.label" :value="item.value"></el-option></el-select></el-form-item></el-col><el-col :span="12"><el-form-item label="年龄" prop="age" style="width: 100%;"><el-input v-model="form.age" type="text" placeholder="请输入年龄" :disabled="disabled" /></el-form-item></el-col></el-row><el-row><el-col :span="12"><el-form-item label="联系方式" prop="phone" style="width: 100%;"><el-input v-model="form.phone" type="text" placeholder="请输入联系方式" :disabled="disabled" /></el-form-item></el-col><el-col :span="12"><el-form-item label="启用状态" prop="enableFlag" style="width: 100%;"><el-radio-group v-model="form.enableFlag" :disabled="disabled"><el-radio v-for="dict in enableOption" :key="dict.value" :label="dict.value">{{dict.label}}</el-radio></el-radio-group></el-form-item></el-col></el-row><el-row><el-col :span="24"><el-form-item label="地址" prop="address" style="width: 100%;"><el-input v-model="form.address" type="text" placeholder="请输入地址" :disabled="disabled" /></el-form-item></el-col></el-row></el-form><div class="dialog-footer"><el-button type="primary" @click="submitForm" v-preventReClick="2000" v-if="confDisabled">保 存</el-button><el-button @click="closeDialog">{{buttonName}}</el-button></div></el-dialog><child ref="childRef" :parentData="state" :parentFunction="myFunction" style="margin-top: 20px;" /><div style="border: 2px solid #f708bb;height: 80px;text-align: center;margin-top: 10px"><el-button size="mini" type="primary" @click="changCount" style="margin-top: 5px;display: flex;justify-content: flex-start;margin-left: 5px;">更改count的值</el-button><div>{{ count }}</div><div>姓名：{{ user.name }}，年龄：{{user.age}}岁</div></div><div style="border: 2px solid #008000;height: 160px;text-align: center;margin-top: 10px">暂时没想出来写点啥</div></div>
</template><script setup>import { toRefs, ref, reactive, watch, unref, computed, onMounted } from 'vue'import child from './views/child.vue'import { getCurrentInstance } from 'vue'import { getTenantDatas } from '@/api/v3'//使用messageconst instance = getCurrentInstance()const { proxy } = getCurrentInstance();const data = reactive({})const count = ref(0)const user = reactive({name: 'zs',age: 18,})function changCount() {count.value++user.age++}watch(count, (newValue, oldValue) => {if (newValue) {instance.proxy.$message({message: `我侦听到了count状态的变化，当前值为${newValue},从而处理相关逻辑`,type: 'success',})}})//深度监听watch(user,(value) => {console.log(value)instance.proxy.$message({message: `我侦听到了user年龄的变化，当前值为${value.age},从而处理相关逻辑`,type: 'success',})},{// 深度监听，，，当ref的值是一个复杂数据类型，需要深度监听deep: true,immediate: true})//注册周期钩子：钩子可以用来在组件完成初始渲染并创建 DOM 节点后运行代码onMounted(() => {instance.proxy.$message({message: "生命周期函数：onMounted",type: 'success',})})const state = reactive({patientInfo: null,ActiveIndex: 0,myData: '我是父组件里的属性',name: '孩子',age: '15',sex: '男',})//reactive 和 ref 是 Vue 3 中的两种响应式数据绑定方式，ref 适用于简单的响应式数据，而 reactive 则适用于复杂对象或数组的响应式数据。//ref：使用 .value 属性来访问和修改值。//reactive：可以直接访问和修改对象或数组的属性或元素，而无需使用 .value。let tableData = reactive([])// 数据相关 ?sortProperty=createdTime&sortOrder=DESC&pageSize=10&page=0const total = ref(0)const sortProperty = ref('createdTime')const sortOrder = ref('DESC')const pageSize = ref(2)const page = ref(1)// 获取数据的方法const getListData = async () => {instance.proxy.$message({message: "获取数据的方法",type: 'success',})const result = await getTenantDatas({sortProperty: sortProperty.value,sortOrder: sortOrder.value,pageSize: pageSize.value,page: page.value - 1})tableData = resulttotal.value = result.length}const handleSizeChange = (val) => {console.log(`每页 ${val} 条`);pageSize.value = valgetListData();}const handleCurrentChange = () => {console.log(`当前页: ${val}`);page.value = valgetListData();}// 执行方法getListData()//表单校验let rules = ref({date: [{ required: true, message: "日期不能为空", trigger: "blur" },],name: [{ required: true, message: "名称不能为空", trigger: "blur" },],address: [{ required: true, message: "地址不能为空", trigger: "blur" },],enableFlag: [{ required: true, message: "启用状态不能为空", trigger: "blur" },],age: [{ required: true, message: "启用状态不能为空", trigger: "blur" },],sex: [{ required: true, message: "启用状态不能为空", trigger: "blur" },],});// 详情let form = ref({});const ruleForm = ref(null); //表单let addOpen = ref(false);let disabled = ref(false);let buttonName = ref("取 消");let confDisabled = ref(false);let title = ref("");let handleSelect = (index, row) => {form.value = row;disabled.value = true;addOpen.value = true;confDisabled.value = false;buttonName.value = "关 闭";title.value = "查看详情"}//修改let handleUpdate = (index, row) => {form.value = row;disabled.value = false;addOpen.value = true;confDisabled.value = true;buttonName.value = "取 消";title.value = "修改信息"}//新增let handleInsert = () => {disabled.value = false;addOpen.value = true;confDisabled.value = true;buttonName.value = "取 消";title.value = "新增信息"}/** 提交按钮 */let submitForm = () => {const ff = unref(ruleForm);if (!ff) return;ruleForm.value.validate((valid) => {if (valid) {if (form.value.id != undefined) {instance.proxy.$message({message: 'id为：' + form.value.id + '的数据修改成功',type: 'success',})addOpen.value = false;reset();} else {instance.proxy.$message({message: '新增成功',type: 'success',})addOpen.value = false;reset();}}});};//关闭弹窗let closeDialog = () => {addOpen.value = false;reset();}let reset = () => {form.value = {}}let ids = ref(undefined);let banchParams = ref([]);//多选框选中数据let handleSelectionChange = (selection) => {ids.value = selection.map(item => item.id)banchParams.value = selectionconsole.log(ids.value)}let enableOption = [{"label": "启用","value": "0"}, {"label": "停用","value": "1"}];let enableFlagFormat = (item) => {return format(enableOption, item.enableFlag);};// 回显let format = (datas, value) => {var actions = [];Object.keys(datas).some((key) => {if (datas[key].value == ('' + value)) {actions.push(datas[key].label);return true;}})return actions.join('');}let sexOption = [{"label": "男","value": "0"}, {"label": "女","value": "1"}, {"label": "未知","value": "2"}];let sexFormat = (item) => {return format(sexOption, item.sex);};const myFunction = (item) => {instance.proxy.$message({message: '我是父组件里的方法',type: 'success',})}//调用子组件中的方法const childRef = ref(null);let handleChild = () => {childRef.value.changeData();}
</script><style>#app {font-family: Avenir, Helvetica, Arial, sans-serif;-webkit-font-smoothing: antialiased;-moz-osx-font-smoothing: grayscale;text-align: center;color: #2c3e50;margin-top: 60px;}.demo {border: 2px solid #ff0000;padding: 20px;}.v3-page {margin-top: 5px;display: flex;justify-content: flex-end;}.dialog-footer{display: flex;justify-content: flex-end;}
</style>

9.2、child.vue

<template><div id="example1" class="demo" style="border: 1px solid blue"><el-button size="mini" type="primary" @click="handleClick()" style="margin-bottom: 10px;display: flex;justify-content: flex-start;margin-left: -15px;">触发父组件方法</el-button><el-form :model="dataForm" label-width="80px"><el-row><el-col :span="12"><el-form-item label="解释" prop="myData" style="width: 100%;"><el-input v-model="dataForm.myData" type="text" placeholder="请输入解释" /></el-form-item></el-col><el-col :span="12"><el-form-item label="姓名" prop="name" style="width: 100%;"><el-input v-model="dataForm.name" type="text" placeholder="请输入姓名" /></el-form-item></el-col></el-row><el-row><el-col :span="12"><el-form-item label="性别" prop="sex" style="width: 100%;"><el-input v-model="dataForm.sex" type="text" placeholder="请输入性别" /></el-form-item></el-col><el-col :span="12"><el-form-item label="年龄" prop="age" style="width: 100%;"><el-input v-model="dataForm.age" type="text" placeholder="请输入年龄" /></el-form-item></el-col></el-row></el-form></div>
</template><script setup>import { toRefs, ref, reactive, watch, unref, defineExpose, computed } from 'vue'import { getCurrentInstance } from 'vue'//使用messageconst instance = getCurrentInstance()const { proxy } = getCurrentInstance();const props = defineProps({parentData: {type: Object,default: () => {return {}}},parentFunction: {type: Function,default: () => null,},})//计算属性computed函数const dataForm = computed(() => props.parentData);let handleClick = () => {//父组件中的方法props.parentFunction(dataForm);}//子组件定义方法供父组件调用const changeData = () => {instance.proxy.$message({message: '我是子组件里的方法',type: 'success',})}defineExpose({changeData,});</script><style>#app {font-family: Avenir, Helvetica, Arial, sans-serif;-webkit-font-smoothing: antialiased;-moz-osx-font-smoothing: grayscale;text-align: center;color: #2c3e50;margin-top: 60px;}
</style>

package.json中设置rules

"rules": {"no-undef": "off","no-unused-vars": "off","vue/multi-word-component-names": "off"}