vue2+element-ui转化为Vue3+element plus
后台管理系统：增删查改
vue2页面：

<template><div class="app-container"><div><el-form:model="queryParams"ref="queryForm"size="small":inline="true"class="tabel-form"label-width="80px"><el-form-item label="影片分类"><el-inputv-model="queryParams.categoryName"placeholder="请输入影片分类"clearablestyle="width: 180px;margin-right:20px;"@keyup.enter.native="handleQuery"/></el-form-item><el-form-item><el-button type="primary" icon="el-icon-search" size="mini" @click="handleQuery">搜 索</el-button><el-button icon="el-icon-refresh" size="mini" @click="resetQuery">重 置</el-button></el-form-item></el-form><el-buttonsize="mini"type="success"plainicon="el-icon-plus"@click="addFilmType"style="margin-bottom:10px">新增</el-button></div><el-table v-loading="loading" :data="dataList"><el-table-columnlabel="序号"align="center"type="index"width="140":show-overflow-tooltip="true"/><el-table-columnlabel="分类名称"align="center"prop="categoryName"width="140":show-overflow-tooltip="true"/><el-table-columnlabel="首页最多显示个数"align="center"prop="showQuantity"width="140":show-overflow-tooltip="true"/><el-table-column label="操作" align="center" class-name="small-padding fixed-width" width="200"><template slot-scope="scope"><div><el-buttonsize="mini"type="text"icon="el-icon-edit"@click="editFilmTypeName(scope.row)">编辑</el-button><el-buttonsize="mini"type="text"icon="el-icon-delete"@click="deleteFilmTypeName(scope.row)">删除</el-button></div></template></el-table-column></el-table><paginationv-show="total>0":total="total":page.sync="queryParams.pageNum":limit.sync="queryParams.pageSize"@pagination="getList"/><!-- 新增/编辑影片类型 --><el-dialog :title="title" :visible.sync="open" width="500px" append-to-body @close="cancel"><el-form ref="form" :model="form" :rules="rules"><el-form-item label="分类名称" prop="categoryName"><el-input v-model="form.categoryName" placeholder="请输入分类名称"></el-input></el-form-item><el-form-item label="首页最多显示个数" prop="showQuantity"><el-input v-model="form.showQuantity" type="number" :min="0" placeholder="请输入个数"></el-input></el-form-item></el-form><div slot="footer" class="dialog-footer"><el-button type="primary" @click="submitForm2">确定</el-button><el-button @click="cancel">取消</el-button></div></el-dialog></div>
</template><script>
import {sysVideoCategoryGetPage,sysVideoCategoryEdit,sysVideoCategoryDelete
} from '@/api/filmManagement/filmList'
import { convertTimestamp } from "@/utils/yun"export default {name: 'Task',dicts: ['audit_type'],data () {return {// 遮罩层loading: false,// 总条数total: 0,// 店铺带货任务表格数据dataList: [],// 弹出层标题title: '',// 是否显示弹出层open: false,// 查询参数queryParams: {categoryName: "",pageNum: 1,pageSize: 10},rules: {categoryName: [{ required: true, message: '分类名称不能为空', trigger: 'blur' }],showQuantity: [{ required: true, message: '个数不能为空', trigger: 'blur' }],},form: {categoryName: null,showQuantity: null},}},created () {this.getList()},methods: {convertTimestamp,/** 查询直播间用户等级 */getList () {this.loading = truesysVideoCategoryGetPage(this.queryParams).then((res) => {this.dataList = res.data.recordsthis.total = res.data.totalthis.loading = false}).catch(err => {this.loading = false})},/** 搜索按钮操作 */handleQuery () {this.queryParams.pageNum = 1this.getList()},/** 重置按钮操作 */resetQuery () {this.queryParams = {categoryName: null,pageNum: 1,pageSize: 10}this.handleQuery()},// 新增addFilmType () {this.open = truethis.title = '新增影片类型'},// 编辑editFilmTypeName (row) {this.form = { ...row }console.log(this.form)this.open = truethis.title = '编辑影片类型'},deleteFilmType (row) {sysVideoCategoryDelete(row.id).then((res) => {this.dataList = res.data.recordsthis.total = res.data.totalthis.loading = false}).catch(err => {this.loading = false})},// 删除deleteFilmTypeName (row) {this.$modal.confirm('是否确认删除该影片分类？').then(function () {return sysVideoCategoryDelete([row.id])}).then(() => {this.getList()this.$modal.msgSuccess('删除成功')}).catch(() => {})},submitForm2 () {this.$refs['form'].validate(valid => {if (valid) {sysVideoCategoryEdit(this.form).then((res) => {this.open = falsethis.getList()}).catch(err => {this.open = false})}})},cancel () {this.open = falsethis.form = {categoryName: null,showQuantity: null}},}
}
</script>
<style lang="scss" scoped>
.details-row {line-height: 34px;
}
.product-item {padding-right: 10px;
}
</style>

vue3页面：

<template><div class="app-container"><div><el-form:model="queryParams"ref="queryForm":inline="true"class="tabel-form"label-width="80px"><el-form-item label="影片分类"><el-inputv-model="queryParams.categoryName"placeholder="请输入影片分类"clearablestyle="width: 180px;margin-right:20px;"@keyup.enter.native="handleQuery"/></el-form-item><el-form-item><el-button type="primary" icon="Search" @click="handleQuery">搜 索</el-button><el-button icon="Refresh" @click="resetQuery">重 置</el-button><el-button type="success" icon="Plus" @click="addFilmType" plain>新 增</el-button></el-form-item></el-form></div><el-table v-loading="loading" :data="dataList" border><el-table-columnlabel="序号"align="center"type="index"width="240":show-overflow-tooltip="true"/><el-table-columnlabel="分类名称"align="center"prop="categoryName"width="240":show-overflow-tooltip="true"/><el-table-columnlabel="首页最多显示个数"align="center"prop="showQuantity"width="240":show-overflow-tooltip="true"/><el-table-column label="操作" align="left"><template #default="scope"><div><el-buttonsize="default"linktype="primary"icon="el-icon-edit"@click="editFilmTypeName(scope.row)">编辑</el-button><el-buttonsize="default"linktype="primary"icon="el-icon-delete"@click="deleteFilmTypeName(scope.row)">删除</el-button></div></template></el-table-column></el-table><paginationv-show="total > 0":total="total"v-model:page="queryParams.pageNum"v-model:limit="queryParams.pageSize"@pagination="getList"/><!-- 新增/编辑影片类型 --><el-dialog :title="title" v-model="open" width="700px" append-to-body @close="cancel"><el-form :model="form" :rules="rules" label-width="140px" ref="formRef"><el-form-item label="分类名称" prop="categoryName"><el-input v-model="form.categoryName" placeholder="请输入分类名称"></el-input></el-form-item><el-form-item label="首页最多显示个数" prop="showQuantity"><el-input v-model="form.showQuantity" type="number" :min="0" placeholder="请输入个数"></el-input></el-form-item></el-form><template #footer><div class="dialog-footer"><el-button type="primary" @click="submitForm2(formRef)">确定</el-button><el-button @click="cancel">取消</el-button></div></template></el-dialog></div>
</template><script setup>
import {sysVideoCategoryGetPage,sysVideoCategoryEdit,sysVideoCategoryDelete
} from '@/api/filmManagement/filmList'
import { ref, getCurrentInstance, reactive } from 'vue'
import {ElMessage,ElMessageBox
} from 'element-plus'
const { proxy } = getCurrentInstance()
const loading = ref(false)
const total = ref(0)
const dataList = ref([])
const open = ref(false)
const title = ref('')
const queryParams = reactive({categoryName: "",pageNum: 1,pageSize: 10
})const formRef = ref(null)
const rules = reactive({categoryName: [{ required: true, message: '分类名称不能为空', trigger: 'blur' }],showQuantity: [{ required: true, message: '个数不能为空', trigger: 'blur' }],
})
const form = ref({categoryName: 12,showQuantity: 0
})function getList () {loading.value = trueconsole.log(queryParams)sysVideoCategoryGetPage(queryParams).then((res) => {console.log(res)dataList.value = res.recordstotal.value = Number(res.total)loading.value = false}).catch(err => {loading.value = false})
}function handleQuery () {queryParams.pageNum = 1getList()
}function resetQuery () {queryParams.categoryName = nullqueryParams.pageNum = 1queryParams.pageSize = 10handleQuery()
}function addFilmType () {form.value = {categoryName: null,showQuantity: null}open.value = truetitle.value = '新增影片类型'
}function editFilmTypeName (row) {form.value = { ...row }open.value = truetitle.value = '编辑影片类型'
}function deleteFilmType (row) {sysVideoCategoryDelete(row.id).then((res) => {dataList.value = res.data.recordstotal.value = res.data.totalloading.value = false}).catch(err => {loading.value = false})
}function deleteFilmTypeName (row) {ElMessageBox.confirm('是否确认删除' + ' "' + row.categoryName + '" ' + '影片分类？').then(function () {return sysVideoCategoryDelete([row.id])}).then(() => {getList()ElMessage({type: 'success',message: '删除成功',})}).catch(() => {ElMessage({type: 'info',message: '删除取消',})})
}function submitForm2 () {if (!formRef.value) returnformRef.value.validate(valid => {if (valid) {sysVideoCategoryEdit(form.value).then((res) => {open.value = falseif (title.value = '新增影片类型') {ElMessage({type: 'success',message: '新增成功',})} else {ElMessage({type: 'success',message: '修改成功',})}getList()}).catch(err => {open.value = false})}})
}function cancel () {open.value = falseform.value = {categoryName: null,showQuantity: null}
}
getList()
</script>

html部分大体没有任何改变，js方面
1.script标签里面添加setup 语法糖
2.vue2 的data，都需要在vue3里面声明，
const loading = ref(false)
使用的时候：loading.value
3.vue2里面的方法，必须声明在methods,vue3里面，方法和变量都放在一个区域
vue3里面没有this，方法直接使用

element-ui和element plus大体相同，但是有些属性的使用发生了变化
1.按钮的图标

2.表格的自定义列模板

3.模态框的现实与隐藏

4.分页的当前页数和每页默认的条目个数
后面遇到变化再补充