1、父组件引入

<template>
	<div>
		<!-- 标签展示执行人 -->
		<div>
			<el-button @click="openHandle">选择执行人</el-button>
		</div>
		<el-tag style="margin-right:5px" v-for="selectList" :key="tag.nickName" closable @close="deleteHandle(tag)">
			{{ tag.nickName }}
		</el-tag>
		<!-- 标签展示执行人 -->
		...
		<!-- 执行人数据对话框组件 -->
		<SelectUsers :selectList="selectList" v-if="selectVisible" @closeHandle="closeHandle" />
		<!-- 执行人数据对话框组件 -->
		...
	<div>
</template>
<script>
	import SelectUsers from "@/components/selectUsers"  // 执行人对话框组件
	export default {
		components: { SelectUsers },  // 注册组件
		data() {
			return {
				selectList: [],  // 标签展示的执行人列表
				selectVisible: false,  // 是否显示选择执行人对话框
			}
		},
		methods: {
			openHandle(){
				this.selectVisible = true  // 显示选择执行人对话框
			},
			closeHandle(list) {  // list：对话框选中需要回显的数据
				if (list) {
					this.$set(this, 'selectList', list)  // 将原来的数据替换成新的
				}
				this.selectVisible = false  // 关闭选择执行人对话框
			},
			deleteHandle(tag) {
				let selectList = this.selectList
				selectList.splice(selectList.indexOf(tag), 1);
				this.$set(this, 'selectList', selectList)
			},
		}
		...
	}
</script>

2、子组件，创建一个名为selectUsers的组件进行代码编写

<template>
	<el-dialog :visible="true" title="选择执行人" append-to-body width="850px" :before-close="cancelHandle">
		<!--查询条件-->
		<el-form :model="queryParams" ref="queryForm" size="small" :inline="true" label-width="68px">
			<el-form-item label="用户名称" prop="nickName">
				<el-input v-model="queryParams.nickName" placeholder="请输入用户名称" clearable style="width: 240px" @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>
		<!--表格数据-->
		<el-table :checkbox-config="{ reserve: true }" :row-key="rowKeys" v-loading="loading" :data="userList" @selection-change="handleSelectionChange" @select-all="handleSelectAll"  @select="selectHandle" ref="multipleTable">
			<el-table-column type="selection" width="50" align="center" :reserve-selection="true" />
			<el-table-column label="用户编号" align="center" key="userName" prop="userName" />
			<el-table-column label="用户名称" align="center" key="nickName" prop="nickName" :show-overflow-tooltip="true" />
			<el-table-column label="组织架构" align="center" key="lancyDepartmentName" prop="lancyDepartmentName" :show-overflow-tooltip="true" />
		</el-table>
		<pagination v-show="total > 0" :total="total" :page.sync="queryParams.pageNum" :limit.sync="queryParams.pageSize" @pagination="getList" />
		<span slot="footer">
			<el-button type="primary" @click="confirmHandle">确认</el-button>
			<el-button @click="cancelHandle">取消</el-button>
		</span>
	</el-dialog>
</template>

<script>
import {
	listUser
} from "@/api/system/user";   // 调取接口获取用户数据
export default {
	name: "UserList",
	props: ['selectVisible', 'selectList'],
	data() {
		return {
			visible: false,
			// 遮罩层
			loading: true,
			// 选中数组
			selected: [],
			// 总条数
			total: 0,
			// 用户表格数据
			userList: [],
			// 查询参数
			queryParams: {
				pageNum: 1,
				pageSize: 10,
				nickName: undefined,
			},
			deleteArr: [],
			deepSelectList: []
		};
	},
	watch: {
		selected(){
			this.dealDataHandle()
		},
		selectVisible(val) {
			this.visible = val
		},
	},
	created() {
		this.getList();
	},
	methods: {
		// 多选框选中数据
		handleSelectionChange(selection) {
			// console.log(selection, 'selection')
			this.selected = selection.map(item => item);

			this.single = selection.length != 1;
			this.multiple = !selection.length;
		},
		// 单个选择
		selectHandle(list, item) {
			if (list.includes(item)) {
				//勾选时做的事
				this.deleteArr.forEach((item, i) => {
					if (item.userId == item.userId) {
						this.deleteArr.splice(i, 1)
					}
				})
				console.log(this.deleteArr, '成功');
			} else {
				//取消勾选时做的事，arguments[1]是当前取消勾选的项
				if (this.deleteArr.includes(item)) return
				this.deleteArr.push(arguments[1])
			}
		},
		//该方法是当页全选的方法
		handleSelectAll(list,item) {
			if(list.length == 0){
				this.deleteArr.push(...this.userList)
			}else{
				this.$props.selectList.forEach(item=>{
					this.userList.forEach(val=>{
						if(val.userId == item.userId) return
						this.deleteArr.push(val)
					})
				})
			}
		},
		// 分页关联
		rowKeys(row) {
			return row.userId
		},
		
		dealDataHandle(){
			let selectList= []
			if (this.$props.selectList) {
				selectList= this.$props.selectList
				this.deleteArr.forEach(val => {
					selectList.forEach((item, i) => {
						if (item.userId == val.userId) {
							selectList.splice(i, 1)
						}
					})
				})
			} else {
				selectList = this.selected
			}

			let data = [...selectList, ...this.selected]
			const map = new Map();
			const newArr = data.filter(v => !map.has(v.userId) && map.set(v.userId, 1));
			return newArr
		},
		confirmHandle() {
			let data = this.dealDataHandle()
			this.$emit('closeHandle', data)
		},
		cancelHandle() {
			this.$emit('closeHandle',this.deepSelectList)
			this.$refs.multipleTable.clearSelection();

		},
		/** 查询用户列表 */
		getList(type) {
			this.loading = true;
			listUser(this.addDateRange(this.queryParams, this.dateRange)).then(response => {
				this.userList = response.rows;
				this.total = response.total;
				this.loading = false;
			}).finally(() => {
				if(this.deepSelectList.length == 0){
					this.deepSelectList = JSON.parse(JSON.stringify(this.$props.selectList));
				}
				this.toggleSelection(this.$props.selectList)

			})
		},
		toggleSelection(rows) {
			// console.log(rows)
			if (!rows) return
			this.userList.forEach((item, index) => {
				if (rows.findIndex(v => v.userId == item.userId) >= 0) {
					this.$refs.multipleTable.toggleRowSelection(
						this.$refs.multipleTable.data[index],
						true
					);
				}
			})
		},
		/** 搜索按钮操作 */
		handleQuery() {
			this.queryParams.pageNum = 1;
			this.getList();
		},
		/** 重置按钮操作 */
		resetQuery() {
			this.dateRange = [];
			this.resetForm("queryForm");
			this.handleQuery();
		},
	},
};
</script>