一、背景

在让日常开发中很多时候会通过el-tab选项卡方式去分类统计数据，本文我们主要是针对统计中用到了echarts图表，在刚接触时可能会遇到默认选项卡可以正常显示图表数据，但是切换选项卡以后会出现图表大小出现问题，当然原因就是因为切换选项卡时，因为el-tab不显示的tab页样式有一个display: none的，这个属性使得echarts无法获取宽度，导致出错！所以在echarts填充以后并没有实时计算高度，所以导致大小不一致的情况（当然 你可以预先设置长和宽，就不会出现问题），解决这个问题的办法就是让重新加载切换的echart组件即可。

二、解决方案

通过给echarts组件添加v-if,切换选项卡时，动态改变v-if的值即可，v-if为true，会重新加载dom,反之会销毁dom，直接上代码
关键代码
在这里插入图片描述

在这里插入图片描述

完整代码如下

<!-- 项目统计 -->
<template>
	<div class="list-main-content">
		<div class="header-box">
			<div class="header-statis-row">
				<div class="row-item">
					<div class="col-item">
						<div class="item-val">{{ statisModel.talktotal }}</div>
						<div class="item-label">在谈项目数</div>
					</div>
					<div class="divider-column"> </div>
					<div class="col-item">
						<div class="item-val">{{ statisModel.settletotal }}</div>
						<div class="item-label">落户项目数</div>
					</div>
					<div class="divider-column"> </div>
					<div class="col-item">
						<div class="item-val">{{ statisModel.identitytotal }}</div>
						<div class="item-label">认定项目数</div>
					</div>
				</div>
			</div>
		</div>
		<!--数据列表-->
		<div class="content-box" style="align-items:flex-start;">
			<el-tabs v-model="activeName" style="width: 100%;" @tab-click="handleClick">
				<el-tab-pane label="在谈项目" name="first">
					<TalkingStatis v-if="isTalkingStatis" ref="TalkingStatisRef"></TalkingStatis>
				</el-tab-pane>
				<el-tab-pane label="落户项目" name="second">
					<SettleStatis v-if="isSettleStatis" ref="SettleStatisRef"></SettleStatis>
				</el-tab-pane>
				<el-tab-pane label="认定项目" name="third">
					<IdentifyStatis v-if="isIdentifyStatis" ref="IdentifyStatisRef"></IdentifyStatis>
				</el-tab-pane>
			</el-tabs>
		</div>
	</div>
</template>
<script>
	import {
		getCurrentInstance,
		ref,
		reactive,
		toRefs,
		onMounted,
		computed,
		nextTick,
		watch
	} from 'vue';
	import {
		useRouter,
		useRoute
	} from 'vue-router'
	import {
		useStore
	} from 'vuex';
	import {
		getProjectNumber
	} from '@/service/index.js'
	import {
		MessageBox,
		MessageSuccess,
		MessageError,
		FormatDateTime,
		stampToTime2
	} from "@/plugin/utils.js";
	import moment from 'moment'
	import TalkingStatis from './TalkingStatis.vue'
	import SettleStatis from './SettleStatis.vue'
	import IdentifyStatis from './IdentifyStatis.vue'
	export default {
		components: {
			TalkingStatis,
			SettleStatis,
			IdentifyStatis
		},
		setup(props, context) {
			const {
				proxy
			} = getCurrentInstance(); // 获得 vue 实例对象
			const $router = useRouter()
			const $store = useStore()
			const state = reactive({
				isTalkingStatis: true,
				isSettleStatis: false,
				isIdentifyStatis: false,
				activeName: "first",
				part: 'dfc-statistic',
				statisModel: {
					identitytotal: 0,
					settletotal: 0,
					talktotal: 0
				}

			})
			const initData = () => {

				getProjectNumber(state.part).then(res => {
					if (res.data.code == 200) {
						console.log(res, '统计');
						state.statisModel = res.data.data
					}
				})
			}
			const handleClick = (tab, event) => {
				console.log(tab, "tab")
				if (tab.paneName == "first") {
					state.isTalkingStatis = true;

				} else if (tab.paneName == "second") {
					state.isSettleStatis = true;
				} else {
					state.isIdentifyStatis = true;
				}

			}
			onMounted(() => {
				initData();
			});



			return {
				...toRefs(state),
				handleClick
			}
		},
	}
</script>
<style lang="scss" scoped>
	.header-box {
		.header-statis-row {
			@include layout(center, center, column);
			width: 100%;
			background-color: #FFFFFF;
			box-shadow: 2px 2px 4px #e8e4e4;

			.row-item {
				@include layout(center, center, row);
				// background-color: rgb(214, 235, 162);

				.col-item {
					@include wh-size(210px, 80px);
					@include layout(center, center, column);
					margin: 10px;

					.item-label {
						font-size: 18px;
						font-family: Alibaba PuHuiTi;
						font-weight: 500;
						color: #28344A;
						margin-top: 10px;
					}

					.item-val {
						font-size: 30px;
						font-family: DIN;
						font-weight: bold;
						color: #5074F7;
					}
				}

				.divider-column {
					@include wh-size(1px, 44px);
					border-right: 1px solid #99A4C4;


				}
			}
		}
	}

	:deep().el-tabs__content {
		// padding: 32px;
		color: #6b778c;
		font-size: 32px;
		font-weight: 600;
		height: 100%;
	}

	:deep().el-tabs__content {
		overflow: hidden;
		position: relative;
		height: 100%;
	}

	.el-tab-pane {
		height: 93%;
		// height: calc(100vh - 110px);
		overflow-y: auto;
	}

	.el-tabs {
		height: 100%;
	}
</style>