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 echarts：一个基于 JavaScript 的开源可视化图表库。

目录

效果

一、介绍

 1、官方文档：Apache ECharts

2、官方示例

二、准备工作

1、安装依赖包

 2、示例版本 

三、使用步骤

1、在单页面引入 ' echarts '

2、指定容器并设置容器宽高

3、数据处理（关键点）

四、完整示例

tips

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效果

一、介绍

 1、官方文档：Apache ECharts

Apache EChartsApache ECharts，一款基于JavaScript的数据可视化图表库，提供直观，生动，可交互，可个性化定制的数据可视化图表。https://echarts.apache.org/zh/index.html

2、官方示例

二、准备工作

1、安装依赖包

npm install echarts --save

 2、示例版本 

"echarts": "^5.4.2",

三、使用步骤

1、在单页面引入 ' echarts '

import * as echarts from "echarts";

注：上面的代码会引入 ECharts 中所有的图表和组件，如果你不想引入所有组件，也可以使用 ECharts 提供的按需引入的接口来打包必须的组件。详见官方文档：在项目中引入 ECharts - 入门篇 - Handbook - Apache ECharts

2、指定容器并设置容器宽高

<template><div id="main"></div>
</template><script>import * as echarts from "echarts";export default {name: "mutiYAxis",data() {return {};},methods: {initChart() {let data = this.datalet chartDom = document.getElementById("main");let myChart = echarts.init(chartDom);let option;...详见完整示例   },},};
</script><style scoped>#main {width: 1000px;height: 500px;}
</style>

3、数据处理（关键点）

      let xAxisData = [];let series = [];let index = 1;let seriesNames = [];let seriesUnit = [];let yAxis = [];let timeData = [];data.sort(this.sortByLength);data.forEach((_series, i) => {let _yAxis = [];let arrEle = [];let nameUnit = '';_series.unit ? (nameUnit = '(' + _series.unit + ')') : (nameUnit = '');_series.dataList.forEach((item) => {let { value, time } = item;timeData.push(time);arrEle = [time, value];_yAxis.push(arrEle);});seriesNames.push(_series.seriesName);seriesUnit.push(_series.unit);if (yAxis.length < 2) {yAxis.push({name: _series.seriesName + nameUnit,nameTextStyle: {fontSize: 14,fontcolor: '#fff',fontWeight: 'bolder',},splitLine: {show: false},axisLabel: {formatter: '{value} ',},});}let _item = {name: _series.seriesName,type: 'line',smooth: true,showAllSymbol: false,symbol: 'emptyCircle',data: _yAxis,connectNulls: true,};if (index == 2) {_item.yAxisIndex = 1;}series.push(_item);index++;});xAxisData = this.sortByTime(timeData);

注：部分方法的完整版在完整示例展示

四、完整示例

<template><div class="multipleDiscounting"><div id="main"></div></div>
</template>
<script>
import * as echarts from "echarts";
export default {name: "multipleDiscounting",data() {return {dataArr: [{seriesName: "折现一",unit: '',dataList: [{value: 0,time: "2023-12-05 01:32:00"},{value: 0,time: "2023-12-05 02:06:50"},{value: 0,time: "2023-12-05 07:13:56"},{value: 11.5,time: "2023-12-05 07:56:06"},{value: 36.3,time: "2023-12-05 10:18:12"},{value: 51.8,time: "2023-12-05 12:34:49"},{value: 21.9,time: "2023-12-05 14:36:05"},{value: 24.2,time: "2023-12-05 15:40:00"},{value: 13.7,time: "2023-12-05 16:36:22"},{value: 0,time: "2023-12-05 17:14:31"},],},{seriesName: "折现二",unit: '',dataList: [{value: 0,time: "2023-12-05 00:28:16"},{value: 0,time: "2023-12-05 00:31:56"},{value: 0,time: "2023-12-05 02:10:56"},{value: 0,time: "2023-12-05 02:21:56"},{value: 0,time: "2023-12-05 06:50:22"},{value: 36.6,time: "2023-12-05 10:39:55"},{value: 34.1,time: "2023-12-05 10:50:55"},{value: 50.2,time: "2023-12-05 12:00:36"},{value: 25.9,time: "2023-12-05 14:36:05"},{value: 22.1,time: "2023-12-05 14:37:33"},{value: 24.9,time: "2023-12-05 15:50:10"},{value: 12.1,time: "2023-12-05 16:56:11"},{value: 9.3,time: "2023-12-05 17:15:59"}],},]};},mounted() {this.$nextTick(() => {this.initChart(this.dataArr);});},methods: {initChart(data) {let chartDom = document.getElementById("main");let myChart = echarts.init(chartDom);let option;let xAxisData = [];let series = [];let index = 1;let seriesNames = [];let seriesUnit = [];let yAxis = [];let timeData = [];data.sort(this.sortByLength);data.forEach((_series, i) => {let _yAxis = [];let arrEle = [];let nameUnit = '';_series.unit ? (nameUnit = '(' + _series.unit + ')') : (nameUnit = '');_series.dataList.forEach((item) => {let { value, time } = item;timeData.push(time);arrEle = [time, value];_yAxis.push(arrEle);});seriesNames.push(_series.seriesName);seriesUnit.push(_series.unit);if (yAxis.length < 2) {yAxis.push({name: _series.seriesName + nameUnit,nameTextStyle: {fontSize: 14,fontcolor: '#fff',fontWeight: 'bolder',},splitLine: {show: false},axisLabel: {formatter: '{value} ',},});}let _item = {name: _series.seriesName,type: 'line',smooth: true,showAllSymbol: false,symbol: 'emptyCircle',data: _yAxis,connectNulls: true,};if (index == 2) {_item.yAxisIndex = 1;}series.push(_item);index++;});xAxisData = this.sortByTime(timeData);option = {grid: {containLabel: true,},tooltip: {trigger: 'axis',borderRadius: 4,formatter: function (params) {let result = params[0].axisValueLabel;let unit = '';for (let i = 0; i < params.length; i++) {seriesUnit[i] ? (unit = seriesUnit[i]) : (unit = '');let param = params[i];result += '<br/>' + param.marker + param.seriesName + '  ' + param.value + unit;}return result;},},legend: {type: 'scroll',width: '90%',data: seriesNames,},calculable: true,xAxis: [{type: 'category',boundaryGap: false,data: xAxisData,},],yAxis,dataZoom: [{type: 'inside',},],series,};option && myChart.setOption(option);},// 根据 dataList.length 从大到小排序sortByLength(a, b) {return b.dataList.length - a.dataList.length;},// 根据 日期时间 去重 从小到大排序sortByTime(arr) {return [...new Set(arr)].map((item) => new Date(item)).sort((a, b) => a.getTime() - b.getTime()).map((time) => this.timeFormatConversion(time));},// 时间格式转换timeFormatConversion(chinaStandard) {let date = new Date(chinaStandard);let Y = date.getFullYear();let M = (date.getMonth() + 1).toString().padStart(2, '0');let D = date.getDate().toString().padStart(2, '0');let h = date.getHours().toString().padStart(2, '0');let m = date.getMinutes().toString().padStart(2, '0');let s = date.getSeconds().toString().padStart(2, '0');return `${Y}-${M}-${D} ${h}:${m}:${s}`;},},
};
</script><style lang="less" scoped>
#main {width: 1000px;height: 500px;
}
</style>

tips

1、X轴的数据一定要合并去重并排序

2、series的数据格式一定是数组嵌套数组