echats 时间直方图示例-编程知识

echats 时间直方图示例

需求背景

某订单有N个定时任务，每个任务的执行时间已经确定，希望直观的查看该订单的任务执行趋势

查询SQL：

select UNIX_TIMESTAMP(DATE_FORMAT(exec_time,'%Y-%m-%d %H:%i')) execTime, count(*) from `order_detail_task` where order_no = '20240219085752308913310000110' GROUP by execTime order by execTime;

在这里插入图片描述
把查询结果copy出来，粘贴到 https://echarts.apache.org/zh/spreadsheet.html，转换成二维数组

把转换好的数据copy出来，代入到 baseData 中的 new Map() 中。

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>ECharts 时间直方图</title><!-- 引入 ECharts --><script src="https://cdn.jsdelivr.net/npm/echarts@5.1.2/dist/echarts.min.js"></script>
</head>
<body><!-- 创建一个容器来放置图表 --><div id="chart" style="width: 100%; height: 800px;"></div><script>// 创建 ECharts 实例var myChart = echarts.init(document.getElementById('chart'));// 初始数据, 数据库中统计结果, key为时间戳, value为个数let baseMap = new Map([[1708304400,8],[1708304460,4],[1708304520,8],[1708304580,4],[1708304640,5],[1708304700,3],[1708304760,10],[1708304820,2],[1708304880,6],[1708304940,5],[1708305000,6],[1708305060,5],[1708305120,6],[1708305180,5],[1708305240,7],[1708305300,6],[1708305600,5],[1708305660,6],[1708305720,9],[1708305780,8],[1708305840,4],[1708305900,10],[1708305960,13],[1708306020,10],[1708306080,13],[1708306140,10],[1708306200,15],[1708306260,10],[1708306320,9],[1708306380,13],[1708306440,11],[1708306500,6],[1708306560,1],[1708306860,2],[1708306920,9],[1708306980,5],[1708307040,4],[1708307100,6],[1708307160,3],[1708307220,4],[1708307280,3],[1708307340,3],[1708307400,5],[1708307460,4],[1708307520,3],[1708307580,2],[1708307640,4],[1708307700,3],[1708307760,6]]);// map集合的keysetlet keys = Array.from(baseMap.keys());// 最小key(起始时间戳)let startTime = Math.min(...keys);// 最大key(结束时间戳)let endTime = Math.max(...keys);let data = [];// 以分钟（60000ms）为步长for (let i = startTime; i <= endTime; i += 60) {if (baseMap.has(i)) {data.push([i*1000, baseMap.get(i)]);} else {// 第i分钟没有值,则value=0data.push([i*1000, 0]);}}option = {tooltip: {trigger: 'axis',position: function(pt) {return [pt[0], '10%'];}},title: {left: 'center',text: '直方图'},toolbox: {feature: {dataZoom: {yAxisIndex: 'none'},restore: {},saveAsImage: {},magicType: {type: ['line', 'bar']},dataView: {show: true,title: 'Data View'}}},xAxis: {type: 'time',maxInterval: 60000,boundaryGap: false,axisLabel: {rotate: 45},},yAxis: {type: 'value',boundaryGap: [0, '100%']},dataZoom: [{type: 'inside',filterMode: 'filter',start: 0,end: 30}, {start: 0,end: 30}],series: [{name: 'Fake Data',type: 'line',smooth: true,symbol: 'none',areaStyle: {},data: data}]};// 渲染图表myChart.setOption(option);</script>
</body>
</html>