代码
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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width,initial-scale=1.0" />
<title>Echarts Example</title>
</head>
<body>
<div id="main" style="width: 600px; height: 400px;"></div>
<script src="//cdn.bootcss.com/echarts/4.5.0/echarts.js"></script>
<script type="text/javascript">
const myChart = echarts.init(document.getElementById('main'));
let len = 0;
const random = (min = 0, max = 180) => Math.round(Math.random() * (max - min) + min);
const range = (from, to) => {
const result = [];
for (let i = from; i <= to; i++) {
result.push(`X-${i}`);
}
return result;
};
const option = {
// appendData 接口不会更改初始渲染后的任何组件
// 所以需要预留足够的空间来容纳追加的图案
xAxis: { type: 'category', data: range(1, 20) },
// 同样的，在 y 轴上也需要设定好序列的最大值，以容纳追加的图案
yAxis: { type: 'value', max: 180 },
series: [
{
type: 'bar',
data: [random(), random()],
},
],
};
myChart.setOption(option);
setInterval(() => {
myChart.appendData({ seriesIndex: 0, data: [random()] });
}, 300);
</script>
</body>
</html>
运行结果