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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: 1020px; height: 400px;"></div>
<button id="export">export png</button>
<script src="//cdn.bootcss.com/echarts/4.5.0/echarts.js"></script>
<script type="text/javascript">
const random = (min, max) => Math.round(Math.random() * (max - min) + min);
const myChart = echarts.init(document.getElementById('main'));
const option = {
toolbox: { feature: { saveAsImage: {} } },
dataZoom: [{ type: 'slider', xAxisIndex: 0, start: 14, end: 50 }],
grid: {},
xAxis: { type: 'category' },
yAxis: { type: 'value' },
series: [
{
data: genSeriesData(20),
type: 'bar',
},
],
};
myChart.setOption(option);
// 此處實現自定義的圖片導出過程
document.getElementById('export').addEventListener('click', () => {
const dz = myChart.getModel().option.dataZoom[0];
// 記錄當前時刻的偏移值
const oldStart = dz.start;
const oldEnd = dz.end;
// 通過 action 將dataZoom組件數值范圍設置為 0%-100%
myChart.dispatchAction({ type: 'dataZoom', start: 0, end: 100 });
// 監聽渲染完成事件
myChart.on('finished', download);
function download() {
const img = myChart.getDataURL({
backgroundColor: '#fff',
// 導出時排除 dataZoom 組件
excludeComponents: ['toolbox', 'dataZoom'],
pixelRatio: 1,
});
const anchor = document.createElement('a');
anchor.href = img;
anchor.setAttribute('download', 'test.jpeg');
anchor.click();
// 移除事件監聽，避免多次導出
myChart.off('finished', download);
myChart.dispatchAction({ type: 'dataZoom', start: oldStart, end: oldEnd });
}
});
function genSeriesData(len) {
const result = [];
for (let i = 0; i < len; i += 1) {
const node = [`S${i + 1}`, random(10, 100)];
result.push(node);
}
return result;
}
</script>
</body>
</html>
運行結果