KehaoWu opened a new issue #14210:
URL: https://github.com/apache/echarts/issues/14210
### Version
5.0.1
### Steps to reproduce
调用 getDataURL 时会报错
```
TypeError: Cannot read property 'dpr' of undefined
setContextTransform
node_modules/echarts/node_modules/zrender/lib/canvas/graphic.js:378
375 | }
376 | function setContextTransform(ctx, el) {
377 | var m = el.transform;
> 378 | var dpr = ctx.dpr || 1;
379 | if (m) {
380 | ctx.setTransform(dpr * m[0], dpr * m[1], dpr * m[2], dpr *
m[3], dpr * m[4], dpr * m[5]);
381 | }
```
### What is expected?
正常运行，导出图片
### What is actually happening?
报错
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