ElemeFE / ElemeFE/element-react
npm start 编译成功，可访问http://localhost:3000页面却报错，很无奈,求大牛看到解决下
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Description
### Description
报错信息如下图所示，canvas.jsx 中的this.source = this.document[2].match(/```(.*)\n([^]+)```/)我输出this.source是null
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