fabric.js 解決Uncaught DOMException: Failed to execute 'toDataURL' on 'HTML

參考：fabric.js 解決圖片跨域問題java      出現Uncaught DOMException: Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported錯誤，網上查找後是圖片跨域問題，設置img.crossOrigin='Anonymous'；便可解決這個問題

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