問題：
當我使用canvas的ctx.getImageData 方法時，js報錯，錯誤是 The operation is insecure.
解決：
我使用ctx.getImageData獲取canvas上的像素數據，但是我加載的圖片是一張跨域的圖片，所以js報錯
至於為什么js不允許操作跨域的圖片就不太清楚了
免責聲明！
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