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並前往https://developers.weixin.qq.com/miniprogram/dev/api/canvas/CanvasContext.drawImage.html

CanvasContext.drawImage(string imageResource, number sx ...

drawImage (string imageResource, number sx, number sy, number sWidth, number sHeight, number dx, number dy ... imageResource的左上角在目标canvas 上x 轴的位置 ...

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