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並前往https://riptutorial.com/html5-canvas/example/19169/scaling-image-to-fit-or-fill-

html5-canvas Tutorial => Scaling image to fit or fill.

Learn html5-canvas - Scaling image to fit or fill. ... 2) - (img.height / 2) * scale; ctx.drawImage(img, x, y, img.width * scale, img.height * scale); } ...

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