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並前往http://man.hubwiz.com/docset/JavaScript.docset/Contents/Resources/Documents/developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/getImageData.html

CanvasRenderingContext2D.getImageData()

JavaScript. var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); ctx.rect(10, 10, 100, 100); ctx.fill(); ...

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