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並前往https://www.demo2s.com/javascript/javascript-canvas-fillrect-fill-25-of-window-height.html

Javascript Canvas fillRect fill 25% of window-height - Demo2s ...

Copy var cvs = document.querySelector("canvas"); cvs.width = 800; cvs.height = 400; var ctx = cvs.getContext("2d"); ctx.fillStyle = "green"; ctx.

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