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並前往https://download.tizen.org/misc/media/conference2012/tuesday/seacliff/2012-05-08-1515-1555-html5_canvas_2d_performance_tuning.pdf

HTML5 Canvas 2D Performance Tuning - Index of /

var ctx = canvas.getContext("2d"); ctx.arc(20, 50, 10, Math.PI, Math.PI * 2, false); ctx.moveTo(70, 50); ctx.arc(80, 50, 10, Math.PI, Math.PI * 2, false);.

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