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並前往https://riptutorial.com/html5-canvas/example/18140/arc-with-both-fill-and-stroke

html5-canvas Tutorial => Arc with both fill and stroke

PI } drawArc(arc,'skyblue','gray',4); function drawArc(a,fill,stroke,strokewidth){ ctx.beginPath(); ctx.arc(a.cx,a.cy,a.innerRadius,a.startAngle,a.

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