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- JavaScript Canvas怎么操作_如何绘制图形和动画【教程】
- Canvas绘图需先获取2D上下文ctx=canvas.getContext(‘2d’),再用fillRect/strokeRect画矩形、arc画圆、beginPath+路径方法画图形;动画须用requestAnimationFrame实现清屏→绘制→循环;drawImage需在img.onload中调用以防未加载。
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