大多数上下文操作都需要填充和描边操作,这两个操作的属性取决于strokeStyle和fillStyle。...(10,10,50,50);
7 context.fillStyle="rgba(0,0,255,0.5)";
8 context.fillRect(...(10,10,50,50);
7 context.fillStyle="rgba(0,0,255,0.5)";
8 context.fillRect(...、c2y为控制点;lineTo(x,y),从上一点开始,绘制一条直线到x,y为止;moveTo(x,y),将绘图游标移动到x、y,不绘制线;quadraticCurveTo(cx,cy,x,y),从上一点开始绘制一条二次曲线...context.textAlign="center";
8 context.textBaseline="middle";
9 context.fillText