// 创建 Canvas 元素<canvasid='myCavans'width='200'height='100'></canvas>// JS 绘制<scripttype='text/javascript'>varc=document.getElementById('myCavans');varcxt=c.getContext('2d');//创建 context 对象cxt.fillStyle='#f00';//染色cxt.fillRect(0,0,150,75);//规定形状、尺寸和位置,从(...