Context.moveTo(20,20);
Context.lineTo(20,200);
Context.lineWidth=10;
Context.lineCap=”round”;
Context.lineJoin=”round”;
Context.stroke();
Context.setLineDash([5,15])
<html> <head> <meta charset="UTF-8"> <title>横线-竖线-斜线</title> <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" /> </head> <body> <canvas id="canvas" width="500" height="500"></canvas> <script type="text/javascript"> var oCanvas = document.getElementById("canvas"); var context = oCanvas.getContext("2d"); context.fillStyle = "#ededed"; context.fillRect(0, 0, 500, 500); //一直线 //1画线 context.moveTo(400,20);//移端点 context.lineTo(400,200);//画线 context.strokeStyle = "red";//线的颜色 //stroke() 方法会实际地绘制出通过 moveTo() 和 lineTo() 方法定义的路径。默认颜色是黑色 context.stroke();//画框 //竖线 context.moveTo(20,20);//移端点 context.lineTo(20,200);//画线 context.lineWidth = 4;//线宽度 context.lineCap = "round";//帽 context.strokeStyle = "red";//线的颜色 context.stroke();//画框 //横线 context.moveTo(20,200);//移端点 context.lineTo(200,200); context.stroke(); //斜线 context.moveTo(20,200);//移端点 context.lineTo(200,20); context.setLineDash([10,15]);//(1参)10虚线长度；(2)15这根线和下个线的距离; context.stroke(); </script> </body> </html>