html5 canvas绘制线条,可以指定开始和结束点
<!DOCTYPE html> <html> <body> <canvas id="myCanvas" width="200" height="100" style="border:1px solid #c3c3c3;"> Your browser does not support the HTML5 canvas tag. </canvas> <script type="text/javascript"> var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); ctx.moveTo(10,10); ctx.lineTo(150,50); ctx.lineTo(10,50); ctx.stroke(); </script> </body> </html>