<!DOCTYPE HTML> <html> <head> <meta charset="utf-8"> <title>直线</title> </head> <body> <canvas id="canvas" style="border:1px solid #aaa; display:block; margin:50px auto;"> 当前浏览器不支持canvas, 请更换浏览器后再试 </canvas> <script> window.onload = function(){ var canvas = document.getElementById("canvas"); canvas.width = 500; canvas.height = 500; var context = canvas.getContext("2d"); context.moveTo( 100, 100); context.lineTo( 300, 300); context.lineWidth = 10; context.strokeStyle = "red"; context.stroke(); } </script> </body> </html>
原文：http://www.cnblogs.com/wangjinke/p/5146804.html