html5 canvas做手写签名
我用HTML5做了一个手写签名，运行在手机浏览器上，但是画出来效果总是很粗糙，曲线不够平滑，想找大侠指教
<!DOCTYPE HTML> <html> <head> <title>PhoneGap</title> <script type="text/javascript" charset="utf-8" src="phonegap.js"></script> <script type="text/javascript" src="jquery-1.5.1.js"></script> </head> <body> <canvas id='simple' width='600px' height='600px'>浏览器不支持canvas</canvas> <script> var canvas=null,context=null; function resetCanvas(){ canvas=document.getElementById('simple'); context=canvas.getContext('2d'); } $(document).ready(function(){ resetCanvas(); canvas.addEventListener('touchstart',function(evt){ evt.preventDefault(); context.beginPath(); context.moveTo(evt.touches[0].pageX,evt.touches[0].pageY); },false); canvas.addEventListener('touchmove',function(evt){ context.lineTo(evt.touches[0].pageX,evt.touches[0].pageY); context.stroke(); },false); canvas.addEventListener('touchend',function(evt){ },false); }); </script> </body> </html>