在這一篇文章中我們用html5來實現一個線上的畫板，玩過你畫我猜的朋友今天也可以做一個簡單的你畫我猜小遊戲啦，效果如所示：
過程很簡單直接上代碼了：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>大碗幹拌的線上畫板</title><script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script><style type="text/css">#php100{ border:1px solid #ccc;}</style></head><body><canvas id="php100" width="500" height="400"></canvas><script type="text/javascript"> var canvas = document.getElementById('php100'); var p100=canvas.getContext("2d"); p100.lineWidth=5 p100.strokeStyle="red"; var paint=0; $("#php100").mousedown(function(e){ var mouseX = e.pageX - this.offsetLeft; var mouseY = e.pageY - this.offsetTop; paint=1; p100.moveTo(mouseX,mouseY); //起始位置 });$("#php100").mouseup(function(e){ paint=0;});$("#php100").mousemove(function(e){ var mouseX = e.pageX - this.offsetLeft; var mouseY = e.pageY - this.offsetTop; if(paint){p100.lineTo(mouseX,mouseY); //終止位置p100.stroke();//結束圖形 } });</script></body></html>
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