html5 canvas
html5 canvas 标签，提供了画图功能；可参考：http://www.w3schools.com/html5/tag_canvas.asp
简单例子：
<!DOCTYPE HTML><html><head><meta charset="utf-8" /><title>html 5 test</title><script type="text/javascript">function init() {var canvas = document.getElementById("canvas");if (canvas.getContext) {var ctx = canvas.getContext("2d");ctx.fillStyle = "rgb(200,0,0)";ctx.fillRect (10, 10, 55, 50);ctx.fillStyle = "rgba(0, 0, 200, 0.5)";ctx.fillRect (30, 30, 55, 50);}}</script></head><body ><canvas id="canvas"></canvas></body></html>
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