摘要：
<!DOCTYPE html> <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <style> * { margin:0; padding: 0; 阅读全文
摘要：
<canvas id="canvas" width="120" height="40"></canvas> <script> var canvas = document.getElementById("canvas"); var context = canvas.getContext("2d"); 阅读全文