demo.html
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>canvas</title> ???<link rel="stylesheet" type="text/css" href="demo.css"> ???<script type="text/javascript" src="demo.js"></script></head><body><canvas ?id="mycanvas" ??width="600px" height="800px" > ???<span>你的浏览器不支持canvas</span></canvas></body></html>
demo.js
window.onload=function() { ???createcanvas(); ???drawcanvas();} function createcanvas() ?{ ????var CANVAS=document.getElementById(‘mycanvas‘); ?????context=CANVAS.getContext(‘2d‘); }function drawcanvas() ?{ ???context.fillStyle="#eeeeef"; ???context.fillRect(0,0,600,800); ?for(var i=0;i<=10;i++) { ?????context.beginPath(); ?????context.arc(i*25,i*25,i*10,0,Math.PI*2,true); ?????context.closePath(); ?????context.fillStyle="rgba(255,0,0,0.25)"; ?????context.fill(); ?}}效果：
2017-09-08 08:36:44
HTML5 canvas绘制图形
原文地址：http://www.cnblogs.com/guangzhou11/p/7492808.html