BootWiki教程网
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>BootWiki 教程网</title> </head> <body> <canvas height="150" id="myCanvas" style="border:1px solid #d3d3d3;" width="300"> 您的浏览器不支持 HTML5 canvas 标签。 </canvas> <script> var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); ctx.fillStyle="red"; ctx.fillRect(20,20,75,50); ctx.fillStyle="blue"; ctx.globalCompositeOperation="source-over"; ctx.fillRect(50,50,75,50); ctx.fillStyle="red"; ctx.fillRect(150,20,75,50); ctx.fillStyle="blue"; ctx.globalCompositeOperation="destination-over"; ctx.fillRect(180,50,75,50); </script> </body> </html>
运行结果