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<!DOCTYPE html> <html> <body> <h1>canvas 元素</h1> <canvas id="myCanvas"> 您的浏览器不支持 canvas 标签。 </canvas> <script> var c = document.getElementById("myCanvas"); var ctx = c.getContext("2d"); ctx.fillStyle = "red"; ctx.fillRect(20, 20, 75, 50); //Turn transparency on ctx.globalAlpha = 0.2; ctx.fillStyle = "blue"; ctx.fillRect(50, 50, 75, 50); ctx.fillStyle = "green"; ctx.fillRect(80, 80, 75, 50); </script> </body> </html>