W3Schools 在线编辑工具（TIY） V3.0
编辑的代码:
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<!DOCTYPE html> <html> <body> <p>要用到的图片：</p> <img src="/i/lamp.gif" id="lamp" /> <p>Canvas:</p> <button onclick="draw('repeat')">Repeat</button> <button onclick="draw('repeat-x')">Repeat-x</button> <button onclick="draw('repeat-y')">Repeat-y</button> <button onclick="draw('no-repeat')">No-repeat</button> <canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag.</canvas> <script type="text/javascript"> function draw(direction) { var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); ctx.clearRect(0,0,c.width,c.height); var img=document.getElementById("lamp") var pat=ctx.createPattern(img,direction); ctx.rect(0,0,150,100); ctx.fillStyle=pat; ctx.fill(); } </script> </body> </html>