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编辑您的代码：
<!DOCTYPE html> <html> <body> <p>要使用的图片：</p> <img src="../i/eg_tulip.jpg" alt="tulip" id="tulip" style="margin-left:0px;" /> <p>Canvas:</p> <canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag. </canvas> <script> document.getElementById("tulip").onload=function(){ var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); var img=document.getElementById("tulip"); ctx.drawImage(img,90,130,90,80,20,20,90,80); }; </script> </body> </html>
查看结果: