源代码:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> </head> <body> <img id="scream" src="/images/htmlcss/img_the_scream.jpg"> <canvas id="myCanvas" width="220" height="277" style="border:1px solid #d3d3d3;"> 您的浏览器不支持 HTML5 canvas 标签。 </canvas> <script> document.getElementById("scream").onload=function() { var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); var img=document.getElementById("scream"); ctx.drawImage(img,0,0); var imgData=ctx.getImageData(0,0,c.width,c.height); // 反转颜色 for (var i=0;i<imgData.data.length;i+=4) { imgData.data[i]=255-imgData.data[i]; imgData.data[i+1]=255-imgData.data[i+1]; imgData.data[i+2]=255-imgData.data[i+2]; imgData.data[i+3]=255; } ctx.putImageData(imgData,0,0); }; </script> </body> </html>
运行结果：
Fmpq工具