如何使用 HTML5 画布和 JavaScript 裁剪图像以便离线裁剪图像? [英]How can i crop image using the HTML5 canvas and JavaScript in order to crop an image offline?
使用HTML 5 Canvas时如何在png图像上划定透明区域? [英]How can I delimit a transparent area on png image when I'm using HTML 5 Canvas?
如何使用javascript和html滑块(不使用画布)更改图像的对比度 [英]How can I change contrast of an image by using javascript and html slider (not using canvas)
使用toDataURL(“image / png”)时如何捕获HTML5 Canvas的背景? [英]How can I capture the background of HTML5 Canvas when using toDataURL(“image/png”)?