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最新推荐文章于 2024-10-11 07:34:22 发布

weixin_34377065

最新推荐文章于 2024-10-11 07:34:22 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/Mr-Joe/p/3365106.html

  window.onload = function () {

            var img = new Image();
            img.src = '1.gif';
            var ctx = document.querySelector('#aa').getContext('2d');

            img.onload = function () {
                ctx.drawImage(img, 0, 0, img.width, img.height, 0, 0, 400, 400);

                var a = ctx.getImageData(0, 0, 100, 100), data = a.data;

                for (var i = 0, len = data.length; i < len; i += 4) {
                    data[i] = 0; //r
                    data[i + 1] = 0; //g
                    data[i + 2] = 0; //b
                    data[i+3]=255; //alpha 

                }

                ctx.putImageData(a, 0, 0);

            }

        }

转载于:https://www.cnblogs.com/Mr-Joe/p/3365106.html