Cross-platform image decoder(png/jpeg/gif) and encoder(png/jpeg) for Node.js node.js轻量级跨平台图像编解码库 [b]Features 功能特性[/b] [list=1] [*]Lightweight:no need to install any image processing library.[/*] [*]轻量级：无需安装任何图像处理库。[/*] [*]Cross-platform: Released a compiled .node file on windows, just download and start.[/*] [*]跨平台：Windows下发布了编译好的.node文件,下载就能用。[/*] [*]Easy-to-use: Provide jQuery-like chaining API.Simple and reliable![/*] [*]方便用：jQuery风格的API，简单可依赖。[/*] [/list] [b]Installation 安装[/b] [b]API 接口[/b] node-images provide jQuery-like Chaining API,You can start the chain like this: node-images 提供了类似jQuery的链式调用API,您可以这样开始: [b]images(file)[/b] Load and decode image from file从指定文件加载并解码图像 [b]images(width, height)[/b] Create a new transparent image创建一个指定宽高的透明图像 [b]images(buffer[, start[, end]])[/b] Load and decode image from a buffer从Buffer数据中解码图像 [b]images(image[, x, y, width, height])[/b] Copy from another image从另一个图像中复制区域来创建图像 [b].fill(red, green, blue[, alpha])[/b] eg:images(200, 100).fill(0xff, 0x00, 0x00, 0.5) Fill image with color以指定颜色填充图像 [b].draw(image, x, y)[/b] Draw image on the current image position( x , y )在当前图像( x , y )上绘制 image 图像 [b].encode(type[, config])[/b] eg:images("input.png").encode("jpg", {operation:50}) Encode image to buffer, config is image setting. 以指定格式编码当前图像到Buffer，config为图片设置，目前支持设置JPG图像质量 Return buffer 返回填充好的Buffer Note:The operation will cut off the chain 注意:该操作将会切断调用链 See:.save(file[, type[, config]]) 参考:.save(file[, type[, config]]) [b].save(file[, type[, config]])[/b] eg:images("input.png").encode("output.jpg", {operation:50}) Encoding and save the current image to a file, if the type is not specified, type well be automatically determined according to the file, config is image setting. eg: { operation:50 } 编码并保存当前图像到 file ,如果type未指定,则根据 file 自动判断文件类型，config为图片设置，目前支持设置JPG图像质量 [b].size([width[, height]])[/b] Get size of the image or set the size of the image,if the height is not specified, then scaling based on the current width and height获取或者设置图像宽高，如果height未指定，则根据当前宽高等比缩放 [b].resize(width[, height])[/b] Set the size of the image,if the height is not specified, then scaling based on the current width and height 设置图像宽高，如果height未指定，则根据当前宽高等比缩放, 默认采用 bicubic 算法。 [b].width([width])[/b] Get width for the image or set width of the image获取或设置图像宽度 [b].height([height])[/b] Get height for the image or set height of the image获取或设置图像高度 [b]images.setLimit(width, height)[/b] Set the limit size of each image  设置库处理图片的大小限制,设置后对所有新的操作生效(如果超限则抛出异常) [b]images.setGCThreshold(value)[/b] Set the garbage collection threshold   设置图像处理库自动gc的阈值(当新增内存使用超过该阈值时，执行垃圾回收) [b]images.getUsedMemory()[/b] Get used memory (in bytes)得到图像处理库占用的内存大小(单位为字节) [b]images.gc()[/b] Forced call garbage collection 强制调用V8的垃圾回收机制 [url=https://github.com/zhangyuanwei/node-images]https://github.com/zhangyuanwei/node-images[/url] 以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程素材网。