Node裁切图片的方法

        1、安装 jimp

$ npm install --save jimp

        2、读取本地图片切图

jimp.read(&＃39;本地图片地址&＃39;, function (err, img) {if (err) throw errimg.crop(x坐标起点, y坐标起点, width最终图片宽度, height最终图片高度).write(result)
})

        3、读取http图片&＃xff0c;转成buffer&＃xff0c;切成buffer数据

const options &＃61; {headers: {&＃39;User-Agent&＃39;: &＃39;Mozilla/5.0&＃39;,}
}
http.get(imgUrl, options ,(response) &＃61;> {let imgData &＃61; &＃39;&＃39;response.setEncoding(&＃39;binary&＃39;)response.on(&＃39;data&＃39;, (chunk) &＃61;> {imgData &＃43;&＃61; chunk})response.on(&＃39;end&＃39;, () &＃61;> {const imgBuffer &＃61; new Buffer.from(imgData, &＃39;binary&＃39;)jimp.read(imgBuffer).then((img) &＃61;> {const topLeftImage &＃61; img.clone() // copy jimp对象进行操作const topRightImage &＃61; img.clone()const bottomLeftImage &＃61; img.clone()const bottomRightImage &＃61; img.clone()const topLeft &＃61; topLeftImage.crop(64, 64, 256, 256)topLeft.getBuffer(&＃39;image/jpeg&＃39;, (_, buf) &＃61;> {consoel.log(buf)})const topRight &＃61; topRightImage.crop(320, 64, 256, 256)topRight.getBuffer(&＃39;image/jpeg&＃39;, (_, buf) &＃61;> {consoel.log(buf)})const bottomLeft &＃61; bottomLeftImage.crop(64, 320, 256, 256)bottomLeft.getBuffer(&＃39;image/jpeg&＃39;, (_, buf) &＃61;> {consoel.log(buf)})const bottomRight &＃61; bottomRightImage.crop(320, 320, 256, 256)bottomRight.getBuffer(&＃39;image/jpeg&＃39;, (_, buf) &＃61;> {consoel.log(buf)})}).catch(err &＃61;> {console.error(err)})})
}).on(&＃39;error&＃39;, function (err) {console.log(&＃39;出错&＃xff01;&＃39;, err)
})


        4、graphicsMagick、imageMagick GM

        需要下载工具graphicsMagick | imageMagick并配置环境变量

$ npm i gm

/*** 裁剪图片* &＃64;param srcImg 待裁剪的图片路径* &＃64;param destImg 裁剪后的图片路径* &＃64;param width 宽度* &＃64;param height 高度* &＃64;param x x坐标* &＃64;param y y坐标*/
function cropImgHandle(srcImg, destImg, width, height, x, y) {gm(srcImg).crop(width, height, x, y).write(destImg, function (err) {if (err) {return console.log(err)} else {console.log(&＃39;success&＃39;)}})
}

        到此 Node 裁切图片的方法介绍完成。