1，安首先要安装 GraphicsMagick或者ImageMagick

2，npm install gm   --save

3，编码测试

var fs = require('fs')
//graphMagick
const gm = require('gm');
//imageMagick
//const gm = require('gm').subClass({imageMagick: true});

// resize and remove EXIF profile data
gm('./20191012105220251.jpg')
.resize()
.noProfile()   //清除图片信息
.quality(70)   //图像质量
.autoOrient() //自动旋转
//.crop(800,200,100,100)//裁剪参数(w,h,x,y)

.write('./resize.jpg', function (err) {
  if (!err) console.log('done');
});