https://developer.qiniu.com/dora/api/1270/the-advanced-treatment-of-images-imagemogr2
缩略图裁剪
http://7xlcvw.com2.z0.glb.qiniucdn.com/CiviBank/201704012342071470134.jpg?imageView2/1/w/300/h/300
不降低图片质量渐进式加载
http://7xlcvw.com2.z0.glb.qiniucdn.com/CiviBank/201703231609487937215.jpg?imageMogr2/auto-orient/interlace/1
七牛官方文档链接
https://developer.qiniu.com/dora/api/1279/basic-processing-images-imageview2
https://developer.qiniu.com/dora/api/1270/the-advanced-treatment-of-images-imagemogr2
https://developer.qiniu.com/dora/api/1270/the-advanced-treatment-of-images-imagemogr2