微博圖牀

二級域名ww1-4，wx1-4

微博圖片4個等級

http://ww1.sinaimg.cn/thumbnail/005YUNMAly1ffg9igv1jdj30fk078wif.jpg
http://ww1.sinaimg.cn/small/005YUNMAly1ffg9igv1jdj30fk078wif.jpg
http://ww1.sinaimg.cn/bmiddle/005YUNMAly1ffg9igv1jdj30fk078wif.jpg
http://ww1.sinaimg.cn/large/005TzqxDgy1fg5esl35skj315o0rs41w.jpg

區分大小寫路徑

// Declaration of an enumeration.
type PictureSizes =
   | thumbnail = 0
   | small= 1
   | bmiddle= 2
   | large= 3

large
// Use of an enumeration.
let temp : PictureSizes = PictureSizes.XX

 

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