Bing wallpaper api

list:

http://www.bing.com/HPImageArchive.aspx?format=js&idx=0&n=1&mkt＝zh-cn

idx:-1为明天，1为昨天，2为后天，依次类推，已知可选项-1 ~ 18，默认为0 start

n：个数

mkt:地区"en-US", "zh-CN", "ja-JP", "en-AU", "de-DE", "en-NZ", "en-CA"

getImageURL:

resolution:640x480,800x600,1024x768,1280x720,1920x1080,800x480,1366x768,1920x1200,1280x768

http://www.bing.com/{imageBaseUrl}+"_"+"{resolution}"+"jpg";