فونكشن مید فونکشن
Dingyi he Yangfa
Mid hanShu ke congsongzifuhao cuo zhi zhong fan hui zidingu shu mu de zifuhao.
Cetong:Qing shiyong Len hanShu queding zifuhao cuo zhi zhong de zifuhao shu.
Yufa
Mid(zifuhao jiaoyan,start[,length])
| Can shu | Shuomiao |
|---|---|
| string | Bixu de. Cong zheli fan hui zifuhao de zifuhao jiaoyan. Ruguo zifuhao jianhuan Null, jiang hui fan hui Null. |
| start | Bixu de. Gui ding qishuizhi. Ruguo shezhong chao yu wenzi de zifuhao shu, jiang hui fan huan kong zifuhao (""). |
| length | Xuanke de. Hui fan de zifuhao shu. Ruguo mingxie huo length chao yu wenzi de zifuhao shu (bao kuozhi start chu de zifuhao), jiang hui fan huan zifuhao cuo zhi zhong cong start dao zifuhao cuo zhi jieshu de suoyou zifuhao. |
Shili
Li an 1
dim txt txt="This is a beautiful day!" document.write(Mid(txt,1,1))
Chu Chu:
T
Li an 2
dim txt txt="This is a beautiful day!" document.write(Mid(txt,1,11))
Chu Chu:
This is a b
Li an 3
dim txt txt="This is a beautiful day!" document.write(Mid(txt,1))
Chu Chu:
This is a beautiful day!
Li an 4
dim txt txt="This is a beautiful day!" document.write(Mid(txt,10))
Chu Chu:
Zhuangai ri!
