Left ????
???? Variant (String)?????а?????????д??????????????????????
??
Left(string?? length)
Left ?????????????????????????

????        ???          
string        ????????????????????????????Щ??????????????? string ???? Null???????? Null??          
length        ?????????? Variant (Long)????????????????????????????????? 0??????????????? ("")????????????? string ????????????????????????        

???
??? string ???????????? Len ??????
???    LeftB ?????????????????????е????????????? length ?????????????????????????????????


Mid ????
????????з????????????????
Mid(string?? start[?? length])
????
string
??????????????з??????????? string ???? Null?????? Null??
Start
string ?б????????????????λ?á???? start ?????? string ????????????Mid ??????????????? ("")??
Length
???????????????????? length ???????????????????? start ???????????????????????д? start ??????????????????????
???
??ж? string ????????????????? Len ??????
???????????? Mid ??????????????д??????????????????????
Dim MyVar
MyVar = Mid("VB???is fun!"?? 4?? 6) ??MyVar ???? "scr??pt"??
???   MidB ?????????????????е?????????????á???????????????????????????????

Len ????
?????????????????????????洢?????????????????
Len(string | varname)
????
string
??????Ч???????????????? string ???????? Null?????? Null??
Varname
??????Ч???????????? varname ???????? Null?????? Null??
???
???????????? Len ??????????????е?????????
Dim MyString
MyString = Len("VBscr??pt") ??MyString ???? 8??
???   LenB ?????????????????е?????????????á?LenB ?????????????е????????????????????????????????????

Right ????
??????????????????????????
Right(string?? length)
????
string
?????????????????????????????? string ?????а??? Null?????? Null??
Length
?????????????????????????????? 0???????????????????????????????? string ?????е????????????????????????????
???
???? string ?????е???????????? Len ??????
???????????? Right ??????????????????????????????
Dim AnyString?? MyStr
AnyString = "Hello World"      ?? ???????????
MyStr = Right(AnyString?? 1)    ?? ???? "d"??
MyStr = Right(AnyString?? 6)    ?? ???? " World"??
MyStr = Right(AnyString?? 20)   ?? ???? "Hello World"??
???   RightB ??????????????е?????????length ????????????????????????????????????

InStr ????
?????????????????????е???γ????λ?á?
InStr([start?? ]string1?? string2[?? compare])
????
start
????????????????????????????????λ?á?????????????????????λ????????????? start ???? Null??????????????????? compare?????????? start ??????
string1
?????????????????????????
string2
??????????????????????
compare
????????????????????????????????????й???????????????á?????????????????ж????????
????
compare ?????????????????

????        ?        ????          
vbBinaryCompare        0        ??ж????????          
vbTextCompare        1        ??????????        
?????
InStr ???????????????

???        InStr ????          
string1 ?????        0          
string1 ? Null        Null          
string2 ?????        start          
string2 ? Null        Null          
string2 ??????        0          
?? string1 ????? string2        ?????????????λ??          
start > Len(string2)        0        
???
???????????? InStr ???????????
Dim SearchString?? SearchChar?? MyPos
SearchString ="XXpXXpXXPXXP"   ?? ??????????????
SearchChar = "P"   ?? Search for "P".
MyPos = Instr(4?? SearchString?? SearchChar?? 1)   ?? ??λ?? 4 ???е???????????? 6??
MyPos = Instr(1?? SearchString?? SearchChar?? 0)   ?? ??λ?? 1 ???е????????????? 9??
MyPos = Instr(SearchString?? SearchChar)   ?? ???????￡????е????????????????????????????? 9??
MyPos = Instr(1?? SearchString?? "W")   ?? ??λ?? 1 ???е????????????? 0??????? "W"????
???   InStrB ??????e???????????е????????????? InStrB ?????????????????????????????е???γ???????λ??????????λ?á?

LTrim??RTrim?? Trim ????
????????????? (LTrim)????????? (RTrim) ????????????? (Trim) ?????????????
LTrim(string)
RTrim(string)
Trim(string)
string ????????????Ч???????????????? string ?????а??? Null?????? Null??
???
???????????? LTrim?? RTrim?? ?? Trim ??????????????????????????β????? ?????β?????
Dim MyVar
MyVar = LTrim("   vbscr??pt ")   ??MyVar ???? "vbscr??pt "??
MyVar = RTrim("   vbscr??pt ")   ??MyVar ???? "   vbscr??pt"??
MyVar = Trim("   vbscr??pt ")   ??MyVar ???? "vbscr??pt"??

Rnd ????
??????????????
Rnd[(number)]
number ????????????????Ч???????????
???
Rnd ???????????С?? 1 ?????????? 0 ?????number ????????? Rnd ???????????????

??? number ?        Rnd ????          
С????        ??ζ???????????? number ????????          
??????        ?????е?????????????          
??????        ???????????          
???        ?????е?????????????        
?????????????? Rnd ??????????????е????????????????????????????????κγ??????????????????????????С?
????? Rnd ???????????????? Randomize ???????????????????????????????л?????????????????
??????????Χ???????????????????1????
Int((upperbound - lowerbound + 1) * Rnd + lowerbound)
???? upperbound ????Χ????磬?? lowerbound ????Χ?????硣
???   ??????????????У??????????????????? Randomize ???????????????????? Rnd???????? number ??? Randomize ????????????????????С?

Randomize ???
??????????????????
??
Randomize [number]
????? number ?????? Variant ???κ???Ч???????????
???
Randomize ?? number ?? Rnd ??????????????????????????????????????? number ????μ?????????????? number???????????????????????μ????????
????????? Randomize????????????Rnd ??????????ε??? Rnd ?????????????
??? ???????????????????У?????t???????????? Randomize ???????t??и???????? Rnd????t?????? number ??? Randomize ????????????????????е??
Rnd ???????
???????? Rnd ?????????????? 1 ?? 6 ???????????
??????? Randomize ?????????????????????????????????????? ???? Randomize ?? Timer ??????????????μ?????????????

Dim MyValue
Randomize   ?? ???????????????????????????

MyValue = Int((6 * Rnd) + 1)   ?? ???? 1 ?? 6 ????????????
Split????
????
????????±????????????飬???????????????????????
??
Split(expression[?? delimiter[?? count[?? compare]]])
Split??????????????????

????        ????          
expression        ????????????????????????????????? ?????expression??????????????????("")??Split????????????飬?????????????????顣          
delimiter        ???????????????????????????????????????????????????(" ")????????????delimiter????????????????????????????????????????????????? expression???????          
count        ????????????????????????1??????????е??????????          
compare        ?????????????????б??????????????????????????????????????????????        

?????
compare??????????????￡?

????        ?        ????          
vbUseCompareOption        ?1        ??Option Compare????е????????б???          
vbBinaryCompare        0        ??ж????????          
vbTextCompare        1        ??????????          
vbDatabaseCompare        2        ??????Microsoft Access?????????????????????б???        

Replace ????
??????????????????????????????????滻???????????????
Replace(expression?? find?? replacewith[?? compare[?? count[?? start]]])
????
expression
????????????????????????????????
Find
?????????????????????
Replacewith
?????????滻???????????
Start
????expression ?п???????????????λ?á????????????? 1?????count ???????????
count
???????????????滻??????????????????? -1????????????п?????滻????? start ??????????á?
Compare
????????????????????????????????????й???????????????á????????????????? 0 ??????ζ???????ж????????
????
compare ?????????????????

????        ?        ????          
vbBinaryCompare        0        ??ж????????          
vbTextCompare        1        ??????????        
?????
Replace ???????????

???        Replace ????          
expression ?????        ????????? ("")??          
expression ? Null        ????          
find ?????        expression ???????          
replacewith ?????        expression ?????????????????????? find ??????????????          
start > Len(expression)        ???????????          
count ? 0        expression ???????        
???
Replace ????????????????滻?????? start ?????λ?????? expression ????????β?????????????????????????????????β???????
???????????? Replace ???????????????
Dim MyString
MyString = Replace("XXpXXPXXp"?? "p"?? "Y")   ??????????????????????????? "XXYXXPXXY"??
MyString = Replace("XXpXXPXXp"?? "p"?? "Y"?? ?????????????????????????? "YXXYXXY"??3???? -1?? 1)

StrComp ????
??????????????????????????
StrComp(string1?? string2[?? compare])
????
string1
??????????Ч?????????????
string2
??????????Ч?????????????
Compare
????????????????????????????????????????????ж?????????й???????????????á??????
????
compare ?????????????????

????        ?        ????          
vbBinaryCompare        0        ??ж????????          
vbTextCompare        1        ??????????        
?????
StrComp ?????????·??????

???        StrComp ????          
string1 С?? string2        -1          
string1 ???? string2        0          
string1 ???? string2        1          
string1 ?? string2 ? Null        Null        
???
???????????? StrComp ??????????????????????????????????? 1 ???????????????????????? 0 ?????????ж????????
Dim MyStr1?? MyStr2?? MyComp
MyStr1 = "ABCD": MyStr2 = "abcd"   ???????????
MyComp = StrComp(MyStr1?? MyStr2?? 1)   ?? ???? 0??
MyComp = StrComp(MyStr1?? MyStr2?? 0)   ?? ???? -1??
MyComp = StrComp(MyStr2?? MyStr1)   ?? ???? 1??

CInt ????
????????????????????? Integer ??????? Variant??
CInt(expression)
expression ????????????Ч???????
???
???????????????????????????д??????????Щ??????????????????????????????????????????????磬??????????????????????????????￡???? CInt ?? CLng ??????????????
CInt ??????????д?????????????? Integer ?????????????????????????????????????????????????????????????????????á?
??? expression ?? Integer ????????????Χ???????????
???????????? CInt ??????????? Integer:
Dim MyDouble?? MyInt
MyDouble = 2345.5678      ?? MyDouble ?? Double??
MyInt = CInt(MyDouble)    ?? MyInt ???? 2346??
???   CInt ????? Fix ?? Int ????????????С?????????????????????????????С????????????? 0.5 ??? CInt ????????????????????????????????磬 0.5 ????????? 0?? ??? 1.5 ????????? 2.

CStr ????
????????????????????? String ??????? Variant??
CStr(expression)
expression ????????????Ч???????
???
???????????????????????????д??????????Щ??????????????????????????????????????????????磬??? CStr ??????????? String??
CStr ??????????? Str ?????????д?????????????? String ???????????????????????????????????????????????????????á?
expression ?????±??????????????

??? expression ?        CStr ????          
Boolean        ??????????? True ?? False??          
Date        ???????????????????????????          
Null        ?????????          
Empty        ????????? ("")??          
Error        ????????????????д?????????? Error??          
???????        ??????????????????        
???????????? CStr ?????????????? String:
Dim MyDouble?? MyString
MyDouble = 437.324         ?? MyDouble ??????????
MyString = CStr(MyDouble)  ?? MyString ???? "437.324"??

LCase ????
???????????Сд?????
LCase(string)
string ????????????Ч???????????????? string ?????а??? Null?????? Null??
???
????д????????Сд?????????Сд???????????????????

???????????? LCase ???????д???????Сд?????
Dim MyString
Dim LCaseString
MyString = "VBscr??pt"
LCaseString = LCase(MyString)   ?? LCaseString ???? "vbscr??pt"??
UCase ????
????????????д?????
UCase(string)
string ????????????Ч???????????????? string ?????а??? Null?????? Null??
???
???Сд???????????д????????д?д?????????????????????
???????????? UCase ????????????????д?????
Dim MyWord
MyWord = UCase("Hello World")   ?? ????"HELLO WORLD"??

MsgBox ????
????????????????????????????????????????????????????????
MsgBox(prompt[?? buttons][?? title][?? helpfile?? context])
????
prompt
????????????????е????????????prompt ????????? 1024 ??????????????????????????????? prompt ?а???????У?????????????????? (Chr(13))?????з? (Chr(10)) ???????з?????? (Chr(13) & Chr(10)) ?????С?
Buttons
??????????????????????????????????????????????????????????????????????????????й???????????????á??????????????? buttons ??????? 0??
Title
???????????????е?????????????????? title??????ó???????????????????С?
Helpfile
?????????????????????????????????????????????????????? helpfile????????? context???? 16 λ??????????á?
Context
?????????????????????????????????????????????????????????????? context????????? helpfile???? 16 λ??????????á?
????
buttons ?????????????????

????        ?        ????          
vbOKOnly        0        ????????????          
vbOKCancel        1        ????????????????          
vbAbortRetryIgnore        2        ?????????????????????          
vbYesNoCancel        3        ?????????????????          
vbYesNo        4        ??????????          
vbRetryCancel        5        ????????????????          
vbCritical        16        ????????????          
vbQuestion        32        ????????????          
vbExclamation        48        ?????????????          
vbInformation        64        ????????????          
vbDefaultButton1        0        ????????????????          
vbDefaultButton2        256        ????????????????          
vbDefaultButton3        512        ?????????????????          
vbDefaultButton4        768        ????????????????          
vbApplicationModal        0        ??ó??????????????????????????????????ó????й?????          
vbSystemModal        4096        ????????????????????????????ó?????????        
?????? (0 - 5) ??????????????????????????????????????? (16?? 32?? 48?? 64) ???????????????????????? (0?? 256?? 512) ??????????????????????? (0?? 4096) ?????????????????????Щ????????????? buttons ?????????????????????????????
?????
MsgBox ?????????·??????

????        ?        ???          
vbOK        1        ???          
vbCancel        2        ???          
vbAbort        3        ????          
vbRetry        4        ????          
vbIgnore        5        ????          
vbYes        6        ??          
vbNo        7        ??        
???
????????? helpfile ?? context???????????? F1 ??????????????????????????
????????????????????? ESC ???????????Ч??????????????????????????????????????????????????????????????????????????????????κ????
??MicroSoft Internet Explorer???MsgBox????????κζ???????????????"VBscr??pt"???????????????????????????
?????????????? MsgBox ???????÷???
Dim MyVar
MyVar = MsgBox ("Hello World!"?? 65?? "MsgBox Example")
   ?? MyVar ???? 1 ?? 2????????????????????????