（二十三）字符串方法

函数具体使用，在QTP帮助文档中查看
一、InStr函数
功能：Returns the position of the first occurrence of one string within another.

InStr([start, ]string1, string2[, compare])

SearchString ="XXpXXpXXPXXP"   ' String to search in.
SearchChar = "P"   ' Search for "P".
MyPos = Instr(1, SearchString, SearchChar)   ' A binary comparison starting at position 1. Returns 9. 

二、Mid函数
功能：Returns a specified number of characters from a string.

Mid(string, start[, length])
注意：可选的是长度，而不是截止下标
而且从1开始计数

Dim MyVar
MyVar = Mid("VB Script is fun!", 4, 6) ' MyVar contains "Script".

用Mid函数，$168.40的值
tarstr="$168.40"
Mid(tarstr,2)

三、Len函数
功能：Returns the number of characters in a string or the number of bytes required to store a variable.

Len(string | varname)

四、Left函数
功能：Returns a specified number of characters from the left side of a string.

Left(string, length)

Dim MyString, LeftString
MyString = "VBSCript"
LeftString = Left(MyString, 3) ' LeftString contains "VBS".

五、Right函数
功能：Returns a specified number of characters from the right side of a string.

Right(string, length)

tarstr="$168.40"
用right函数，得到价格值，价格长度不固定
Right(tarstr,len(tarstr)-1)