MID函数

　　语法

　　VB中Mid(String As Variant, Start As Long, [Length As Variant]) As VariantMid$(String As String, Start As Long, [Length As Variant]) As String

　　Excel中MID(text, start_num, num_chars)

　　说明这个函数的3个参数各在VB和Excel中互相等价，但VB中的Length参数可以省略，而Excel中num_chars参数不可省略。