The ASP tutorial involves the three functions of LEN (), FIX () and MID (), with the focus of the MID () function. The usage of these three functions is visible to the VBScript function manual, here is briefly introduced: len (), returns the number of characters in the string, such as Len ("WebShu) = 6; fix (), return a value of an integer Part, such as FIX (2.5) = 2, if the value is positive, fix () and int () have no difference; MID () is very common in the ASP program, returns from Nth Nth The character starts to take M characters, its format is MID ("string", n, m), such as MID ("Welcome to Webshu", 3, 2) = "Came", MID ("Welcome to Webshu ", 3, 4) =" Come to WE ", MID (" Welcome to Webshu ", 1, 4) =" Welcome ".