Brief tutorial of vbs script syntax (1)

1、Hello World！ Represents a script
   msgbox "Hello World!"
   Msgbox grammar ：msgbox  " Content ", , " title "

2、 Input output interaction
    Dim name
    name= Inputbox(" Please enter your name :"," name ")
    Inputbox(" Dialog content "," Dialog title ")
    Msgbox  name, , " What's your name "

3、 Variable definition and use
    Vbs There is only one variable type , The system will automatically distinguish the variable type , And case insensitive .
     Dim name,name2,............   

     Dim value

    One 、 It is allowed to assign two variables simultaneously in one line of code , Separated by colons in the middle .
    Two 、、 You can use Option Explicit To tell the host that variables must be declared before being used .
    3、 ... and 、、 Variable runtime type conversion .
            Cbool Function converts a variable to a Boolean value ;
            Cbyte The function converts a variable to 0 To 255 Integer between .
            Ccur function 、Cdbl Functions and Csng Function converts a variable to a floating-point number , Ccur To four decimal places , The latter two are more accurate
            Cdate Function converts a variable to a date value .
            Cint Functions and Clng Function converts a variable to an integer , The scope of the latter is larger .
            Cstr Function converts a variable to a string .

      Four 、 Array
The subscript of an array always starts from 0 Start , Value minus one ends .
               
               DIM array（9）    // Define an array with ten data
               value = array(4)    // Access the fifth element
               // Declare a dynamic array without specifying the number and dimension of the array .
               // Use keywords redim To change the array .
               // Be careful , When changing the size of the array , The data of the array will be destroyed , Use keywords preserve To protect data . for example ：
              RedIm Space preserve Space array Number of brackets comma dimension brackets

4、 The operator
      operation ：   +,-,*,/, ^( chengfang )  , Mod( modulus )
      Compare ：   ＝   >    <   >=   <=   <> It's not equal to
      Logic ：   AND  NOT   OR
      Connection string ：
                 +   or  &   ( In general use & The operator )
      Comparison object ：Is

5、 Conditional statements
   －－－－－－－－－－－－－－－－－－－－－
    if   Conditions  then
         ......
         ......
    else if   Conditions  then
         ......
         ......
    endif
    －－－－－－－－－－－－－－－－－－－－－
    Select  case   Variable
    Case   Conditional value
           .......
    Case   Conditional value

           .......

    case  else
           .......
    nd  select
    －－－－－－－－－－－－－－－－－－－－－

6、 Loop control statement
   for……next loop
   for……each loop
   do……while loop
   do……until loop
   while loop
   _____________________________________________________________________
    Fixed number of times
    For   Counter variables ＝ Start counting  to   Last count
        Execution loop body
    Next
    _____________________________________________________________________

      Array or object collection traversal

    For  each   Loop count variable  in   Object or array to view

        Execute processing statements
    Next

    Be careful ： It can be used at any time in the above two cycles exit  for To exit the loop
    _____________________________________________________________________
      Execute the loop when the conditions are met
    Do  while   Conditions
        Execution loop body
    Loop

    While   Conditions
        Execution loop body
    Wend
  _____________________________________________________________________
      Execute the loop when the conditions are met

    Do　until　 Conditions
        Execution loop body
    Loop

    Be careful ： The above can be used exit  do To exit the loop

7、 ... and 、 Use two processes
    One is a function , Return value to caller
    One is subroutine , No return value , There is also a special subroutine called event , Use less .

    function
    ————————————————————————－－－－－
    Function   The name of the function （ parameter list ）
    function code
    The name of the function ＝ Certain value ‘ Used to return the value
    end  function

      Subroutines
    ————————————————————————－－－－－
    sub   The name of the function （ parameter list ）
    function code
    end  sub

    Be careful ： When calling subroutines , The parameter list is not bracketed , Parentheses are only used in functions . in addition , Subroutines cannot be used in expressions .  The function can only appear on the right side of the assignment statement , In the expression , Functions cannot be used directly , If you have to use functions directly , Must be used call The statement calls , And cancel the return value .