VBScript learning notes-Key Points of basic syntax (1)

(1) Operators

1. The + operator can be used to connect strings.

Fullname = firstname + "" + lastname

However, we recommend that you use the & operator & dedicated to string connection.

Fullname = firstname & "& lastname

2. arithmetic operators:

^ Power

/Division

\ Division

MoD Division

3. Comparison operators:

= Equal to 'vb, the "Equal" operator of the logical operation and the value assignment use the same operator

<> Not equal

Is object equal

4. logical operators:

Not Inverse

And logic and

Or logic or

XOR exclusive or (different)

Eqv equality (Same) False eqv false = true

IMP contains (the same value or the second value is true)

(2) automatic type conversion

Number +/-string (string) if the string represents a number, convert it to a number and the result is also a number. Otherwise, an error is returned.

Date/time +/-the integer part of the number is used as the sum of the number of days and the date. The fractional part is used as the sum of the Time Offset and the number of days,

As a decimal part of a day (1 S = 0.0000115741; 12 h = 0.5)

Date +/-string if a string represents a number, it is converted to a number and the result is a date. Otherwise, an error is returned.

Convert values of any type to strings of any type and connect strings

(3) Process Control

1. If... then statement

IfConditionThen

...

ElseifOtherconditionThen

...

Else

...

End if

2. Select case statement

Select caseVariable

CaseValue: Statements

CaseValue:

Statements

...

End select

'Value can be a variable. When variable meets multiple values, only the first matching case statement is executed.

3. Do WHILE LOOP

1) do whileCondition

Statements

Loop

2) DoCondition

Statements

Loop

3) do

Statements

Loop whileCondition

4) do

Statements

LoopCondition

5) 'end from inside the loop

'Use the exit do statement

Do

Statements

IfConditionThen exit do

Statements

Loop

While form (1), 3): loop when condition is true;

Until form (2), 4): loop when condition is fasle;

Do first (3), 4): execute a statement at least once regardless of the condition.

4. For... next statement count

1)Counter=StartvalueToEndvalue

Statements

...

Next

2)Counter=StartvalueToEndvalueStepStepvalue

Statements

...

Next

'StepvalueIt can be a negative value.

5. Use for each to process collections and Arrays

Collection variable type: A list of file names, user names, or other data contained in a single variable.

The difference between a set and an array (from the http://blog.sina.com.cn/s/blog_5b7bfe100100mt2t.html ):

The set can be expanded as needed, unlike the array size. You can insert or delete an element into or from a collection. The collection can be automatically processed.

Except for arrays of the variant type, Arrays can only store the data types specified during declaration. However, different types of data can be stored in the same set.

Although you do not know the position of the element, you can quickly access the elements in the set through the subject word, or you can read the element value by the element serial number in the array method, which is flexible.

The modification of the Set element is not as convenient as that of the array element. You must delete it before adding it.

Processing a set is much slower than processing an array.

1) set FSO = Createobject ("scripting. FileSystemObject ")

Set tempfiles = FSO. getfolder ("C: \ Temp"). Files

Filelist = ""

For each file in tempfiles

Filelist = filelist & "," & file. Name

Next

Msgbox "the temp files are:" & filelist

2) dim Names [10]

...

For each NM in names

...

Next

VBScript learning notes-Key Points of basic syntax (1)