for - statement of language JavaScript

Repeats a group of statements a specified number of times.

for (statement1; statement2; statement3)

The for statement consists of three parts separated by semicolon:
statement1 - Specifies the initial numeric value of the variable used as cycle counter. For example:
var i=0
statement2 - Logical expression that is evaluated at the beginning of each cycle iteration. If the expression returns true, then the iteration is completed, otherwise the cycle is exited.
It is usually a simpe test whether the cycle counter is within the defined range. For example:
i < 20
statement3 - This statement is executed at the end of each iteration. It is usually an incrementation (or decrementation) of corresponding cycle variable. For example:
break statement can be used inside a loop to provide an alternate way to exit.

For similar purpose in the VBScript language is used the statement For...Next.
See also:
A simple cycle example. It dumps texts i=1 and i=2 into the Debug item of the INFO system.
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var iRow;
for (iRow = 0; iRow < 2; iRow++)
// test
Pm.Debug("iRow = " + iRow);
You can nest For...Next loops by placing one For...Next loop within another. Give each loop a unique variable name as its counter. The following construction is correct:
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var iRow, iCol, iItem;
for (iRow = 1; iRow < 3; iRow++)
for (iCol = 1; iCol < 3; iCol++)
for (iItem = 1; iItem < 3; iItem++)
// test
Pm.Debug("iRow = " + iRow + ", iCol = " + iCol + ", iItem = " + iItem);
PROMOTIC 9.0.27 SCADA system documentation MICROSYS, spol. s r.o.

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