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Microsoft® JScript™
for Statement
 Language Reference 
Version 1 

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Executes a block of statements for as long as a specified condition is true.
for (initialization; test; increment)

The for statement syntax has these parts:

Part Description
initialization An expression. This expression is executed only once, before the loop is executed.
test A Boolean expression. If test is true, statement is executed. If test if false, the loop is terminated.
increment An expression. The increment expression is executed at the end of every pass through the loop.
statement The statement to be executed if test is true. Can be a compound statement.

You usually use a for loop when the loop is to be executed a specific number of times. The following example demonstrates one.
/* i is set to 0 at start, and is incremented by 1 at the end 
of each iteration. Loop terminates when i is not less 
than 10 before a loop iteration. */

for (i = 0; i < 10; i++) 
  j *= i;                

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