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for Statement 

Executes a block of statements for as long as a specified condition is true.


for (initialization; test; increment)
...statement

initialization

Required. An expression. This expression is executed only once, before the loop is executed.

test

Required. A Boolean expression. If test is true, statement is executed. If test if false, the loop is terminated.

increment

Required. An expression. The increment expression is executed at the end of every pass through the loop.

statement

Optional. 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 known number of times.

The following example demonstrates a for loop.

/* 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. */
var myarray = new Array();
for (var i = 0; i < 10; i++) {
   myarray[i] = i;
}
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