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Instead of adding several almost equal lines in a script we can use loops to perform a task like this. In JavaScript there are two different kind of loops: for - loops through a block of code a specified number of times. while - loops through a block of code while a specified condition is true.
<html> <body> <script type=text/javascript> for (i = 1; i <= 6; i++) { document.write(<h + i + >This is header  + i) document.write(</h + i + >) } </script> </body> </html>. The while loop is used when you want the loop to execute and continue executing while the specified condition is true.