A simple program asks the user to give a string and then the program will reverse the given string and display the reverse string in the alert dialog box using JavaScript programming language.

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Program Listing

<html>
<h2>Reverse a String in JavaScript</h2>
<style>
  body {
  	font-family: arial;
  }
</style>
<script type="text/javascript">
function reverse_string(form) {
var text = "";
var str = document.getElementById( 'rev_string' ).value;
for (i = 0; i <= str.length; i++)
text = str.substring(i, i+1) + text;
alert( "" + text);
}
</script>
<form>
<input type="text" size=40 id="rev_string"><br><br>
<input type="button" value="Reverse String" onClick="reverse_string(rev_string)">
</form>
</html>

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