javascript - need a solution to increase decrease font size on website -


i trying add option on 1 of website user can change font size. , found video on youtube (https://www.youtube.com/watch?v=mogbw3wkecc). don't know why script not working.

here codes:

<!doctype html> <html> <head>     <title></title>     <script type="text/javascript">         $(document).ready(function() {              $('#fontincrease').click(function() {                 modifyfontsize('increase');             });             $('#fontdecrease').click(function() {                 modifyfontsize('decrease');             });             $('#fontreset').click(function() {                 modifyfontsize('reset');             });              function modifyfontsize(flag) {                 var divelement = $('#entrypbody');                 var currentfontsize = parseint(divelement.css('font-size'));                  if (flag =='increase') {                     currentfontsize +=2;                 }; else if (flag ='decrease') {                     currentfontsize -=2;                 }; else currentfontsize = 15;                  divelement.css('font-size', currentfontsize);             }         });     </script>     <style type="text/css">         .paragraph {             font-size: 15px;         }     </style> </head> <body> <div>     font size: <a id="fontincrease" href="#">increase</a> <a id="fontdecrease" href="#">decrease</a> <a id="fontreset" href="#">reset</a> </div> <div id="entrypbody" class="paragraph" >     <ul>         <li>unorderd list 1</li>         <li>unorderd list 2</li>         <li>unorderd list 3</li>         <li>unorderd list 4</li>     </ul> </div> </body> </html>

can 1 me out of problem??

there semi-colons in if statement. here way :

if (flag == 'increase') {     currentfontsize +=2; } else if (flag == 'decrease') {     currentfontsize -=2; } else {     currentfontsize = 15; }

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