javascript - Extreamly simple HTML js code,but why doesn`t it work? -

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i trying learn make simple quiz.so got script in stackoverflow.it works here http://jsfiddle.net/zy4gw/ ,but not when use ,here code

<html> <head> <title>learning how make quiz</title> <script type="text/javascript">  $(function(){  $('#q-and-a li a').each(function(){   $(this).click(function(){       $(this).siblings('div').slidetoggle(300);               });         });                  }); </script> </head>  <body>  <ul id="q-and-a">     <li><a>question one</a>     <div>answer question one...</div>   </li>      <li><a>question two</a>      <div>answer question two...</div>   </li> </ul>  <style>     ul { margin: 0; padding: 0; }     ul li { margin: 0; padding: 0; list-style: none; }     ul li { color: blue; }     ul li div { display: none; } </style>   </body> </html>

why doesn`t run?

<!doctype html>  <html> <head> <title>learning how make quiz</title> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>                                    //you had not imported library required running jquery <script type="text/javascript">  $(document).ready((function(){                   $('#q-and-a li a').click(function(e){                $(this).next('div').slidetoggle(300);        //div child of li not sibling            });        }));       </script> </head>  <body>  <ul id="q-and-a">     <li><a >question one</a>     <div>answer question one...</div>   </li>      <li><a >question two</a>      <div>answer question two...</div>   </li> </ul>  <style>     ul { margin: 0; padding: 0; }     ul li { margin: 0; padding: 0; list-style: none; }     ul li { color: blue; }     ul li div { display: none; } </style>   </body> </html>

your mistakes follows: 1) had not imported library required jquery 2) function using access div element div child element of li. accessing sibling of li.
3) no need of .each function access li separately


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