javascript - I want to count how many questions are attended by user -

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i want count how many question user attended. if user click 1 options 1 question want increment 1 value. ex: if user attend 7/10 count 7.

<div id="ques1" class="showquestion">     <div class="ques">         <p>questions ////////////</p>     </div>     <div>         a)         <input id="op-1-0" name="answers19" value="2918" type="radio" />     </div>     <div>         b)         <input id="op-1-1" name="answers19" value="2919" type="radio" />     </div>     <div>         c)         <input id="op-1-2" name="answers19" value="2920" type="radio" />     </div>     <div>         b)         <input id="op-1-3" name="answers19" value="2921" type="radio" />     </div> </div> <div id="ques2" class="showquestion">     <div class="ques">         <p>questions ////////////</p>     </div>     <div>         a)         <input id="op-1-0" name="answers19" value="2918" type="radio" />     </div>     <div>         b)         <input id="op-1-1" name="answers19" value="2919" type="radio" />     </div>     <div>         c)         <input id="op-1-2" name="answers19" value="2920" type="radio" />     </div>     <div>         b)         <input id="op-1-3" name="answers19" value="2921" type="radio" />     </div> </div> <div class="button-group">     <input value="previous" type="button" />     <input value="next" type="button" /> </div> <br/> <div id="count"></div>

here answer: (jquery)

  var total = $(':radio:checked').length;

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