javascript - Why does it skips 5th alert box? -

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i tried submit without selecting radio button numbers. should alert me 7 times. however, got 6! seems skips 5th alert box. , don't know reason why. can me? thanks!

<html> <head> <style type="text/css"> h1{     width:100%;     background-color:maroon;     color:white;  }  fieldset{     width:500px;     margin:auto; }      </style> <script>   function checkanswers(){     var inputs = document.queryselectorall('input[type="radio"]');         var check = 0;         var score = 0,i=0;     for(i;i<inputs.length;i++){       var inputname = inputs[i].getattribute("name");              var checker = document.getelementsbyname(inputname);             var counter = false;             for(j=0;j<checker.length;j++){                 if(checker[j].checked == true){                     counter = true;                     += 4;                     break;                 }             }             if(counter == false){                 alert("must answer question number" + " " + inputname + "!");                 document.getelementbyid('hg-' + inputname).style.backgroundcolor = "red";                 += 4;                 check++;             }             else{                 document.getelementbyid('hg-' + inputname).style.backgroundcolor = "white";              }     }      if(check == 0){         for(i=0;i<inputs.length;i++){         var inputname = inputs[i].getattribute('name');                     var msg = document.getelementbyid('msg-' + inputname);         var store;          if(inputs[i].value == "yes" && inputs[i].checked == true){             msg.innerhtml = 'correct answer!';                         document.getelementbyid('msg-' + inputname).style.color = "green";                          document.getelementbyid('hg-' + inputname).style.backgroundcolor = "white";                           score++;            }                 else if(inputs[i].value == "no" && inputs[i].checked == true){                         msg.innerhtml = 'wrong answer!';                         document.getelementbyid('msg-' + inputname).style.color = "red";                         document.getelementbyid('hg-' + inputname).style.backgroundcolor = "yellow";                         document.getelementbyid('hg-' + inputname).style.backgroundcolor = "white";                 }      }     document.getelementbyid("score").innerhtml="your score is:" + score;   return false;     } return false;   }  </script> </head> <body> <form name="myform" onsubmit="return checkanswers()" id="form">     <center><h1>questions</h1></center>         <fieldset><br />         <div id="hg-one">         <span id="msg-one"></span>     <span>1.) simple design language intended simplify process of maing web pages presentable.</span><br /> </div><br />     <input name="one" type="radio" value="yes" /><span id="hg-one">a. css</span><br />     <input name="one" type="radio" value="no"  />b. html <br />     <input name="one" type="radio" value="no"  />c. xml <br />     <input name="one" type="radio" value="no"  />d. bootstrap <br /><br />     </fieldset>          <br /><br />         <fieldset><br />         <div id="hg-two">         <span id="msg-two"></span>         <span>2.) eiffel tower located?</span><br /></div><br />      <input name="two" type="radio" value="no"  />a. miag ao<br />     <input name="two" type="radio" value="yes"  /><span id="hg-two">b. paris</span><br />     <input name="two" type="radio" value="no"  />c. madrid<br />     <input name="two" type="radio" value="no"  />d. korea<br />    </fieldset>          <br /><br />         <fieldset><br />         <div id="hg-three">         <span id="msg-three"></span>         <span>3.) country produces proton cars?</span><br /></div><br />      <input name="three" type="radio" value="no"  />a. indonesia <br />     <input name="three" type="radio" value="yes"  /><span id="hg-three">malaysia</span><br />     <input name="three" type="radio" value="no"  />c. japan<br />     <input name="three" type="radio" value="no"  />d. south korea<br />    </fieldset>           <br /><br />         <fieldset><br />         <div id="hg-four">         <span id="msg-four"></span>         <span>4.) name of tallest structure ever built?</span><br /></div><br />      <input name="four" type="radio" value="no"  />a. grollo tower <br />     <input name="four" type="radio" value="no"  />b. cn tower<br />     <input name="four" type="radio" value="yes"  /><span id="hg-four">c. burj khalifa</span><br />     <input name="four" type="radio" value="no"  />d. taipei 101<br />    </fieldset>           <br /><br />         <fieldset><br />         <div id="hg-five">         <span id="msg-five"></span>         <span>5.) type of creature children's animated character pingu?</span><br /></div><br />      <input name="five" type="radio" value="no"  />a. porcupine <br />     <input name="five" type="radio" value="no"  />b. pony<br />     <input name="five" type="radio" value="no"  />c. pelican<br />     <input name="five" type="radio" value="yes"  /><span id="hg-five">d. penguin</span> <br />    </fieldset>          <br /><br />         <fieldset><br />         <div id="hg-six">         <span id="msg-six"></span>         <span>6.)  longest river in pakistan?</span><br /></div><br />      <input name="six" type="radio" value="no"  />a. incara <br />     <input name="six" type="radio" value="no"  />b. indeema<br />     <input name="six" type="radio" value="no"  />c. indira<br />     <input name="six" type="radio" value="yes"  /><span id="hg-six">d. indus</span> <br />    </fieldset>          <br /><br />         <fieldset><br />         <div id="hg-seven">         <span id="msg-seven"></span>         <span>6.)  longest river in pakistan?</span><br /></div><br />      <input name="seven" type="radio" value="no"  />a. incara <br />     <input name="seven" type="radio" value="no"  />b. indeema<br />     <input name="seven" type="radio" value="no"  />c. indira<br />     <input name="seven" type="radio" value="yes"  /><span id="hg-seven">d. indus</span> <br />    </fieldset>          <center><input type="submit" name='submit' value="submit"  /><br /><br />         <span id="score"></span><br /> </form>    </body> </html>

change

i += 4;

to

i += 3;

since in for(i;i<inputs.length;i++) doing i++.


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