如何用js操作cookie

Question

here this code just stores te options and atlast it produces the result from adio buttons. i want it inted of radio button use of textbox or input field. so what should be changed?

<script language="JavaScript">
var timer,timecounter=0
function readCookie(name)
{
   var result=null;
   var myCookie=document.cookie+";";
   var searchName=name+"=";
   var start=myCookie.indexOf(searchName);
   var end;
   if(start!=-1)
    {
      start+=searchName.length;
      end=myCookie.indexOf(";",start);
      result=myCookie.substring(start,end);
    }
  return result;      
}
function writeCookie(name)
{
  var expDate=new Date();
  var day=1*24*60*60;
  expDate.setTime(expDate.getTime()+day);
  document.cookie=name+"="+timecounter;
}
function starttimer(counter,ans)
{
var cook 
    timecounter=parseInt(readCookie(<%=chr(34) & examname&"totaltime"& chr(34)%> ))
   var index=-1
   if(ans=="A")
        index=0
   else if(ans=="B")
        index=1      
   else if(ans=="C")
        index=2      
   else if(ans=="D")
        index=3

   if(document.examform.qno.value-1<=counter&&index!=-1)
        document.examform.elements[index].checked=true
      timer=setInterval("change()",1000)

}
function stoptimer()
{
    writeCookie("<%=examname&"totaltime"%>");  
    clearInterval(timer)
}
function change()
{
    var hrs,mins,secs;
    hrs=parseInt(timecounter/3600);
    mins=parseInt(timecounter/60);
    secs=timecounter%60;
    window.status="Time Remaining : "+hrs+":"+mins+":"+secs;
    rem_time.innerText="Time Remaining :"+hrs+":"+mins+":"+secs;
    timecounter--
    if(timecounter==-1)
      {
        store_ans()
        stoptimer()
        document.examform.submit()    

      }           
}
function store_ans()
{
     var elems=document.examform.elements 
     var ans=""
    for(var i=0;i<elems.length;i++)
     if((elems[i].type=="radio"||elems[i].type=="checkbox")&&elems[i].checked)
         ans=ans+elems[i].value    
    document.examform.answer.value=ans
    if(ans=="")
      document.examform.answer.value="Not Attempted"    
    stoptimer()
}       
</script>

Answer 1

document.cookie : get and set the cookies associated with the current document (Mozilla Developer Network)

You can manipulate cookies with vanilla JavaScript using the document.cookie global.

To store multiple cookies, you have to assign document.cookie multiple times, eg to store var a = '1'; var b = '2' var a = '1'; var b = '2' you do

document.cookie = "a=1";
document.cookie = "b=2";

To read the cookie string, simply reference document.cookie , eg console.log(document.cookie)

Also, your post has several editing and grammatical mistakes. Additionally, this is a question which can be easily answered with a Google search.