Javascript Random Number?

Question

I have the following script:

Timer=0;
function countdown(auctionid){
    var auctions;
    var divs;

    Timer=Timer+1;

    if((Timer%10=="0")||(Timer=="1")){
        $.get("current.php", {
                id:auctionid
            },
            function(data){
                auctions=data.split("||");
                for(n=0;n<=auctions.length;n++){
                    if(auctions[n] != undefined){
                        divis=auctions[n].split("##");

                        $('#futu'+divis[0]).html(divis[1]);
                    }
                }
            }
        );
    }

    var cauctionid="auctionid";
    var tauctions=auctionid.split("|");
    for(i=0;i<=tauctions.length;i++){
        if(tauctions[i] != undefined){
            var dd=$('#futu'+tauctions[i]).text();
            var cdd=dd-1;
            $('#futu'+tauctions[i]).html(cdd);

            dd=dd*1000;
            dday=Math.floor(dd/(60*60*1000*24)*1)
            dhour=Math.floor(dd/(60*60*1000)*1)
            dmin=Math.floor((dd%(60*60*1000))/(60*1000)*1)
            dsec=Math.floor(((dd%(60*60*1000))%(60*1000))/1000*1)

            if(dday==0&&dhour==0&&dmin==0&&dsec==0){
                $('#Bid'+tauctions[i]).html("SOLD");
            //return
            }
            if(dhour <=9){
                dhour = "0"+dhour;
            }
            if(dmin <=9){
                dmin = "0"+dmin;
            }
            if(dsec <=9){
                dsec = "0"+dsec;
            }

            if(dd>=1000){
                var valll=dhour+":"+dmin+":"+dsec;
            }

            if(dd<1000){
                var valll="00:00:00";
            }

            $('#Bid'+tauctions[i]).html(valll);
        }
    }
    refreshID=setTimeout("countdown('"+auctionid+"')",1000);
}

On the line that reads: if((Timer%10=="0")||(Timer=="1")){

How do i make the 10, a random number between 2 and 12?

[***J**ust **E**njoy **T**his **H**ere!*](http://spyk3lc.blogspot.com/2016/04/javascript-get-random-number-between.html) — SpYk3HH, Apr 14 '16 at 19:04

score 49 · Accepted Answer · answered Jul 14 '09 at 22:54

49

You want to use the random() function. There is no version that returns an integer unfortunately, only a float between 0 and 1, so you'll need to do a few operations. Try the following:

var randomNum = Math.floor(Math.random() * 10) + 2;

This should generate a random integral number between 2 (inclusive) and 12 (exclusive). Change 10 to 11 if you want the 12 to be inclusive, of course.

answered Jul 14 '09 at 22:54

Noldorin

144,213
56
264
302

[***M**ore **F**un **F**ound **H**ere*](http://spyk3lc.blogspot.com/2016/04/javascript-get-random-number-between.html) – SpYk3HH Apr 14 '16 at 19:04

score 5 · Answer 2 · edited May 23 '17 at 12:01

5

See the answers to this question which also allows you to set the seed value.

edited May 23 '17 at 12:01

Community

1
1

answered Jul 14 '09 at 22:56

skamradt

15,366
2
36
53

NVRM · Answer 3 · 2018-12-04T21:30:31.983

1

Using the Web Crypto api.

console.log(

  crypto.getRandomValues(new Uint32Array(1))[0] ,

  crypto.getRandomValues(new Uint16Array(1))[0] ,
  
  crypto.getRandomValues(new Uint8Array(1))[0]
  
)

https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues https://caniuse.com/#feat=cryptography

edited Dec 04 '18 at 21:30

answered Dec 03 '18 at 20:36

NVRM

11,480
1
88
87

Javascript Random Number?

3 Answers3

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