Code to display all prime numbers not working in JavaScript?

I'm trying to display all the prime numbers up to 10 and it isn't working. Can you see what I did wrong?

function findPrimeNumbers() {
    var count = 10,
        primes = [];
    for (var i = 0; i <= count; i++) {
        if (count / i === 1 || count) primes.push(i);
        else continue;
        count -= 1;
    }
    for (var i = 0, len = primes.length; i < len; i++) return primes[i];
}

console.log(findPrimeNumber开发者_开发技巧s());

It only returns 0 in the console.

Here's about the simplest way to generate primes. Note that there are more efficient methods, but they are harder to understand.

function findPrimeNumbers (count) {
    var primes              = [];

    for (var J = 2;  J <= count;  J++) {
        var possPrime       = true;

        for (var K = 2, factorLim = Math.sqrt (J);  K <= factorLim;  K++) {
            if (J % K == 0) {
                possPrime   = false;
                break;
            }
        }
        if (possPrime)
            primes.push (J);
    }
    return primes;
}

console.log (findPrimeNumbers (10) );

This yields all the primes <= 10:

[2, 3, 5, 7]

See Wikipedia for an explanation.

for (var i = 0, len = primes.length; i < len; i++) return primes[i];

Here you are return just the first element of the array. I think you meant something like this

var retstr = "";
for (var i = 0, len = primes.length; i < len; i++)
{
    //To improve str format
    if(i == len-1)
        retstr += primes[i];
    else
        retstr += primes[i] + ", ";
}

return retstr;

Hope this helps.

if (count / i === 1 || count / i === count)

You don't say how it's not working, but the first thing that comes to my attention is that you're incrementing i, while at the same time decrementing count, so i will never get all the way to 10.

Also, count / i will cause a divide-by-zero error on the first iteration as it's written (unless Javascript magically handles that case in some way I'm not familiar with).

Then you "loop" through your return values--but you can only return once from a function, so of course you're only going to return the first value.

And you are returning from the function in the last for loop. Remove that for loop, just return the array.

function PrimeCheck(n){      //function to check prime number
 for(i=2;i<n;i++){
  if(n%i==0){
   return false
  }
}
return true;
}
 function print(x){                   //function to print prime numbers
var primeArray=[];
for(j=2;j<x;j++){
if(PrimeCheck(j)==true){             
  primeArray.push(j);
}
}
 console.log(primeArray);
}
print(10);                          //[2,3,5,7]