math - Why does my JavaScript Prime Number-Generator not work? -

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the aim of program list prime numbers 1 up. complete novice. began writing in c++ (unsuccessfully) , translated (js) aware of problems don't know how solve them: handling global variables, writing replaces, no timeout before writing, etc. important use external js file? in summary, how make work?

<!doctype html> <html> <head> <script>  var number = 3; //to run through prime test var prime = [2]; //numbers found prime var found = 1; //counter primes found var runs = 0; //counter times number has been tested //numbers tested against smaller found primes function test() {     window.scroll(0,document.height); //automatically view latest prime     var line = document.createelement("div");     while(runs < found && (prime[runs] < (number / 2))) //has number passed tests     {         if(number % prime[runs] !== 0) //is number divisible smaller prime         {             runs = runs + 1; //number passed test         }         else //number not prime         {             number = number + 1; //next number generated             runs = 0; //reset test counter next number             settimeout(test, 100); //start running next number tests         }     } //number passed tests line.innerhtml = number; //prime number displayed document.body.appendchild(line); prime[found] = number; //prime number saved testing found = found + 1; //counter found increased number = number + 1; //next number generated runs = 0; //reset test counter next number settimeout(test, 100); //start running next number tests }  </script> </head> <body> <form>     <input type="button" onclick="test()"> </form> </body> </html>

on mathematical side,

var prime = [1];

1 isn't prime, , since 1 divides every number,

while (runs < found) //has number passed tests {     if (number % prime[runs] !== 0) //is number divisible smaller prime     {         runs = runs + 1; //number passed test     }     else //number failed test     {         number = number + 1; //next number generated         runs = 0; //reset test counter next number         settimeout(test, 1000); //start running next number tests     } } //number passed tests

always enters else branch runs = 0.

you can start var prime = [2]; or var prime = []; , var found = 0;.


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