I am trying to calculate the random numbers roll of the dice in a loop till a double is rolled. Nothing happening when I load the page

I am trying to calculate the random numbers roll of the dice in a loop till a double is rolled. Nothing happening when I load the page. Here is my code.

 var roll1 = randomInteger(1,6);
 var roll2 = randomInteger(1,6);
 while(roll1 != roll2){ 
    var roll1 = randomInteger(1,6);
    var roll2 = randomInteger(1,6);

    document.write(+roll1+ " - " +roll2+ );

}
document.write("<br><br><b>Doubles obtained" );