产生两个随机数，并且两个随机数之和为固定值

产生两个随机数，并且两个随机数之和为固定值

function num(lbound, ubound) {
   return (Math.floor(Math.random() * (ubound - lbound)) + lbound);
}
   var x=num(0,24);
   var z = 24;
   var y = z - x;
 
document.write(x);
document.write("<br>");
document.write(y);