JS gets the random number function to customize the minimum maximum

 
 
function selectFrom(lowerValue, upperValue){ 

//Total value range
var choices = upperValue - lowerValue + 1; 
return Math.floor(Math.random() * choices + lowerValue); 
} 
var num = selectFrom(2, 10); 
alert(num);//A value between 2 and 10 (including 2 and 10)

var colors = ["red","green","blue","yellow","black","brown"]; 
var color = colors[selectFrom(0, colors.length-1)]; 
alert(color);//It could be any value in the array