var 100 var 200 var 300 ---------- var max var min if max max if min m

var a = 100;
var b = 200;
var c = 300;

//----------
var max = a;
var min = a;

if (max < b) {
	max = b;
}
if (min > b) {
	min = b;
}
if (max < c) {
	max = c;
}
if (min > c) {
	min = c;
}