js 数字

var numbers = [5, 458 , 120 , -215 , 228 , 400 , 122205, -85411];
var maxInNumbers = Math.max.apply(Math, numbers);
var minInNumbers = Math.min.apply(Math, numbers);
console.info(maxInNumbers+"#"+minInNumbers);

var tt = undefined;
var i = tt||100;
console.log(i)

var num =2.443242342;
num = num.toFixed(4);
console.log(num)