round number 2 decimals javascript

var number = 12.3456789;
var rounded = Math.round( number * 10 ) / 10;
// rounded is 12.3

var numb = 123.23454;
numb = numb.toFixed(2);

var subTotal="12.1345";// can also be int, float, string
var subTotalFormatted=parseFloat(subTotal).toFixed(2); //"12.13"

function round(value, precision) {
    var multiplier = Math.pow(10, precision || 0);
    return Math.round(value * multiplier) / multiplier;
}

Math.round(3.14159)  // 3
Math.round(3.5)      // 4
Math.floor(3.8)      // 3
Math.ceil(3.2)       // 4

var num = 5.56789;
var n = num.toFixed(2);

myNumber.toFixed(7);

Math.round((num + Number.EPSILON) * 100) / 100

round(456.7, 2).toFixed(2) // "456.70"

round(12345.6789, -1) // 12350
round(12345.6789, -2) // 12300