javascript - round to 2 decimal places in js invoice -

i have invoice js script done , working, cant figure out how round grand total 2 decimal spaces.

js:

var item = document.getelementbyid('item'); var item1 = document.getelementbyid('item1'); var item2 = document.getelementbyid('item2'); var item3 = document.getelementbyid('item3');  item.onchange = function() {         price.innerhtml = "$" + this.value;         qty.value = 1; //order 1 default.         add();     };     qty.onchange = function() {         add();     } item1.onchange = function() {         price1.innerhtml = "$" + this.value;         qty1.value = 1; //order 1 default.         add();     };     qty1.onchange = function() {         add();     } item2.onchange = function() {         price2.innerhtml = "$" + this.value;         qty2.value = 1; //order 1 default.         add();     };     qty2.onchange = function() {         add();     } item3.onchange = function () {         price3.innerhtml = "$" + this.value;         qty3.value = 1; //order 1 default.         add();     };     qty3.onchange = function() {         add();     }   function add() {       var inputs = document.getelementsbytagname('input');       var selects = document.getelementsbytagname('select');        var total = 0;       (var = 0; < selects.length; i++) {         var sum = 0;         var price = (parsefloat(selects[i].value) )?parsefloat(selects[i].value):0;         var qty = (parsefloat(inputs[i].value) )?parsefloat(inputs[i].value):0;         sum += price * qty;         total += sum * 1.06         if(i == 0){           document.getelementbyid('result').innerhtml = "$" + sum;         }else{            document.getelementbyid('result'+i).innerhtml = "$" + sum;         }                    };        document.getelementbyid('total').innerhtml = "$" + total;   } 

ive tried 3 or 4 methods, due lack of experience js, cant right

use:

.tofixed(2); 

on grand total

like:

1.23898.tofixed(2); // 1.24