找了半天，就是出不来，帮忙看看各位

var cartTable = document.getElementById('cartTable');

//.rows,专门获取tr

var tr = cartTable.children[1].rows;

    var checkInputs = document.getElementsByClassName('check');

    var checkAllInputs = document.getElementsByClassName('check-all');

    var selectedTotal = document.getElementById('selectedTotal');

    var priceTotal = document.getElementById('priceTotal');

//计算

function getTotal() {

        var seleted = 0;

        var price = 0;

        for (var i = 0, len = tr.length; i < len; i++) {

            if (tr[i].getElementsByTagName('input')[0].checked) {

                seleted += parseInt(tr[i].getElementsByTagName('input')[1].value);

                price += parseFloat(tr[i].cells[4].innerHTML);

            }

        }

        selectedTotal.innerHTML = seleted;

        priceTotal.innerHTML = price.toFixed(2);

    }

for (var i = 0 , len = checkInputs.length; i < len; i++) {

        checkInputs[i].onclick = function () {

getToal();

}

}

}