var ary = [];
$('tr').each(function() {
    var $t               = $(this),
        id               = $t.find('td:nth-child(2)').text(),
        uid              = $t.find('td:nth-child(3)').text(),
        order_datetime   = $t.find('td:nth-child(4)').text(),
        price            = $t.find('td:nth-child(9)').text(),
        buy_user_email   = $t.find('td:nth-child(15)').text(),
        sell_user_domain = $t.find('td:nth-child(16)').text(),
        order_status     = $t.find('td:nth-child(18)').text(),
        shipped_datetime = $t.find('td:nth-child(19)').text(),
        sbi_id           = $t.find('td:nth-child(20)').text();
    ary.push('"' + id + '","' + uid + '","' + order_datetime + '","' + price + '","' + buy_user_email + '","' + sell_user_domain + '","' + order_status + '","' + shipped_datetime + '","' + sbi_id + '"' + "\n");
});
console.log(ary.join(''));