函数接收来自另一个更新输入的函数的变量的问题

Question

http://jsfiddle.net/sSwvq/94/

标题大部分说，我遇到了最后一个函数的问题，它从函数b接收变量，函数b从函数a接收变量，函数a基于用户每次更改输入时都有效。

发送数据的方式是

input.functionA发送变量1并运行函数b

input.functionA发送变量2并运行函数b

input.functionA发送变量3并运行函数b

functionB（1）发送变量4并运行函数c

functionB（2）发送变量5并运行函数c

functionB（3）发送变量6并运行函数c

functionC（4,5,6）一次接收一个变量（我认为这是问题，因为它的运行没有收集所有变量）并运行该函数。

非常感谢任何帮助！代码如下！ HTML

<form>
<input id="wineQty" class="qty" type="text" placeholder="Wine Tasting Amount" />
<input id="dinnerQty" class="qty" type="text" placeholder="Dinner Amount" />
<input id="golfTeamQty" class="qty" type="text" placeholder="Golf Team Amount" />
</form>

<!--display total cost here--> 
The Costs are: <br>
Wine Tasting: <span id="wineCostTag"> </span> <br>
Dinner: <span id="dinnerCostTag"> </span> <br>
Golf Team: <span id="golfCostTag"> </span> <br>
Total Cost: <span id="orderTotalCost"> </span>

的Javascript

var wineCost = 20;
var wineQuantity = document.getElementById("wineQty");

var dinnerCost = 30;
var dinnerQuantity = document.getElementById("dinnerQty");

var golfTeamCost = 400;
var golfTeamQuantity = document.getElementById("golfTeamQty");

var wineCostTag = document.getElementById("wineCostTag");
var dinnerCostTag = document.getElementById("dinnerCostTag");
var golfCostTag = document.getElementById("golfCostTag");
var orderTotalCost = document.getElementById("orderTotalCost");

wineQuantity.oninput =  function(){
    var val1 = parseInt(wineQuantity.value, 10);
    updateWine(val1);
};

dinnerQuantity.oninput =  function(){
    var val2 = parseInt(dinnerQuantity.value, 10);
    updateDinner(val2);
};

golfTeamQuantity.oninput =  function(){
    var val3 = parseInt(golfTeamQuantity.value, 10);
    updateGolf(val3);
};

function updateWine(val1) {
    var wineTotalCost = (wineCost * val1);
    wineCostTag.innerHTML = wineTotalCost;
    updateTotal(wineTotalCost);
}

function updateDinner(val2) {
    var dinnerTotalCost = (30 * val2);
    dinnerCostTag.innerHTML = dinnerTotalCost;
    updateTotal(dinnerTotalCost);
}

function updateGolf(val3) {
    var golfTeamTotalCost = (400 * val3);
    golfCostTag.innerHTML = golfTeamTotalCost;
    updateTotal(golfTeamTotalCost);
}


function updateTotal(wineTotalCost, dinnerTotalCost, golfTeamTotalCost) {
    var totalCost = (wineTotalCost + dinnerTotalCost + golfTeamTotalCost);
    orderTotalCost.innerHTML = totalCost
}