javascript - 用多个变量计算旅程费用的总价

好的，所以我必须将用户输入的成人人数乘以我获得的旅程费用的乘积，但是我还需要考虑孩子的人数，并在所有旅程中给他们统一的20％折扣率，这是我的代码。

的HTML

<select id = "journeyList">
<option name ="Bristol " value="40">Bristol - Newcastle</option>
<option name ="London " value="35" >Bristol - London</option>
<option name ="Glasgow " value="70" >Glasgow - Manchester</option>
</select><br><br>

Number of Adults:
<form>
<input type = "number" name ="adult" id="ofAdults" value="" required><br>
Number of Children:<br>
<input type = "number" name ="child" id="ofChild" value="" required>

<button type="button" onclick="BookingFare(); return false;">Submit</button><br>
    Journey Price:
    <div id="priceBox"></div><br>
    Number of Adults:
    <div id="adultsBox"></div><br>
    Number of Children:
    <div id="childBox"></div><br>
    Total Cost:
    <div id="totalBox"></div>

Java脚本

function BookingFare() {

    var journeyList = document.getElementById("journeyList");
    var price =journeyList.options[journeyList.selectedIndex].value;
    var Adults = document.getElementById("ofAdults").value;
    var Children = document.getElementById("ofChild").value;
    //var total = price * Adults;

    document.getElementById('priceBox').innerHTML = price;
    document.getElementById('adultsBox').innerHTML = Adults;
    document.getElementById('childBox').innerHTML = Children;
    document.getElementById('totalBox').innerHTML = total;
}

我应该寻找if语句吗？谢谢您的任何建议！

最佳答案

减少20％等于乘以.8，因此：

document.getElementById('totalBox').innerHTML =
   (Adults * price) + (Children * price * .8);

关于javascript - 用多个变量计算旅程费用的总价，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/28881592/