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原生JS实现简单的汇率转换问题

程序员文章站 2022-06-27 20:24:56
html代码 css代码 JavaScript代码 javascript // 获取货币1对象 let currencyEl_one = document.getElementById("currency one"); // 获取货币2对象 let currencyEl_two = document ......

html代码

<!doctype html>

<html lang="en">

<head>

    <meta charset="utf-8" />

    <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta http-equiv="x-ua-compatible" content="ie=edge" /> <title>exchange rate calculator</title>

    <link rel="stylesheet" href="style.css" />

</head>

<body>

<img src="money.png" alt="" class="money-img" />

<h1>exchange rate calculator</h1>

<p>choose the currency and the amounts to get the exchange rate</p>

<div class="container">

    <div class="currency">

        <select id="currency-one">

            <option value="aed">aed</option>

            <option value="ars">ars</option>

            <option value="aud">aud</option>

            <option value="bgn">bgn</option>

            <option value="brl">brl</option>

            <option value="bsd">bsd</option>

            <option value="cad">cad</option>

            <option value="chf">chf</option>

            <option value="clp">clp</option>

            <option value="cny">cny</option>

            <option value="cop">cop</option>

            <option value="czk">czk</option>

            <option value="dkk">dkk</option>

            <option value="dop">dop</option>

            <option value="egp">egp</option>

            <option value="eur">eur</option>

            <option value="fjd">fjd</option>

            <option value="gbp">gbp</option>

            <option value="gtq">gtq</option>

            <option value="hkd">hkd</option>

            <option value="hrk">hrk</option>

            <option value="huf">huf</option>

            <option value="idr">idr</option>

            <option value="ils">ils</option>

            <option value="inr">inr</option>

            <option value="isk">isk</option>

            <option value="jpy">jpy</option>

            <option value="krw">krw</option>

            <option value="kzt">kzt</option>

            <option value="mxn">mxn</option>

            <option value="myr">myr</option>

            <option value="nok">nok</option>

            <option value="nzd">nzd</option>

            <option value="pab">pab</option>

            <option value="pen">pen</option>

            <option value="php">php</option>

            <option value="pkr">pkr</option>

            <option value="pln">pln</option>

            <option value="pyg">pyg</option>

            <option value="ron">ron</option>

            <option value="rub">rub</option>

            <option value="sar">sar</option>

            <option value="sek">sek</option>

            <option value="sgd">sgd</option>

            <option value="thb">thb</option>

            <option value="try">try</option>

            <option value="twd">twd</option>

            <option value="uah">uah</option>

            <option value="usd" selected>usd</option>

            <option value="uyu">uyu</option>

            <option value="vnd">vnd</option>

            <option value="zar">zar</option>

        </select>

        <input type="number" id="amount-one" placeholder="0" value="1" />



    </div>

    <div class="swap-rate-container">

        <button class="btn" id="swap">

            swap

        </button>

        <div class="rate" id="rate"></div>

    </div>

    <div class="currency">

        <select id="currency-two">

            <option value="aed">aed</option>

            <option value="ars">ars</option>

            <option value="aud">aud</option>

            <option value="bgn">bgn</option>

            <option value="brl">brl</option>

            <option value="bsd">bsd</option>

            <option value="cad">cad</option>

            <option value="chf">chf</option>

            <option value="clp">clp</option>

            <option value="cny">cny</option>

            <option value="cop">cop</option>

            <option value="czk">czk</option>

            <option value="dkk">dkk</option>

            <option value="dop">dop</option>

            <option value="egp">egp</option>

            <option value="eur" selected>eur</option>

            <option value="fjd">fjd</option>

            <option value="gbp">gbp</option>

            <option value="gtq">gtq</option>

            <option value="hkd">hkd</option>

            <option value="hrk">hrk</option>

            <option value="huf">huf</option>

            <option value="idr">idr</option>

            <option value="ils">ils</option>

            <option value="inr">inr</option>

            <option value="isk">isk</option>

            <option value="jpy">jpy</option>

            <option value="krw">krw</option>

            <option value="kzt">kzt</option>

            <option value="mxn">mxn</option>

            <option value="myr">myr</option>

            <option value="nok">nok</option>

            <option value="nzd">nzd</option>


            <option value="pab">pab</option>

            <option value="pen">pen</option>

            <option value="php">php</option>

            <option value="pkr">pkr</option>

            <option value="pln">pln</option>

            <option value="pyg">pyg</option>

            <option value="ron">ron</option>

            <option value="rub">rub</option>

            <option value="sar">sar</option>

            <option value="sek">sek</option>

            <option value="sgd">sgd</option>

            <option value="thb">thb</option>

            <option value="try">try</option>

            <option value="twd">twd</option>

            <option value="uah">uah</option>

            <option value="usd">usd</option>

            <option value="uyu">uyu</option>

            <option value="vnd">vnd</option>

            <option value="zar">zar</option>

        </select>

        <input type="number" id="amount-two" placeholder="0" /> </div>

</div>

<script src="script.js"></script>

</body>

</html>

css代码

:root {

    --primary-color: #5fbaa7;

}

*	{

    box-sizing: border-box;

}

body {

    background-color: #f4f4f4;

    font-family: arial, helvetica, sans-serif;

    display: flex;

    flex-direction: column;

    align-items: center;

    justify-content: center;
    height: 100vh;

    margin: 0;

    padding: 20px;

}

h1 {

    color: var(--primary-color);

}

p	{

    text-align: center;

}

.btn {

    color: #fff;

    background: var(--primary-color);

    cursor: pointer;

    border-radius: 5px;

    font-size: 12px;

    padding: 5px 12px;

}

.money-img {

    width: 150px;

}

.currency {

    padding: 40px 0;

    display: flex;

    align-items: center;

    justify-content: space-between;

}

.currency select {

    padding: 10px 20px 10px 10px;

    -moz-appearance: none;

    -webkit-appearance: none;

    appearance: none;

    border: 1px solid #dedede;

    font-size: 16px;

    background: transparent;

    background-image: url('data:image/svg+xml;charset=us-ascii,%3csvg%20xmlns%3d%22http%3a%2f%2fwww.w3.org%2f2000%2fsvg%22%20width%3d%2229 2.4%22%20height%3d%22292.4%22%3e%3cpath%20fill%3d%22%20000002%22%20d%3d%22m287%2069.4a17.6%2017.6%200%200%200-13-5.4h18.4c-5%200-9.3%201.8-12.9%205.4a17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4l287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2f%3e%3c%2fsvg%3e');

    background-position: right 10px top 50%, 0, 0;

    background-size: 12px auto, 100%;

    background-repeat: no-repeat;

    }

    .currency input {

    border: 0;

    background: transparent;

    font-size: 30px;

    text-align: right;

    }

    .swap-rate-container {

    display: flex;

    align-items: center;

    justify-content: space-between;

    }

    .rate {

    color: var(--primary-color);

    font-size: 14px;

    padding: 0 10px;

}

select:focus,

input:focus,

button:focus {

    outline: 0;

}

@media (max-width: 600px) {

    .currency input {

        width: 200px;

    }

}

javascript代码

// 获取货币1对象
let currencyel_one = document.getelementbyid("currency-one");
// 获取货币2对象
let currencyel_two = document.getelementbyid("currency-two");
// 获取货币1对应的汇率对象
let amountel_one = document.getelementbyid("amount-one");
// 获取货币2对应的汇率对象
let amountel_two = document.getelementbyid("amount-two");
// 获取提示框对应的对象
let rateel = document.getelementbyid("rate");

// 检查初始状态下 是否需要换算汇率
getdata();

// 货币2发生变化时 触发的事件
currencyel_two.onchange = getdata;

// 货币1发生变化时 触发的事件
currencyel_one.onchange = getdata;

// 获取按钮 货币1和货币2是否都有值
let btn = document.getelementbyid("swap");

// 点击交换按钮时 触发的事件
btn.onclick = function() {
    // console.log("!!!");
    let currency_one = currencyel_one.value;
    let currency_two = currencyel_two.value;
    // 定义临时变量
    let temp = currency_one;
    // 交换货币1和货币2的value
    currencyel_one.value = currency_two;
    currencyel_two.value = temp;
    // 并且交换货币1和货币2对应的汇率
    currency_one = currency_two;
    currency_two = temp;

    fetch(`https://api.exchangerate-api.com/v4/latest/${currency_one}`)
        .then(res => res.json())
        .then(data => {
            const rate = data.rates[currency_two];
            rateel.innertext = `1 ${currency_one} = ${rate} ${currency_two}`;
            amountel_two.value = (amountel_one.value * rate).tofixed(2);
        });

};

// 得到汇率
function getdata() {
        let currency_one = currencyel_one.value;
        let currency_two = currencyel_two.value;
        fetch(`https://api.exchangerate-api.com/v4/latest/${currency_one}`)
            .then(res => res.json())
            .then(data => {
                const rate = data.rates[currency_two];
                rateel.innertext = `1 ${currency_one} = ${rate} ${currency_two}`;
                amountel_two.value = (amountel_one.value * rate).tofixed(2);

            });
}

运行效果

原生JS实现简单的汇率转换问题

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