原生JS怎么实现汇率转换功能

2024-12-03 技术教程

这篇文章主要为大家展示了原生JS怎么实现汇率转换功能，内容简而易懂，希望大家可以学习一下，学习完之后肯定会有收获的，下面让小编带大家一起来看看吧。

代码如下

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" rel="external nofollow" /></head><body><img src="money.png" class="money-img" /><h2>Exchange Rate Calculator</h2><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;}h2 {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

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