html代码

Exchange Rate Calculator

Exchange Rate Calculator

Choose the currency and the amounts to get the exchange rate

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