原生JS实现简单的汇率转换问题

2021-03-12 20:29

阅读:716

YPE html>

标签:UNC   rip   转换问题   text   size   ascii   inter   nim   enter   

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

技术图片

原生JS实现简单的汇率转换问题

标签:UNC   rip   转换问题   text   size   ascii   inter   nim   enter   

原文地址:https://www.cnblogs.com/TomHe789/p/12824566.html


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