尝试获取CoinGecko API和用户输入进行计算，然后输出

我已经尝试了一段时间，但似乎无法让我的新手理解这一点。我可以安慰log硬币，但似乎无法让它与"相乘；btcnumber’输入，然后更新。innerText

const api_url = "https://api.coingecko.com/api/v3/simple/price?ids=bitcoin%2Cethereum%2Cbinancecoin%2Ccardano%2Csolana%2Cterra-luna&vs_currencies=usd";
async function getData() {
const response = await fetch(api_url);
const data = await response.json();
console.log(data.bitcoin.usd);
}
getData();

function coinValue() {
let bitcoin = parseInt(document.getElementById("btcnumber") * (data.bitcoin.usd));
document.getElementById("c-v").innerText = bitcoin.toFixed(8);
}
document.addEventListener("DOMContentLoaded", function() {
let submit = document.getElementById("calculateButton");
calculateButton.addEventListener("click", function() {
coinValue()
})
})

<input id="btcnumber" type="number" class="form-control" placeholder="Number Purchased">

<button id="calculateButton" onclick=coinValue()>Calculate</button>
<h4>CURRENT VALUE <span id="c-v"></span></h4>

发生这种情况是因为coinValue()函数中不存在data变量。将其放在函数之外，使其成为全局变量。

此外，在coinValue()函数中，您必须在乘法结束时将.value相加，以获得输入的实际值。

let data;
const api_url = "https://api.coingecko.com/api/v3/simple/price?ids=bitcoin%2Cethereum%2Cbinancecoin%2Ccardano%2Csolana%2Cterra-luna&vs_currencies=usd";
async function getData() {
const response = await fetch(api_url);
data = await response.json();
console.log(data.bitcoin.usd);
}
getData();

function coinValue() {
let bitcoin = parseInt(document.getElementById("btcnumber").value * (data.bitcoin.usd));
document.getElementById("c-v").innerText = bitcoin.toFixed(8);
}
document.addEventListener("DOMContentLoaded", function() {
let submit = document.getElementById("calculateButton");
calculateButton.addEventListener("click", function() {
coinValue()
})
})

<input id="btcnumber" type="number" class="form-control" placeholder="Number Purchased">

<button id="calculateButton" onclick=coinValue()>Calculate</button>
<h4>CURRENT VALUE <span id="c-v"></span></h4>

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