第214练的最终效果：
完整的实现代码：
HTML:
<!DOCTYPE html><html lang=”en”><head><meta charset=”UTF-8″><meta http-equiv=”X-UA-Compatible” content=”IE=edge”><meta name=”viewport” content=”width=device-width, initial-scale=1.0″><title>214练-年龄计算器</title><link rel=”stylesheet” href=”index.css”></head><body><div class=”container”><h1>年龄计算器</h1><div class=”form”><label for=”birthday”>输入您的出生年月日</label><input type=”date” id=”birthday” name=”birthday”><button id=”btn”>开始计算</button><p id=”result”>你的年龄是…</p></div></div><script src=”index.js”></script></body></html>
CSS:
body {margin: 0;padding: 20px;font-family: “Montserrat”, sans-serif;background-color: #f7f7f7;}.container {background-color: white;box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);padding: 20px;max-width: 600px;margin: 0 auto;border-radius: 5px;margin-top: 50px;}h1 {font-size: 36px;text-align: center;margin-top: 0;margin-bottom: 20px;}.form {display: flex;flex-direction: column;align-items: center;}label {font-weight: bold;margin-bottom: 10px;}input {padding: 8px;border: 1px solid #ccc;border-radius: 5px;width: 100%;max-width: 300px;}button {background-color: #007bff;color: white;border: none;padding: 10px 20px;border-radius: 5px;margin-top: 10px;cursor: pointer;transition: background-color 0.3s ease;}button:hover {background-color: #0062cc;}#result {margin-top: 20px;font-size: 24px;font-weight: bold;}
JS:
const btnEl = document.getElementById(“btn”);const birthdayEl = document.getElementById(“birthday”);const resultEl = document.getElementById(“result”);function calculateAge() {const birthdayValue = birthdayEl.value;if (birthdayValue === “”) {alert(“请输入您的出生年月日”);} else {const age = getAge(birthdayValue);resultEl.innerText = ` ${age} ${age > 1 ? “岁” : “year”} `;}}function getAge(birthdayValue) {const currentDate = new Date();const birthdayDate = new Date(birthdayValue);let age = currentDate.getFullYear() – birthdayDate.getFullYear();const month = currentDate.getMonth() – birthdayDate.getMonth();if (month < 0 ||(month === 0 && currentDate.getDate() < birthdayDate.getDate())) {age–;}return age;}btnEl.addEventListener(“click”, calculateAge);
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