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| <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Document</title> </head>
<body> <form> <input type="text" class="input-todo" placeholder="enter todo!" /> <button class="add">등록</button> </form>
<ul class="todos">
</ul> <script> let todos = [];
const $todos = document.querySelector(".todos"); const $inputTodo = document.querySelector(".todos");
const render = () => { $todos.innerHTML = todos .map( ({ id, content, completed }) => `<li id="${id}"> <input type="checkbox" ${completed ? "checked" : ""}> <span>${content}</span> <button class="remove">X</button> </li>` ) .join(""); };
const fetchTodos = () => { todos = [ { id: 1, content: "HTML", completed: true }, { id: 2, content: "CSS", completed: true }, { id: 3, content: "Javascript", completed: false }, ];
todos = [...todos].sort((todo1, todo2) => todo2.id - todo1.id); render(); };
const addTodo = (() => { const generateId = () => Math.max(...todos.map((todo) => todo.id)) + 1;
return (content) => { todos = [ { id: generateId(), content, completed: false, }, ...todos, ]; render(); }; })();
const removeTodo = (id) => { todos = todos.filter((todo) => todo.id !== id); render(); };
document.addEventListener("DOMContentLoaded", fetchTodos);
document.querySelector("form").onsubmit = (e) => { e.preventDefault(); const content = $inputTodo.value; if (!content) return;
addTodo(content); $inputTodo.value = ""; $inputTodo.focus(); };
$todos.onclick = (e) => { if (!e.target.matches(".todos > li > button.remove")) return;
removeTodo(+e.target.parentNode.id); }; </script> </body> </html>
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