[js]js小demo，待办事项列表

1、初步实现功能，只有前端代码

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>待办事项列表</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            max-width: 600px;
            margin: 0 auto;
            padding: 20px;
            background-color: #f5f5f5;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        .todo-container {
            background-color: white;
            border-radius: 8px;
            padding: 20px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        .input-container {
            display: flex;
            margin-bottom: 20px;
        }
        #todo-input {
            flex: 1;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 4px 0 0 4px;
            font-size: 16px;
        }
        #add-button {
            padding: 10px 15px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 0 4px 4px 0;
            cursor: pointer;
            font-size: 16px;
        }
        #add-button:hover {
            background-color: #45a049;
        }
        ul {
            list-style-type: none;
            padding: 0;
        }
        li {
            padding: 10px;
            border-bottom: 1px solid #eee;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        li:last-child {
            border-bottom: none;
        }
        .todo-text {
            flex: 1;
        }
        .delete-button {
            background-color: #f44336;
            color: white;
            border: none;
            border-radius: 4px;
            padding: 5px 10px;
            cursor: pointer;
        }
        .delete-button:hover {
            background-color: #d32f2f;
        }
        .completed {
            text-decoration: line-through;
            color: #888;
        }
    </style>
</head>
<body>
    <h1>待办事项列表</h1>
    <div class="todo-container">
        <div class="input-container">
            <input type="text" id="todo-input" placeholder="输入新的待办事项...">
            <button id="add-button">添加</button>
        </div>
        <ul id="todo-list"></ul>
    </div>

    <script>
        document.addEventListener('DOMContentLoaded', function() {
            const todoInput = document.getElementById('todo-input');
            const addButton = document.getElementById('add-button');
            const todoList = document.getElementById('todo-list');
            
            // 从本地存储加载待办事项
            let todos = JSON.parse(localStorage.getItem('todos')) || [];
            
            // 渲染待办事项列表
            function renderTodos() {
                todoList.innerHTML = '';
                todos.forEach((todo, index) => {
                    const li = document.createElement('li');
                    
                    const todoText = document.createElement('span');
                    todoText.textContent = todo.text;
                    todoText.className = todo.completed ? 'todo-text completed' : 'todo-text';
                    
                    const deleteButton = document.createElement('button');
                    deleteButton.textContent = '删除';
                    deleteButton.className = 'delete-button';
                    deleteButton.addEventListener('click', () => deleteTodo(index));
                    
                    if (todo.completed) {
                        const toggleButton = document.createElement('button');
                        toggleButton.textContent = '已完成';
                        toggleButton.style.backgroundColor = '#2196F3';
                        toggleButton.style.marginRight = '10px';
                        toggleButton.addEventListener('click', () => toggleTodo(index));
                        li.appendChild(toggleButton);
                    } else {
                        const toggleButton = document.createElement('button');
                        toggleButton.textContent = '完成';
                        toggleButton.style.backgroundColor = '#4CAF50';
                        toggleButton.style.marginRight = '10px';
                        toggleButton.addEventListener('click', () => toggleTodo(index));
                        li.appendChild(toggleButton);
                    }
                    
                    li.appendChild(todoText);
                    li.appendChild(deleteButton);
                    todoList.appendChild(li);
                });
                
                // 保存到本地存储
                localStorage.setItem('todos', JSON.stringify(todos));
            }
            
            // 添加新的待办事项
            function addTodo() {
                const text = todoInput.value.trim();
                if (text) {
                    todos.push({
                        text: text,
                        completed: false
                    });
                    todoInput.value = '';
                    renderTodos();
                }
            }
            
            // 删除待办事项
            function deleteTodo(index) {
                todos.splice(index, 1);
                renderTodos();
            }
            
            // 切换待办事项的完成状态
            function toggleTodo(index) {
                todos[index].completed = !todos[index].completed;
                renderTodos();
            }
            
            // 添加事件监听
            addButton.addEventListener('click', addTodo);
            
            todoInput.addEventListener('keypress', function(e) {
                if (e.key === 'Enter') {
                    addTodo();
                }
            });
            
            // 初始渲染
            renderTodos();
        });
    </script>
</body>
</html>
posted @ 2025-05-29 14:41  harrylearn66666  阅读(20)  评论(0)    收藏  举报