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+<!-- To-do list 实现增删改查功能，前端界面设计 -->
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>To-do List</title>
+    <link rel="stylesheet" href="demo.css">
+</head>
+<body>
+    <div id="app">
+        <h1>To-do List</h1>
+
+        <!-- 添加新任务 -->
+        <p>What needs to be done?</p>
+        <input type="text" v-model="newTask" placeholder="Enter new task">
+        <button class="add" @click="addTask">Add</button>
+        
+        <!-- 任务完成统计 -->
+        <p>{{ completedCount }} out of {{ tasks.length }} items completed</p>  
+        
+        <!-- 编辑和保存任务 -->
+        <ul class="tasks">
+            <li v-for="(task, index) in tasks" :key="index">
+                <!-- edit时样式 -->
+                <template v-if="editingIndex === index">
+                    <p>Edit Name for "{{ task.name }}"</p>
+                    <input type="text" v-model="editingTask">
+                    <div class="edit-actions">
+                        <button @click="cancelEdit">Cancel</button>
+                        <button @click="saveEdit(index)">Save</button>
+                      </div>
+                </template>
+                <!-- 否则 -->
+                <template v-else>
+                    <input type="checkbox" v-model="task.completed">
+                    <span :class="{ completed: task.completed }">{{ task.name }}</span>
+                    <div class="task-actions">
+                        <button @click="editTask(index)">Edit</button>
+                        <button @click="deleteTask(index)" class="delete">Delete</button>
+                        <button v-if="!task.completed" @click="completeTask(index)">Complete task</button>
+                    </div>
+                </template>
+            </li>
+        </ul>
+    </div>
+    <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
+    <script src="demo.js"></script>
+</body>
+</html>
