数据服务

package todo

import "sync"

// Item 条目数据
type Item struct {
    SessionID string `json:"-"`
    ID        int64  `json:"id,omitempty"`
    Title     string `json:"title"`
    Completed bool   `json:"completed"`
}

// Service 通用接口
type Service interface {
    Get(owner string) []Item
    Save(owner string, newItems []Item) error
}

// MemoryService 内存服务存储结构
type MemoryService struct {
    // 映射键为sessionid，值是携带sesseionid的item类型组成的列表
    items map[string][]Item
    // 并发访问读写锁
    mu sync.RWMutex
}

// NewMemoryService 初始化
func NewMemoryService() *MemoryService {
    return &MemoryService{
        items: make(map[string][]Item, 0),
    }
}

// Get 读
func (s *MemoryService) Get(sessionOwner string) []Item {
    s.mu.RLock()
    items := s.items[sessionOwner]
    s.mu.RUnlock()
    return items
}

// Save 写
func (s *MemoryService) Save(sessionOwner string, newItems []Item) error {
    var prevID int64
    for i := range newItems {
        if newItems[i].ID == 0 {
            newItems[i].ID = prevID
            prevID++
        }
    }

    s.mu.Lock()
    s.items[sessionOwner] = newItems
    s.mu.Unlock()
    return nil
}

前端 vuejs

        <section class="main" v-show="todos.length" v-cloak="">
            <input type="checkbox" v-model="allDone" class="toggle-all">
            <ul class="todo-list">
                <li v-for="todo in filteredTodos" class="todo" :key="todo.id"
                    :class="{ completed:todo.completed,editing:todo == editedTodo }">
                    <div class="view">
                        <input type="checkbox" @click="completeTodo(todo)" class="toggle">
                        <label @dblclick="editTodo(todo)">{{ todo.title }}</label>
                        <button @click="removeTodo(todo)" class="destroy"></button>
                    </div>
                    <input type="text" v-model="todo.title" v-todo-focus="todo==editedTodo" @blur="doneEdit(todo)"
                        @keyup.enter="doneEdit(todo)" @keyup.esc="cancelEdit(todo)" class="edit">
                </li>
            </ul>
        </section>