Vue中TodoList案例_本地存储

App.vue

<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <MyHeader :addTodo="addTodo"/>
        <MyList :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo"/>
        <MyFooter :todos="todos" :checkAllTodo="checkAllTodo" :clearAllTodo="clearAllTodo"/>
      </div>
    </div>
  </div>

</template>

<script>
import MyHeader from './components/MyHeader'
import MyList from './components/MyList'
import MyFooter from './components/MyFooter'

export default {
  name:'App',
  components:{MyHeader,MyList,MyFooter},
  data(){
    return{
      todos:JSON.parse(localStorage.getItem('todos')) || []
    }
  },
  methods:{
    //添加一个todo
      addTodo(todoObj){
        this.todos.unshift(todoObj)
    },
    //勾选or取消勾选一个todo
    checkTodo(id){
        this.todos.forEach((todo)=>{
          if (todo.id===id)todo.done=!todo.done
        })
    },
    //删除一个todo
    deleteTodo(id){
        this.todos = this.todos.filter((todo)=>{
            return todo.id !==id
        })
    },
    //全选or取消全选
    checkAllTodo(done){
        this.todos.forEach((todo)=>{
          todo.done = done
        })
    },
    //清除所有已经完成的todo
    clearAllTodo(){
      this.todos = this.todos.filter((todo)=>{
        return !todo.done
      })
    }
  },
  watch:{
    todos:{
      deep:true,
      handler(value){
        localStorage.setItem('todos',JSON.stringify(value))
      }
    }
  }
}
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>

效果：数据存储再localStroage中，刷新浏览器保存的数据仍在。