vue CLI_Todo-List案例

src\App.vue

<template>
<div id="root">
  <div class="todo-container">
    <div class="todo-wrap">
      <MyHeader :addTodo="addTodo"/><!-- 父组件向子组件传递一个函数，然后子组件调用这个函数把需要的值用形参传递过去 -->
      <MyList :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo"/>
      <MyFooter :todos="todos" :checkTodoAll="checkTodoAll" :clearAllTodo="clearAllTodo"/>
    </div>
  </div>
</div>
    
</template>

<script>
    //引入组件
    import MyHeader from "./components/MyHeader.vue";
    import MyList from "./components/MyList.vue";
    import MyFooter from "./components/MyFooter.vue"


    export default {
        name:"App",
        components:{
            MyHeader,
            MyList,
            MyFooter            
        },
        data(){
            return{
                todos:[
                    {id:"002",title:"喝酒",down:false},
                    {id:"001",title:"抽烟",down:true},
                    {id:"003",title:"开车",down:false},
                    {id:"004",title:"学习",down:false}
                ],

            }
        },
        methods:{
          //该方法用来给子组件调用，用于添加一个Todo
          addTodo(todoObj){
            console.log("我是App组件，我收到了数据",todoObj);
            this.todos.unshift(todoObj);
          },
          //改变状态
          checkTodo(id){
            this.todos.forEach(function(item,index){
               if(item.id===id){
                 item.down=!item.down;

                 return;
               }
            });
          },

          //删除
          deleteTodo(id){

            this.todos=this.todos.filter(m=>m.id!=id);
            // this.todos.forEach((val,index)=>{
            //   if(val.id==id){
            //     this.todos.splice(index,1);
            //     return;
            //   }
            // });
          },

          //改变全部的状态
          checkTodoAll(state){
            this.todos.forEach(function(item,index){
                 item.down=state;
            });
          },

          //移除全部已完成
          clearAllTodo(){
          this.todos=this.todos.filter(m=>m.down!=true);
          }

        }
    }

</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>

src\components\MyHeader.vue

<template>
    <div class="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" v-on:keyup.enter="add"/>
    </div>
</template>

<script>

    import{nanoid} from "nanoid";

    export default{
        nmae:"MyHeader",
        data(){
            return{ title:"" }
        },
        //
        props:["addTodo"],
        methods:{
            add(event){

                if(!this.title.trim()) return  alert("不能输入为空"); 
                //方式一：通过event对象拿元素身上的值
                //console.log(event.target.value);

                //方式二：通过v-model拿。
                //console.log(this.title);

                const obj={id:nanoid(),title:this.title,down:false};
                //console.log(obj);

                //子组件里面的数据想要传给父组件需要前提父组件先定义一个函数方法并且将这个函数方法传给子组件，
                //然后子组件的数据代入为函数形参，这样父组件就可以有子组件的数据了。

                //调用父组件传过来的方法
                this.addTodo(obj);


                //清空输入框：
                this.title="";

            }
        }
    }

</script>

<style scoped>
    /*header*/
    .todo-header input {
    width: 560px;
    height: 28px;
    font-size: 14px;
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 4px 7px;
    }

    .todo-header input:focus {
    outline: none;
    border-color: rgba(82, 168, 236, 0.8);
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
    }


</style>

src\components\MyList.vue

<template>
    <ul class="todo-main">
        <MyItem 
        v-for="todoObj in todos" 
        :key="todoObj.id" 
        :todo="todoObj"  
        :checkTodo="checkTodo"
        :deleteTodo="deleteTodo"
        />
      </ul>
</template>

<script>

    import MyItem from "./MyItem.vue";

    export default{
        nmae:"MyList",
        components:{
            MyItem
        },
        props:["todos","checkTodo","deleteTodo"],
    }

</script>

<style scoped>
    /*main*/
    .todo-main {
    margin-left: 0px;
    border: 1px solid #ddd;
    border-radius: 2px;
    padding: 0px;
    }

    .todo-empty {
    height: 40px;
    line-height: 40px;
    border: 1px solid #ddd;
    border-radius: 2px;
    padding-left: 5px;
    margin-top: 10px;
    }

</style>

src\components\MyItem.vue

<template>

    <li>
        <label>
            <input type="checkbox" @change="handleCheck(todo.id)" v-bind:checked="todo.down" />
            <!-- 如下代码也能实现上面代码的功能，但是不推荐，因为违反了原则，修改了propos -->
            <!-- <input type="checkbox" v-model="todo.down" /> -->
            <span>{{todo.title}}</span>
        </label>
        <button class="btn btn-danger" @click="handelDelete(todo.id)">删除</button>
    </li>
</template>

<script>
    export default{
        nmae:"MyItem",
        //声明接收todo对象
        props:["todo","checkTodo","deleteTodo"],
        mounted(){
            //console.log(this);
        },
        methods:{        
            //勾选or取消勾选    
            handleCheck(id){
                this.checkTodo(id);
            },
            //删除
            handelDelete(id){
                if(confirm("要删除吗？"))
                this.deleteTodo(id);
            }
        }

    }

</script>

<style scoped>
    /*item*/
    li {
    list-style: none;
    height: 36px;
    line-height: 36px;
    padding: 0 5px;
    border-bottom: 1px solid #ddd;
    }

    li label {
    float: left;
    cursor: pointer;
    }

    li label li input {
    vertical-align: middle;
    margin-right: 6px;
    position: relative;
    top: -1px;
    }

    li button {
    float: right;
    display: none;
    margin-top: 3px;
    }

    li:before {
    content: initial;
    }

    li:last-child {
    border-bottom: none;
    }

    li:hover{
    background-color:#ddd
    }

    li:hover button{
    display: block;
    }


</style>

src\components\MyFooter.vue

<template>
      <div class="todo-footer" v-show="total">
        <label>
          <input type="checkbox" v-model="isAll"/>
        </label>
        <span>
          <span>已完成{{downTotal}}</span> / 全部{{total}}
        </span>
        <button @click="btnDelete" class="btn btn-danger">清除已完成任务</button>
      </div>    
</template>

<script>
    export default{
        nmae:"MyFooter",
        props:["todos","clearAllTodo","checkTodoAll"],
        computed:{
          downTotal:{
            get(){
              //return this.todos.filter(m=>m.down==true).length;
              return this.todos.reduce((pre,todo)=>pre+(todo.down?1:0),0);
            }
          },
          total(){
            return this.todos.length;
          },
          isAll:{
            get(){
                return this.downTotal==this.total&&this.total>0;
            },
            set(value){
              this.checkTodoAll(value);
            }
          }
        },
        methods:{
          btnDelete(){
            this.clearAllTodo();
          }
        }
    }

</script>

<style scoped>
    /*footer*/
    .todo-footer {
    height: 40px;
    line-height: 40px;
    padding-left: 6px;
    margin-top: 5px;
    }

    .todo-footer label {
    display: inline-block;
    margin-right: 20px;
    cursor: pointer;
    }

    .todo-footer label input {
    position: relative;
    top: -1px;
    vertical-align: middle;
    margin-right: 5px;
    }

    .todo-footer button {
    float: right;
    margin-top: 5px;
    }

</style>

标签：vue,title,todo,border,List,1px,Todo,id,todos
来源： https://www.cnblogs.com/fhzmasl/p/16123027.html