Vue实例 实现todolist的添加删除功能

直接上代码

vm.$emit( eventName, […args] ) 触发当前实例上的事件 可选附加参数 传给监听器回调。

<style>
#app{ margin: 100px; }
#app>input, #app>button, ul li button{ border: none; outline: none; box-shadow: 0 1px 6px #dedede; background: #fff; }
#app>input:focus, #app>button:hover, ul li button:hover{ box-shadow: 0 2px 4px #ccc; }
#app>input{ padding: 6px 10px; width: 200px; }
#app>button{ padding: 6px 10px; height: 30px; cursor: pointer; }
ul{ padding: 0; }
ul li{ width: 280px; list-style: none; margin-top: 10px; }
ul li button{ float: right; width: 30px; cursor: pointer; }
</style>
<div id="app">
    <input v-model="txt" type="text">
    <button @click="handleSubmit">submit</button>
    <ul>
        <todo-item 
            v-for="(item, index) in list"
            :key="index"
            :content="item"
            :index="index"
            @delete="handleDelete"
        ></todo-item>
    </ul>
</div>
<script>
Vue.component('todo-item', {
    props: ['content', 'index'],
    template: '<li>{{index}}. {{content}} <button @click="handleClick">x</button></li>',
    methods: {
        handleClick () {
            this.$emit('delete', this.index)
        }
    }
})
new Vue({
    el: '#app',
    data: {
        txt: '',
        list: []
    },
    methods: {
        handleSubmit () {
            if(!this.txt) return;
            this.list.push(this.txt);
            this.txt = '';
        },
        handleDelete (index) {
            this.list.splice(index, 1)
        }
    }
})
</script>