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While practicing the use of the vue framework and writing a todo demo, I put the input element (new-input component) and the ul and li elements ( todo-items and todo-item components) are written as two parallel components. Now enter text to add in the input component, use the public event bus to trigger the update event, and create a hook function in the life cycle of the todo-items component to listen to the update event and Modify the data in the component, and then the problem comes. The error message shows that the todos array of the component is undefined

#Post the code below

var bus = new Vue({});

var todoItem = Vue.component('todo-item', {
    props:['todo'],
    template:'<li class="animated fadeIn cusFont" v-bind:class="{ done:isDone }"><span><button class="done" v-on:click="done" v-bind:class="{doneButton: isDone}"></button></span><p v-bind:class="{doneItem:isDone}">{{todo.text}}</p><button class="delete" v-on:click="deleteIt">×</button></li>',
    data:function(){
        return {
            isDone:false
        }
    },
    methods:{
        done:function(){
            this.$emit('hasDone');
            this.isDone = !this.isDone;
        },
        deleteIt:function(){
            this.$emit('hasDelete');
        }
    }    
});
var todoItems = Vue.component('todo-items', {
    template:'<ul><todo-item v-for="(item, index) in todos" v-bind:todo="item" v-on:hasDelete="deleteItem(index)"></todo-item></ul>',
    data:function(){
        return {
            todos:[
                {text:'nodeJS'},
                {text:'vue.js'}
            ]
        }
    },
    components:{
        'todo-item':todoItem
    },
    methods:{
        deleteItem:function(index){
            this.todos.splice(index, 1);
        },
        update:function(value){
            this.todos.push(value);
        }
    },
    created(){
        bus.$on('updateData', function(value){
            this.todos.push(value);
        })
    }
})

var newInput = Vue.component('new-input', {
    template:'<input ref="input" placeholder="What needs to be done?" id="js-input-item" v-bind:value="value" class="animated fadeIn cusFont" v-on:keyup.enter="update">',
    data:function(){
        return {
            value:''
        }
    },
    methods:{
        update:function(){
            bus.$emit('updateData', {text:this.$refs.input.value});
        }
    }
})

var todo = new Vue({
    el:'#todo',
    components:{
        "todo-items":todoItems,
        "new-input":newInput
    }
})

For some unknown reason, the deleteItem method in todo-items can also operate the todos array.