创立 eventHub
兄组件向 eventHub 发送数据
弟组件监听 eventHub 获取数据
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>
<body>
<div id="app">
<div>
<myinput @add="add" />
</div>
<div>
<mylist/>
</div>
</div>
</body>
<script>
const eventHub = new Vue()
Vue.prototype.$eventHub = eventHub
//
Vue.component('myinput', {
template: `
<div>
<input v-model="title">
<button @click="add"> add </button>
</div>
`,
data() {
return {title: '',}
},
methods: {add() {this.$eventHub.$emit('add', this.title)
}
}
})
Vue.component('mylist', {
template: `
<ul>
<li v-for="item in list" :key="item.id">
{{item.title}}
</li>
</ul>
`,
data: function() {
return {list: []
}
},
created() {this.$eventHub.$on('add', (title) => {
this.list.push({id: Math.random(),
title,
})
})
}
})
//
var app = new Vue({el: '#app',})
</script>
</html>