<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="./js/vue.js"></script>
</head>
<body>
<div id="app">
<counter ref='one' @change='handleChange'></counter>
<counter ref='two' @change='handleChange'></counter>
<div>{{total}}</div>
</div>
<script>
Vue.component('counter',{
template: '<div @click="handleClick">{{number}}</div>',
data: function(){
return {
number:0
}
},
methods:{
handleClick: function(){
this.number ++
this.$emit('change')
}
}
})
var vm = new Vue({
el: '#app',
data: {
total: 0
},
methods:{
handleChange: function(){
this.total = this.$refs.one.number + this.$refs.two.number
}
}
})
</script>
</body>
</html>
