<html>
<head>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
<div id="app">
<child content="dent"></child>
<child content="lett"></child>
</div>
</body>
<script>
Vue.prototype.bus=new Vue()//给Vue绑定一个bus
Vue.component('child',{
data:function(){
return {
selfContent:this.content//把this.content的值返回给selfContent，给后面操作
}
},
props:{
content:String
},
template:'<div @click="handleClick">{{selfContent}}</div>',
methods:{
handleClick:function(){
this.bus.$emit('change',this.selfContent)//触发事件用this.bus.$emit，传递参数this.content
}
},
mounted:function(){//钩子
var this_=this//当前对象，也就是为了改变当前对象的数据
this.bus.$on('change',function(msg){//监听事件.msg是接收到传递的this.content
this_.selfContent=msg//改变selfContent的数据
})
}
})
var app=new Vue({
el:'#app',
})
</script>
</html>
