1.父给子传值 属性 props:['属性']
2.子给父传 用事件传 $emit
子给父传：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id='app'>
<my-father></my-father>
</div>
<script src='js/vue.js'></script>
<script>
Vue.component("my-father",{
template:`
<div>
<h1>{{mess}}</h1>
<my-child @send='rcvMsg'></my-child>
</div>
`,
data:function(){
return{
mess:''
}
},
methods:{
rcvMsg:function(txt){
this.mess=txt
}
}
})
Vue.component('my-child',{
template:`
<button @click='sendToFather'>传给父元素</button>
`,
data:function(){
return{
msg:'我是子组件中的数据，要给父组件传值'
}
},
methods:{
sendToFather:function(){
// this.$emit('自定义事件名',要传输的数据)
this.$emit('send',this.msg)
}
}
})
new Vue({
el:"#app"
})
</script>
</body>
</html>
