Vue.js父与子组件之间传参示例

childWords: ""
}
},
components: {
componentA
},
methods: {
listenToMyBoy: function (msg){
this.childWords = msg
}
}
})
}

componentA.vue中

<button v-on:click="onClickMe">like!</button>

import componentA from './components/componentA'
export default {
data: function () {
return {
msg: 'I like you!'
}
},
methods: {
onClickMe: function(){
this.$emit('child-say',this.msg);
}
}
}

子组件向父传参（.$dispatch）

用法：vm.$dispatch( event, […args] )，派发事件，首先在实例上触发它，然后沿着父链向上冒泡在触发一个监听器后停止。

例子：App.vue中events中注册”child-say”事件。子组件componentA中，单击按钮后触发”child-say”事件，并传参msg给父组件。父组件中”child-say”方法把msg赋值给childWords，显示在<p>标签中。

App.vue中

<p>Do you like me? {{childWords}}</p>
<component-a msgfromfa="(Just Say U Love Me)"></component-a>

import componentA from './components/componentA'
export default {
new Vue({
events: {
'child-say' : function(msg){
this.childWords = msg
}
}
})
}

componentA.vue中

<button v-on:click="onClickMe">like!</button>

import componentA from './components/componentA'
export default {
data: function () {
return {
msg: 'I like you!'
}
},
methods: {
onClickMe: function(){
this.$dispatch('child-say',this.msg);
}
}
}