父组件给子组件传值
使用props,父组件可以使用props向子组件传递数据
父组件vue模板father. vue

<template>
    <child :msg="message"></child>
</template>
<script>
import child from './child. vue';
export default {
    components: {
        child
    },
    data () {
        return {
            message: ' father message';
        }
    }
}
</script>

子组件vue模板child. vue:

<template>
<div>{{msg}}</div>
</template>
<script>
export default {
props: {
msg: {
type: String,
required: true
}
}
}
</script>

子组件向父组件通信
父组件向子组件传递事件方法,子组件通过$emit触发事件,回调给父组件
父组件vue模板father. vue:

<template>
<child @msgFunc="func"></child>
</template>
<script>
import child from './child. vue';
export default {
components: {
child
},
methods: {
func (msg) {
console. log(msg);
}
}
}
</script>

子组件vue模板child. vue:

<template>
    <button @click="handledick">点我</button>
</template>
<script>
export default {
    props: {
        msg: {
            type: String,
            required: true
        }
    },
    methods () {
        handledick () {
        //  
            this. $emit('msgFunc');
        )
    }
}
</script>

非父子,兄弟组件之间通信
可以通过实例一个vue实例Bus作为媒介,要相互通信的兄弟组件之中,都引入Bus,然后通 过分别调用Bus事件触发和监听来实现通信和参数传递
Bus. js可以是这样:

import Vue from 'vue'
export default new Vue()

在需要通信的组件都引入Bus. js:

<template>
    <button @click="toBus">子组件传给兄弟组件</button>
</template>
<script>
import Bus from '.. /common/js/bus. js'
export default{
    methods: {
        toBus () {
            Bus.$emit ('on',来自兄弟组件')
        }
    }
}
</script>

另一个组件也import Bus. js在钩子函数中监听on事件

import Bus from '.. /common/js/bus. js'
export default {
    data () {
        return {
            message: ' '
        },
        mounted () {
            Bus.$on('on', (msg) => {
            this.message = msg
        })
    }
}

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