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<>一、父组件向子组件传值
1.使用props建立数据通道的渠道
// 这是父组件
// 这是子组件
2 . 在子组件中通过props传递过来的数据
Vue,component(‘child’,{
props:[‘message’]
}）
<>二、子组件向父组件传值
在子组件里面定义数据 使用$emit来进行自定义事件的触发 以及数据的发送
<>三、非父子组件传值
利用一个公共的vue来进行传递值和获取值
（是用过一个公共bus这个bus可以是一个dom元素也可以是localStorage或者sessionStorage等等，也是用过 e m i t 发 送 自
定 义 事 件 ， 这 边 需 要 通 过 emit发送自定义事件，这边需要通过emit发送自定义事件，这边需要通过
on获取自定义事件中的数据。如果值很大项目比较复杂就可以用vuex来传值，集中管理状态在购物车结算的时候会用到。）
1.创建一个空的vue\var kong = new Vue()；
2.在组件1中，定义 e m i t 来 发 送 数 据 ∗ ∗ k o n g . emit来发送数据\\**kong. emit来发送数据∗∗kong.
emit(‘test’,‘数据’)**
3.在组件2中使用 o n 来 接 收 传 递 的 数 据 k o n g . on来接收传递的数据 kong. on来接收传递的数据kong.
on(‘test’,function(num) {
this.getData =num;
kong.$off(“test”)
})
<>注：非父子传值也是可以用localstorage 来传值和取值
{
//设置值
localstorage.setItem(‘test’,‘数据’)
//获取值
localstorage.getItem(‘test’)
}
