//創(chuàng)建一個vueBus.js
import Bus from 'vue';
let install = function (Vue) {
Vue.prototype.$bus = new Bus()
}

export default {
install
};

//在main.js中引入
import vueBus from '@/utils/vueBus';
Vue.use(vueBus);
//可根據(jù)this.$bus._events['事件名'] 來查看是否存在該事件監(jiān)聽

//在vue3中需要使用mitt插件，直接下載即可
//創(chuàng)建vueBus.ts文件
const init_mitt = mitt()
const emitter:any = {
_events:{},
$emit:init_mitt.emit,
$on:function(t:any,e:any){
this._events[t] = true
init_mitt.on(t,e)
},
$off:function(t:any,e:any){
delete this._events[t]
init_mitt.off(t,e)
}
}
export default emitter

//在main.ts中引入使用
import emitter from '@/utils/vueBus';
app.config.globalProperties.$bus = emitter

//如果需要掛在其他的全局變量上，需要到聲明文件聲明

// utils - bus.js
import Vue from 'vue'
const bus = new Vue()
export default bus

import bus from '@/utils/bus'

us.$emit('message', 'hello');

import bus from '@/utils/bus'

bus.$on('message', (e) => {
?console.log(e)
})

import bus from '@/utils/bus'
mounted () {?
?bus.$on('testA', this.testA)?
},
testA () {
?console.log('由A組件調(diào)用')
}

import bus from '@/utils/bus'
mounted () {
?bus.$emit('testA')
}