class Event{
constructor(){
this.callbacks = {}
}
set(key, value){
if(!key)
return

if(key in this.callbacks)
(this.callbacks[key])(value)
}
on(key, fn){
if(!key || typeof(fn) != 'function'){
return false
}
this.callbacks[key] = fn
return true
}
}

export default new Event()



A页面
import event from '../../utils/event'
onShow(){
event.on('classifyId',(classifyId)=>{
1. 监听B页面返回的值
2. 执行刷新xxx

})
}

}
B页面
import event from '../../utils/event'


onBack(){
event.set('classifyId',{})
wx.navigateBack({ delta:1 })
}