// utils/render-bus.js
class RenderEventBus {
  constructor() {
    this.listeners = {}
  }
  
  // 注册监听
  $on(event, callback) {
    if (!this.listeners[event]) {
      this.listeners[event] = []
    }
    this.listeners[event].push(callback)
  }
  
  // 触发事件
  $emit(event, data) {
    if (this.listeners[event]) {
      this.listeners[event].forEach(callback => {
        callback(data)
      })
    }
  }
  
  // 移除监听
  $off(event, callback) {
    if (this.listeners[event]) {
      const index = this.listeners[event].indexOf(callback)
      if (index > -1) {
        this.listeners[event].splice(index, 1)
      }
    }
  }
}

const MyRenderEventBus = new RenderEventBus();

export {MyRenderEventBus};