text: function broadcast(componentName, eventName, params) {
    this.$children.forEach(child => {
      var name = child.$options.componentName
  
      if(name === componentName) {
        child.$emit.apply(child, [eventName].concat(params))
      } else {
        broadcast.apply(child, [componentName, eventName].concat(params))
      }
    })
  }
  export default {
    methods: {
      dispatch(componentName, eventName, params) {
        var parent = this.$parent || this.$root
        var name = parent.$options.componentName
  
        while(parent && (!name || name !== componentName)) {
          parent = parent.$parent
  
          if(parent) {
            name = parent.$options.componentName
          }
        }
        if(parent) {
          parent.$emit.apply(parent, [eventName].concat(params))
        }
      },
      broadcast(componentName, eventName, params) {
        broadcast.call(this, componentName, eventName, params)
      }
    }
  }
  