var events = {}

function on(name, self, callback) {
  var tuple = [self, callback]
  var callbacks = events[name]
  if (Array.isArray(callbacks)) {
    callbacks.push(tuple)
  } else {
    events[name] = [tuple]
  }
}

function remove(name, self) {
  var callbacks = events[name]
  if (Array.isArray(callbacks)) {
    events[name] = callbacks.filter((tuple) => {
      return tuple[0] != self
    })
  }
}

function emit(name, data) {
  var callbacks = events[name]
  if (Array.isArray(callbacks)) {
    callbacks.map((tuple) => {
      var self = tuple[0]
      var callback = tuple[1]
      callback.call(self, data)
    })
  }
}

exports.on = on
exports.remove = remove
exports.emit = emit
/****
 * Event:what说明：200表示vip兑换或者购买成功
 * 
 * 
 */