多个页面传参通信在微信小程序中的实现

var pages = getCurrentPages();
var currPage = pages[pages.length - 1]; //当前页面
var prevPage = pages[pages.length - 2]; //上一个页面

//直接调用上一个页面的setData()方法，把数据存到上一个页面中去
prevPage.setData({
 mdata:1 
})

var onfire = require("../utils/onfire.js");
var that;
var eventObj = onfire.on('key', function () {
 //做具体的事
});

Page({
 data: {
 },
 onLoad: function(options) {
 // Do some initialize when page load.
 },
 onReady: function() {
 // Do something when page ready.
 },
 onUnload: function (e) {
 onfire.un('key');
 onfire.un(eventObj2);
 }
})

 onfire.fire('key');//key为上文中订阅的消息
 //有参数时
 onfire.fire('key','test');

 function _bind(eventName, callback, is_one, context) {
 if (typeof eventName !== string_str || typeof callback !== function_str) {
  throw new Error('args: '+string_str+', '+function_str+'');
 }
 if (! hasOwnKey(onfireEvents, eventName)) {
  onfireEvents[eventName] = {};
 }
 onfireEvents[eventName][++cnt] = [callback, is_one, context];

 return [eventName, cnt];
 }

 function _fire_func(eventName, args) {
 if (hasOwnKey(onfireEvents, eventName)) {
  _each(onfireEvents[eventName], function(key, item) {
  item[0].apply(item[2], args); //执行订阅时的方法
  if (item[1]) delete onfireEvents[eventName][key]; // 当类型为只订阅一次时，通知后即移除自己。
  });
 }
 }

 function un(event) {
 var eventName, key, r = false, type = typeof event;
 if (type === string_str) {
  // 如果存在key值，则移除数组
  if (hasOwnKey(onfireEvents, event)) {
  delete onfireEvents[event];
  return true;
  }
  return false;
 }
 else if (type === 'object') {
  eventName = event[0];
  key = event[1];
  //如果找到这个对象则卸载
  if (hasOwnKey(onfireEvents, eventName) && hasOwnKey(onfireEvents[eventName], key)) {
  delete onfireEvents[eventName][key];
  return true;
  }
  //否则返回false
  return false;
 }
 else if (type === function_str) {
  //两层循环来判断是否是方法名
  _each(onfireEvents, function(key_1, item_1) {
  _each(item_1, function(key_2, item_2) {
   if (item_2[0] === event) {
   delete onfireEvents[key_1][key_2];
   r = true;
   }
  });
  });
  return r;
 }
 return true;
 }