微信小程序中實現(xiàn)一對多發(fā)消息詳解及實例代碼

var notificationCenter = require('/utils/notification.js'); //這里請改為你的絕對路徑

App({
  onLaunch: function (){
     this.notificationCenter = notificationCenter.center();
  },
  notificationCenter:null,
})

var app = getApp();
Page({
 onLoad:function(options){
 app.notificationCenter.register("一個通知名稱",this,"didReceviceAnyNotification");
 },
 didReceviceAnyNotification:function(name,content){
  console.log("接收到了通知：",name, content);
 },
})

var app = getApp();
Page({
 anyFunction:function(){
  app.notificationCenter.post("通知名稱",{
    //任意通知object
  })  ;
 },
})

var notificationCenter = {

notificationCenter:{},

// 向通知中心注冊一個監(jiān)聽者。
// name: 監(jiān)聽的通知名稱
// observer: 監(jiān)聽者
// action: 監(jiān)聽者收通知時調用的方法名，
// func: 監(jiān)聽者收到通知時調用的函數(shù)，
// action func 2選1
register:function(name,observer,action,func){
  if (!name || !observer) return;
  if (!action && !func) return;

  console.log("注冊通知：",name,observer);

  var center = this.notificationCenter;
  var objects = center[name];
  if (!objects){
    objects = [];
  }
  this.remove(name,observer);
  objects.push({
    observer:observer,
    action:action,
    func:func
  });
  center[name] = objects;
},
// 從通知中心移除一個監(jiān)聽者
remove:function(name,observer){
  if (!name || !observer) return;

  var center = this.notificationCenter;
  var objects = center[name];
  if (!objects){
    return;
  }

  var idx;
  var object;
  for(idx = 0;idx<objects.length;idx++){
    var obj = objects[idx];
    if (obj.observer == observer){
    object = obj;
    break;
    }
  }
  if (object){
    objects.splice(idx,1);
  }
  center[name] = objects;
},
// 通過通知中心發(fā)出通知
// name: 通知名稱
// notification: 通知內容
post:function(name,notification){
  if (!name) return;

  console.log("準備發(fā)出通知：",name,notification);

  var center = this.notificationCenter;
  var objects = center[name];
  if (!objects){
    objects = [];
  }
  objects.forEach(function(object){
    var observer = object.observer;
    var action = object.action;
    var func = object.func;

    if (observer && action){
      func = observer[action];
    }
    func(notification);
  });

  console.log("完成向 ",objects.length," 個監(jiān)聽者發(fā)出通知：",name);
}
}

function center(){
  return notificationCenter;
}

module.exports.center = center;