信号器异步响应javascript回调

Question

请您建议将我的响应从 signalR 集线器传递给具有回调的函数调用的最佳方法。我尝试使用全局变量来存储回调并在接收数据时调用它，但没有运气.这就是我喜欢做的事情；

school.lib.setmytime = function(_time){

 console.log('mytime is :' + _time);
}

school.lib.gettime = data.getservertime(school.lib.setmytime);

---

var myhub;

data.connection = function(){
    $connection.hub.url = 'http://myserver.com:65442';
    $connection.hub.start();

    myhub = $.connection.adminHub;

    myhub.client.getServerTime = function (_time){
         //How do i access the callback 
         //function in data.getservertime so as to return time to the 
        //school.lib.gettime?
    }

}

data.getservertime = function(callbak){

    myhub.server.getServerTime();

}

Answer 1

鉴于您当前的设计，您应该将回调传递给 getServerTime 方法：

myhub.client.getServerTime = function (callback){
     //How do i access the callback 
     //function in data.getservertime so as to return time to the 
    //school.lib.gettime?

    // after you have retrieved the time
    if (typeof callback === 'function') {
       callback(school.lib.gettime);
    }
}

...

data.getservertime = function(callback){
   myhub.server.getServerTime(callback);
}