Question

我有一个由插座供电的热观察器。我可以使用pausable暂停套接字Feed。但是，一旦我“停止”＆＃39;在observable中，我需要显示套接字在暂停订阅时可能发送的最后一个值。我不想跟踪套接字手动发送的最后一个值......这怎么可能是合理的？

从文档中的示例，请参阅以下注释：

var pauser = new Rx.Subject();
var source = Rx.Observable.fromEvent(document, 'mousemove').pausable(pauser);

var subscription = source.subscribe(
    function (x) {
        //somehow after pauser.onNext(true)...push the last socket value sent while this was paused...
        console.log('Next: ' + x.toString());
    },
    function (err) {
        console.log('Error: ' + err);
    },
    function () {
        console.log('Completed');
    });

// To begin the flow
pauser.onNext(true); 

// To pause the flow at any point
pauser.onNext(false);

Answer 1

您甚至不需要pausable来执行此操作。（请注意，您标记为RxJS5但pausable仅存在于RxJS 4）。您只需将pauser转换为更高的订单Observable：

var source = Rx.Observable.fromEvent(document, 'mousemove')
  // Always preserves the last value sent from the source so that
  // new subscribers can receive it.
  .publishReplay(1);

pauser
  // Close old streams (also called flatMapLatest)
  .switchMap(active => 
    // If the stream is active return the source
    // Otherwise return an empty Observable.
    Rx.Observable.if(() => active, source, Rx.Observable.empty())
  )
  .subscribe(/**/)

//Make the stream go live
source.connect();

RxJS - 暂停，在恢复时给出最后一个暂停值

1 个答案: