Rx.Observable.prototype.concatAll()

通过按顺序连接内部Observables，将高阶Observable转换为一阶Observable。

返回值

(Observable): 一个将所有内部的流连接起来的observable。

例

var clicks = Rx.Observable.fromEvent(document, 'click');
var higherOrder = clicks.map(ev => Rx.Observable.interval(1000).take(4));
var firstOrder = higherOrder.concatAll();
firstOrder.subscribe(x => console.log(x));

// Results in the following:
// (results are not concurrent)
// For every click on the "document" it will emit values 0 to 3 spaced
// on a 1000ms interval
// one click = 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3