See a practical example of reactive programming in JavaScript and the DOM. Learn how to detect double clicks with a few operators in RxJS.
<!DOCTYPE html> <html> <head> <script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/2.3.22/rx.all.js"></script> <meta charset="utf-8"> <title>JS Bin</title> </head> <body> <div class="header"> <a href="#" class="button">BUTTON</a><h4>-</h4> </div> </body> </html>
var button = document.querySelector(‘.button‘); var h4 = document.querySelector(‘h4‘); var clicks = Rx.Observable.fromEvent(button, ‘click‘); var doubleClicks = clicks .buffer(() => clicks.throttle(250)) // buffer the events, for each event debounce 250ms and group together .map(arr => arr.length) // for each group, count the lengh of event .filter(x => x ===2); // only pick length === 2 which means double click var res = doubleClicks.subscribe( () => { h4.textContent = "double click" }); doubleClicks.throttle(1000).subscribe(() => { h4.textContent = "-"; });
[Reactive Programming] Using an event stream of double clicks
原文：http://www.cnblogs.com/Answer1215/p/4851858.html