Besides converting arrays and promises to Observables, we can also convert other structures to Observables. This lesson teaches how we can convert any addEventHandler/removeEventHandler API to Observables.
var foo = Rx.Observable.fromEvent(document, ‘click‘); foo.subscribe(function (x) { console.log(‘next ‘ + x); }, function (err) { console.log(‘error ‘ + err); }, function () { console.log(‘done‘); });
fromEventPattern(addEventHandler, removeEventHandler): take two functions
function addEventHandler(handler){ document.addEventListener(‘click‘, handler) } function removeEventHandler(handler){ document.removeEventListener(‘click‘, handler) } var foo = Rx.Observable.fromEventPattern(addEventHandler, removeEventHandler); foo.subscribe(function (x) { console.log(‘next ‘ + x); }, function (err) { console.log(‘error ‘ + err); }, function () { console.log(‘done‘); });
[RxJS] Creation operators: fromEventPattern, fromEvent
原文：http://www.cnblogs.com/Answer1215/p/5389543.html