[英]function method to unsubscribe from observable
Cannot read property 'unsubscribe' of undefined无法读取未定义的属性“取消订阅”
function record(){
this.event
}
record.prototype = {
start: function (){
keyUp = Rx.Observable.fromEvent(document, "keyup");
this.event = keyUp.subscribe((key) => {console.log(key)});
},
stop: function (){
this.event.unsubscribe();
}
}
rec = new record();
rec.start();
setTimeout(rec.stop, 2000);
https://jsfiddle.net/yn70k2g9/ https://jsfiddle.net/yn70k2g9/
In this context this
is the window object and not record
.在这种情况下this
是 window 对象而不是record
。
function record(){
event;
}
record.prototype = {
start: function (){
keyUp = Rx.Observable.fromEvent(document, "keyup");
record.event = keyUp.subscribe((key) => {console.log(key)});
},
stop: function (){
record.event.unsubscribe();
}
}
rec = new record();
rec.start();
setTimeout(rec.stop, 2000);
https://jsfiddle.net/yn70k2g9/5/ https://jsfiddle.net/yn70k2g9/5/
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