RxJS.Observable debounce有什么作用？ [英] What does RxJS.Observable debounce do?
问题描述
任何人都可以用简单的英语解释 RxJS Observavle去抖功能吗？
Can anybody explain in plain English what RxJS Observavle debounce function does?
我想它会偶尔发出一个事件，具体取决于参数，但我的代码不起作用正如我所料。
I imagine it emits an event once in a while depending on the parameters, but my code below doesn't work as I expected.
var x$ = Rx.Observable.fromEvent(window, 'click')
.map(function(e) {return {x:e.x, y:e.y};})
.debounce(1000)
.subscribe(function(el) {
console.log(el);
});
和 JsBin版本。
我希望这段代码每秒打印一次，无论多快我点击了。相反，它打印我认为是随机间隔的点击。
I expected that this code would print one click once per second, no matter how fast I am clicking. Instead it prints the click at what I think are random intervals.
推荐答案
在指定的时间间隔过去后，去抖将发出一个值没有其他值被发出。
Debounce will emit a value after a specified time interval has passed without another value being emitted.
使用简单的图表可以提供更多帮助：
Using simple diagrams the following may provide greater help:
Stream 1 | ---1-------2-3-4-5---------6----
after debounce, the emitted stream looks like as follows:
Stream 2 | ------1-------------5---------6-
中间项（在本例中为2,3,4）将被忽略。
The intermediate items (in this case, 2,3,4) are ignored.
下面举例说明：
var Rx = require('rx-node');
var source = Rx.fromStream(process.stdin).debounce(500);
var subscription = source.subscribe(
function (x) {
console.log('Next: %s', x);
}
);
我用节点来说明这一点...假设您已经安装了节点，可以通过键入来运行它
I used node to illustrate this... assuming you have node installed, you can run it by typing
$node myfile.js (where the aforementioned code is in myfile.js)
启动此节点程序后，您可以在控制台上键入值 - 如果您快速键入，则会忽略项目，如果间歇性地输入快速和慢速项目将在控制台上输入的间隙（在上面的示例中我有500毫秒）之后出现（下一个：）
Once this node program is started you can type values at the console -- if you type quickly items are ignored, and if type intermittently fast and slow items will appear after a gap in typing (in the example above I have 500ms) at the console ("Next: ")
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