概念

防抖(debounce)

當持續觸發事件時，一定時間段內沒有再觸發事件，事件處理函數才會執行一次，如果設定時間到來之前，又觸發了事件，就重新開始延時

節流(throttle)

當持續觸發事件時，保證在一定時間內只調用一次事件處理函數，意思就是說，假設一個用戶一直觸發這個函數，且每次觸發小于既定值，函數節流會每隔這個時間調用一次

區別

防抖是將多次執行變為最后一次執行
節流是將多次執行變為每隔一段時間執行

Java實現

防抖(debounce)

public class DebounceTask {private Timer timer;private Long delay;private Runnable runnable;public DebounceTask(Runnable runnable, Long delay) {this.runnable = runnable;this.delay = delay;}public static DebounceTask build(Runnable runnable, Long delay){return new DebounceTask(runnable, delay);}public void run(){if(timer!=null){timer.cancel();}timer = new Timer();timer.schedule(new TimerTask() {@Overridepublic void run() {timer=null;runnable.run();}}, delay);} }

節流(throttle)

public class ThrottleTask {private Timer timer;private Long delay;private Runnable runnable;private boolean needWait=false;public ThrottleTask(Runnable runnable, Long delay) {this.runnable = runnable;this.delay = delay;this.timer = new Timer();}public static ThrottleTask build(Runnable runnable, Long delay){return new ThrottleTask(runnable, delay);}public void run(){if(!needWait){needWait=true;timer.schedule(new TimerTask() {@Overridepublic void run() {needWait=false;runnable.run();}}, delay);}} }

測試

防抖(debounce)

DebounceTask task = DebounceTask.build(new Runnable() {@Overridepublic void run() {System.out.println("do task: "+System.currentTimeMillis());} },1000L); long delay = 100; while (true){System.out.println("call task: "+System.currentTimeMillis());task.run();delay+=100;try {Thread.sleep(delay);} catch (InterruptedException e) {e.printStackTrace();} }

節流(throttle)

ThrottleTask task = ThrottleTask.build(new Runnable() {@Overridepublic void run() {System.out.println("do task: "+System.currentTimeMillis());} },1000L); while (true){System.out.println("call task: "+System.currentTimeMillis());task.run();try {Thread.sleep(200);} catch (InterruptedException e) {e.printStackTrace();} }

總結

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