油门时间运算符的config参数如何工作?(ThrottleConfig) [英] How does throttleTime operator's config parameter work? (ThrottleConfig)

问题描述

我已经阅读了 throttleTime文档，但是我没有得到完全操作.

I have read the throttleTime documentation, but I don't get the operator fully.

我知道 throttleTime(1000)的工作方式.事件到达后，它将跳过所有后续事件1秒钟，然后再次开始此过程.

I know how throttleTime(1000) works. After an event arrives it will skip all subsequent events for 1 second and then start this process again.

我很难理解的是 ThrottleConfig 的工作原理，这是运算符的第三个参数.

What I have trouble to understand is how exactly ThrottleConfig works, which is the third parameter of the operator.

throttleTime<T>(
  duration: number, 
  scheduler: SchedulerLike = async, 
  config: ThrottleConfig = defaultThrottleConfig): MonoTypeOperatorFunction<T>

前导和 trailing 属性如何更改源Observable的功能?

How do leading and trailing properties change the functionality of the source Observable?

我已经阅读了许多文档，但是他们并没有清楚地解释这一点.

I have read many documentations but they don't clearly explain this.

所以有四个选项:

1. {开头:true，结尾:false} :
   默认选项，在接收事件后，将在指定的持续时间内跳过其他事件，然后重复执行.
2. {开头:false，结尾:true} :
   ???
3. {开头:false，结尾:false} :
   经过测试，Observable根本不发出任何东西.
4. {前导:true，结尾:true} :
   ???

推荐答案

throttleTime 将开始一个新的节气门间隔(不发射任何物品的时间段)当它收到一个新值并且尚未受到限制时.节气门间隔的长度由您提供的持续时间决定.

throttleTime will start a new throttle interval (a time period in which no items will be emitted) when it receives a new value and isn't already throttled. The length of this throttle interval is determined by the duration you supply.

前导和 trailing 指定是在油门时间间隔的开始还是结束时发射项目.

leading and trailing specify whether an item should be emitted at the beginning or end of a throttle interval.

前导: 发出在节气门间隔的开头开始新的节气门间隔的项目.

leading: Emit the item that starts a new throttle interval at the beginning of the throttle interval.

跟踪: 在油门时间间隔结束时发出从源接收的最后一个项目.

trailing: Emit the last item received from the source at the end of a throttle interval.

throttleTime(12 ticks, async, { leading: true, trailing: false })

source:              --0--1-----2--3----4--5-6---7------------8-------9--------
throttle interval:   --[~~~~~~~~~~~~]---[~~~~~~~~~~~~]--------[~~~~~~~~~~~~]---
output:              --0----------------4---------------------8----------------

throttleTime(12 ticks, async, { leading: false, trailing: true })

source:              --0--1-----2--3----4--5-6---7------------8-------9--------
throttle interval:   --[~~~~~~~~~~~~]---[~~~~~~~~~~~~]--------[~~~~~~~~~~~~]---
output:              ---------------3----------------7---------------------9---

throttleTime(12 ticks, async, { leading: true, trailing: true })

source:              --0--1-----2--3----4--5-6---7------------8-------9--------
throttle interval:   --[~~~~~~~~~~~~]---[~~~~~~~~~~~~]--------[~~~~~~~~~~~~]---
output:              --0------------3---4------------7--------8------------9---

throttleTime(12 ticks, async, { leading: false, trailing: false })

source:              --0--1-----2--3----4--5-6---7------------8-------9--------
throttle interval:   --[~~~~~~~~~~~~]---[~~~~~~~~~~~~]--------[~~~~~~~~~~~~]---
output:              ----------------------------------------------------------

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