underscore.js：_.throttle（函数，等待） [英] underscore.js: _.throttle(function, wait)

问题描述

根据下划线文档：

throttle_.throttle（函数，等待）

创建并返回传递函数的新的
限制版本，当调用$ b $时b重复，实际上每次等待几毫秒才会实际调用原始函数
。对于限制价格的事件非常有用，因为
出现的速度比你能跟上的速度要快。

throttle_.throttle(function, wait)
Creates and returns a new, throttled version of the passed function, that, when invoked repeatedly, will only actually call the original function at most once per every wait milliseconds. Useful for rate-limiting events that occur faster than you can keep up with.

这是什么意思对于速度限制事件非常有用，它发生得比你能跟上更快。

这个函数等同于setTimeout，它有一个调用自身的函数？

有人可以在jsfiddle上给我一些例子吗？

What does it means Useful for rate-limiting events that occur faster than you can keep up with.
This function is equivalent to setTimeout with a function that calls itself?
Can someone provide me some example on jsfiddle?

推荐答案

这不仅仅是setTimeout（）
试试这个

it's not just setTimeout() Try this

var a = _.throttle(function(){console.log('called')}, 1000);
while(true) {
  a();
}

它将每秒调用一次，而不是每次迭代调用一次。
在原生JS中它看起来像：

it will be called once every second and not once every iteration. In native JS it would look like:

var i = null;
function throttle(func, delay){
  if (i) {
      window.clearTimeout(i);
  }
  i = window.setTimeout(func, delay)
}

不完全相同，只是为了说明函数被调用一次

not exactly the same, but just to illustrate that the function is called once

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