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为什么requestAnimationFrame函数接受一个元素作为参数？

[英]Why does requestAnimationFrame function accept an element as an argument?

原文 2011-09-20 15:26:40 6 1 javascript/ html5/ html5-canvas/ html5-animation/ requestanimationframe

I am just trying to understand why the hell window.requestAnimationFrame is accepting the second parameter as an element, what is the reason behind that? 我只是想了解为什么地狱window.requestAnimationFrame接受第二个参数作为一个元素，背后的原因是什么？

I am curious to know the underlying execution for this function.... 我很想知道这个函数的底层执行....

1 个解决方案

It's added so that when an element is out of view (because of scrolling for example), the animation is not run. 它被添加，以便当元素不在视图中时（例如由于滚动），动画不会运行。

From the specs : 从规格：

Editorial note 编辑说明

ISSUE-4 Do we want to allow an Element to be passed to requestAnimationFrame, so that animations affecting the given element are throttled or paused when scrolled out of view? ISSUE-4我们是否要允许将一个Element传递给requestAnimationFrame，以便在滚出视图时影响给定元素的动画会受到限制或暂停？

More information about this issue can be found here . 有关此问题的更多信息，请访问此处。

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requestAnimationFrame将参数传递给以某种方式传递的函数？ - requestAnimationFrame passing an argument to the function it is passed somehow?

回调函数作为window.requestAnimationFrame（）的参数 - callback function as argument of window.requestAnimationFrame()

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JavaScript -WebdriverIO - function 不将元素作为参数 - JavaScript -WebdriverIO - function does not take the element as argument

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