javascript将事件绑定到类名的更改 [英] javascript bind an event to a change of classname

问题描述

在javascript/jQuery中是否可以将函数绑定到DOM元素的类名更改或分配给新的类上?

Is it possible in javascript / jQuery to bind a function to a DOM element's classname changing or being assigned a new class?

推荐答案

否，更新该类时不会触发广泛支持的事件.您必须进行投票.某些浏览器支持 DOM突变事件，但从来没有已完全支持跨浏览器，请参阅链接页面上的警告.

No, there's no broadly-supported event fired when the class is updated. You'll have to poll. Some browsers support DOM mutation events, but it's never been completely supported cross-browser, see the warning on the linked page.

很显然，如果是您的代码更改了该类，则可以创建一个用于执行该操作的函数，并始终使用该函数而不是直接更改它，但是，如果您要在代码之外寻找对它的更改，除了轮询以外，我看不到其他任何方法.

Obviously, if it's your code that changes the class, you could create a function you use to do that and always use that function rather than changing it directly, but if you're looking for changes to it outside of your code, I don't see an alternative to polling.

如果进行轮询，请确保在所有目标浏览器上进行测试，并在轮询代码中实际完成尽可能少的工作.过度操作很容易(降低页面速度).

If you poll, be sure to test on all of your target browsers and do as little work actually in the polling code as you can. It's easy to over-do it (slowing down the page).

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