jQuery-只做一次 [英] jQuery - Do only once

问题描述

我想检查一个元素是否具有.active类，如果它确实添加了:margin-top:4px;

I want to check if an element has the class .active, if it does add: margin-top: 4px;

但是我只希望这种情况一次一次，在页面加载时，一旦检测到该类，我就不想再次检测到它并添加CSS样式.

However I only want this to occur once, when the page loads, once the class has been detected I don't want to detect it again and add the CSS style.

当某些元素悬停在该类上时，将应用此类.

This class is applied when certain elements are hovered over.

在jQuery中这可能吗?

Is this possible in jQuery?

推荐答案

查看一个事件.记录的示例:

Check out the one event. Documented example:

$('#foo').one('click', function() {
  alert('This will be displayed only once.');
});

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