如何在 jQuery 中选择具有多个类的元素?

问题描述：

我想选择具有 a 和 b 两个类的所有元素.

I want to select all the elements that have the two classes a and b.

<element class="a b">

所以，只有具有两个类的元素.

So, only the elements that have both classes.

当我使用 $(".a, .b") 时，它给了我联合，但我想要交集.

When I use $(".a, .b") it gives me the union, but I want the intersection.

答

如果你只想匹配具有both 类的元素(一个交集，就像一个逻辑AND)，只需将选择器写在一起中间没有空格:

If you want to match only elements with both classes (an intersection, like a logical AND), just write the selectors together without spaces in between:

$('.a.b')

顺序不相关，所以你也可以交换类:

The order is not relevant, so you can also swap the classes:

$('.b.a')

因此，要将 ID 为 a 的 div 元素与 b 和 c 类匹配，您需要会写:

So to match a div element that has an ID of a with classes b and c, you would write:

$('div#a.b.c')

(实际上，您很可能不需要获得特定的信息，通常一个 ID 或类选择器本身就足够了:$('#a').)

(In practice, you most likely don't need to get that specific, and an ID or class selector by itself is usually enough: $('#a').)

如何在 jQuery 中选择具有多个类的元素?

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