javascript - 在选择器中连接

Question

这个问题已经有答案了:

Which characters are valid in CSS class names/selectors? (11 个回答)

已关闭 6 年前。

我预计选择器将是 $("a.3")但事实并非如此。

var giftId = '3';
$("a."+giftId).click(function() {
    ...
});

我不能这样吗？

即使类名不是以数字开头，它仍然不会连接

<a class="gift6"...

    var giftId = '6'; 
    $("a.gift"+giftId).click(...

Answer 1

您不能拥有以数字开头的类，这可以解释为什么这不起作用。

https://www.w3.org/TR/CSS2/syndata.html#value-def-identifier

In CSS, identifiers (including element names, classes, and IDs in selectors) can contain only the characters [a-zA-Z0-9] and ISO 10646 characters U+00A0 and higher, plus the hyphen (-) and the underscore (_); they cannot start with a digit, two hyphens, or a hyphen followed by a digit. Identifiers can also contain escaped characters and any ISO 10646 character as a numeric code (see next item). For instance, the identifier "B&W?" may be written as "B\&W\?" or "B\26 W\3F".