addClass every nth

问题:

I have a list of elements that I want to style in 3 different ways.

I want every 3rd list item to have the same class throughout the whole list.

For example:

<li class="A">Some Content</li>
<li class="B">Some Content</li>
<li class="C">Some Content</li>
<li class="A">Some Content</li>
<li class="B">Some Content</li>
<li class="C">Some Content</li>
<li class="A">Some Content</li>
<li class="B">Some Content</li>
<li class="C">Some Content</li>

I can do 2 with :odd/even, but how to do it with 3?

回答1:

try

$("ul li:nth-child(3n+1)").addClass("A")
$("ul li:nth-child(3n+2)").addClass("B")
$("ul li:nth-child(3n)").addClass("C")

Feel free to consolidate it to make it prettier, but I wanted to expose the selectors.

回答2:

I recommend something like this:

var i = 0;
$("li").each(function() {
    var newClass = 'A';
    if (i % 3 == 1) newClass = 'B';
    if (i % 3 == 2) newClass = 'C';
    $(this).addClass(newClass);
});