CSS嵌套列出项目和备用背景 [英] CSS Nested lists items and alternate background

问题描述

我正在寻找一种方式让列表项具有交替的背景颜色。当存在嵌套列表时，项目保持交替，但是子项缩进，而没有父流的背景颜色到其嵌套的子项。

I am searching for a way to have list items have alternating background colors. When there is a nested list the items keep alternating but the child is indented without having the background color of the parent flow down to its nested children.

无法应用类。项目的数量也是可变的。优选地，它应该工作于无限量的嵌套列表。但如果不可能，3个深度（如图所示）的帽子就足够了。如果使用div而不是li和ul更容易做到，这对我也是可能的。我更喜欢纯HTML / CSS。

It is not possible to apply classes. Also the amount of items is variable. Preferably it should work for an infinite amount of nested lists. But if that is not possible a cap on 3 depths (as in picture) should be enough. If it is easier to do by using divs instead of li and ul, that is also possible for me. I prefer pure HTML/CSS.

因为我的所有实验没有好处，我只能提供一个JSFiddle的嵌套列表。

Because all my experiments did no good I can only supply a JSFiddle with the nested lists.

https://jsfiddle.net/qmdwpzt8/1/

<ul>
<li>Item 1
    <ul>
        <li>Item 1-1</li>
        <li>Item 1-2
            <ul>
                <li>Item 1-2-1</li>
                <li>Item 1-2-2</li>
            </ul>
        </li>
        <li>Item 1-3</li>
    </ul>
</li>
<li>Item 2
    <ul>
        <li>Item 2-1
            <ul>
                <li>Item 2-1-1</li>
            </ul>
        </li>
    </ul>    
</li>
<li>Item 3</li>
<li>Item 4</li>
</ul>

推荐答案

这里有一个可能的解决方案： https://jsfiddle.net/qmdwpzt8/3/

Here is one potential solution: https://jsfiddle.net/qmdwpzt8/3/

不确定是否满足您的所有要求，但我使用 div 更新您的列表：

Not sure if all your requirements will be met by it, but I updated your list with div's:

<ul>
    <li><div>Item 1</div>
        <ul>
            <li><div>Item 1-1</div></li>
            <li><div>Item 1-2</div>
                <ul>
                    <li><div>Item 1-2-1</div></li>
                    <li><div>Item 1-2-2</div></li>
                </ul>
            </li>
            <li><div>Item 1-3</div></li>
        </ul>
    </li>
    <li><div>Item 2</div>
        <ul>
            <li><div>Item 2-1</div>
                <ul>
                    <li><div>Item 2-1-1</div></li>
                </ul>
            </li>
        </ul>    
    </li>
    <li><div>Item 3</div></li>
    <li><div>Item 4</div></li>
</ul>

然后使用jQuery添加背景颜色：

And then add background colors with jQuery:

$( document ).ready(function() {
    var b = true;
    $( "div" ).each(function( index ) {
        b = !b;
        if (b) {
            $(this).css("background-color", "#ff0000");
        } else {
            $(this).css("background-color", "#00ff00");
        }            
    });
});

这取决于jQuery / Javascript。

This does depend on jQuery/Javascript.

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