相关疑难解决方法(0)

我有3个具有相同类的div,我在点击时将"选择"类添加到NEXT DIV并从之前的类中删除它,它工作正常但我想循环它

目前它从1 - > 2 - > 3,我希望它循环,3 - > 1,请帮助...

HTML

<div id="all">
<div class="section selected">ONE</div>
<div class="section">TWO</div>
<div class="section">THREE</div>
</div>
<br />
<a href="javascript:;" id="button">CLICK</a>

CSS

.selected{background:red}

JS

$('#button').click(function(){
    $('.section.selected').removeClass('selected').next('.section').addClass('selected'); 
});

JS Fiddle Link:http://jsfiddle.net/madhuri2987/KK66g/2/

级联是使CSS特别强大的原因.但在媒体查询的情况下,重叠可似乎有问题.

考虑以下CSS(CSS媒体查询重叠的连续规则):

/* Standard - for all screens below 20em */

body { color: black; font-size: 1em; }

/* Query A - slightly wider, mobile viewport */

@media (min-width: 20em) and (max-width: 45em) {
    body { color: red; } /* supposed to be unique for this width */
}

/* Query B - everything else */

@media (min-width: 45em) {
    body { font-size: larger; } /* because viewport is bigger */
}

因此,当屏幕正好是45em宽时,45em处的重叠将 …