相关疑难解决方法(0)

这是问题(实时复制):

CSS:

div {
    border: 1px solid black;
}

HTML:

<div>.</div><br>
<div>.</div><br>
<div class="test">Should have a blue border</div><br>
<div>.</div><br>
<div>.</div><br>
<div>.</div><br>
<div>.</div><br>
<div>.</div><br>
<div>.</div><br>
<div>.</div><br>

JavaScript的:

$('div:last').css('border', '1px solid red')
    .prev('.test').css('border', '1px solid blue');

似乎当我$(selector).prev(.className)或$(selector).prev(tag.className)我得到一个空集.这有什么问题？