Can'；找不到合适的xpath目录。需要一些建议吗

为了找到上面节点的正确xpath，我使用$x（“//ul[@id='DateList']//”），但仍然收到一条消息，表示表达式是非法的

<div class="bx-wrapper" style="max-width: 870px; margin: 0px auto;">
<div class="bx-viewport" style="width: 100%; overflow: hidden; position: relative; height: 0px;">
<div class="bx-wrapper" style="max-width: 870px; margin: 0px auto;">
<div class="bx-viewport" style="width: 100%; overflow: hidden; position: relative; height: 91px;">
<ul id="DateList" class="bxslider clearfix" data-bx-slider="mode: 'horizontal', pager: false, controls: false, minSlides: 1, maxSlides:4, slideWidth: 290, slideMargin:0, hideControlOnEnd:true, infiniteLoop: false, moveSlides: 1" style="width: 515%; position: relative; transition-duration: 0s; transform: translate3d(0px, 0px, 0px);">

2015

在这两种情况下，最后一个双斜杠太多：正确的XPath是：

• //div[@class='dates']

• //ul[@id='DateList']

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xpath表达式中的双斜杠表示“在文档的任何位置”。

如果我想继续在corse中构建更深层次的xpath，我可以使用双斜杠吗？但是双斜杠作为简单斜杠，必须优先于任何其他xpath选择器：节点选择器、属性选择器。。。因此，它不能位于xpath的末尾。

<div class="bx-wrapper" style="max-width: 870px; margin: 0px auto;">
<div class="bx-viewport" style="width: 100%; overflow: hidden; position: relative; height: 0px;">
<div class="bx-wrapper" style="max-width: 870px; margin: 0px auto;">
<div class="bx-viewport" style="width: 100%; overflow: hidden; position: relative; height: 91px;">
<ul id="DateList" class="bxslider clearfix" data-bx-slider="mode: 'horizontal', pager: false, controls: false, minSlides: 1, maxSlides:4, slideWidth: 290, slideMargin:0, hideControlOnEnd:true, infiniteLoop: false, moveSlides: 1" style="width: 515%; position: relative; transition-duration: 0s; transform: translate3d(0px, 0px, 0px);">

<li class="date-block slide ng-scope" data-notify-when-repeat-finished="" ng-repeat="dates in cruiseFinder.filters.sailDates" style="float: left; list-style: outside none none; position: relative; width: 290px;">
<h5 class="ng-binding">2015</h5>
<ul id="months" class="months">