`a>是什么b是什么意思? [英] What does `a > b` mean?

问题描述

我正在阅读有关使用jquery，php和ajax创建shoutbox的教程.在jquery代码中，它会创建一个像这样的变量

I'm reading a tutorial about creating a shoutbox with jquery, php and ajax. In the jquery code, it creates a variable like this

var messageList = $(".content > ul");

html中有一个内容"类，并且其中有一个无序列表.但是我不了解变量创建中的语法.content > ul.

There is a "content" class in the html, and it has an unordered list in it. But I don't understand the syntax .content > ul in the creation of the variable.

你能解释吗?

HTML

 <div class="content">  
            <h1>Latest Messages</h1>  
            <div id="loading"><img src="css/images/loading.gif" alt="Loading..." /></div>  
            <ul>  
            <ul>  
        </div>  

推荐答案

它将搜索ul是.content的 direct 子级，因此如果将html更改为

It searches for a ul that's the direct child of .content, so if you'd change the html to

<div class="content">
   <div>
      <ul></ul>
   </div>
</div>

您的选择器不会返回任何内容.有关 http://api.jquery.com/category/selectors/

your selector wouldn't return anything. There's more info on all kinds of selectors on http://api.jquery.com/category/selectors/

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