parent > child

选择所有在 父元素 "parent" 下面直接的子元素，并且要匹配 "child" 里的选择器。

As a CSS selector, the child combinator is supported by all modern web browsers including Safari, Firefox, Opera, Chrome, and Internet Explorer 7 and above, but notably not by Internet Explorer versions 6 and below. However, in jQuery, this selector (along with all others) works across all supported browsers, including IE6.

The child combinator (E > F) can be thought of as a more specific form of the descendant combinator (E F) in that it selects only first-level descendants.

示例:

Places a border around all list items that are children of <ul class="topnav"> .

<!DOCTYPE html>
<html>
<head>
<style>
body { font-size:14px; }
</style>
<script src="jquery.min.js"></script>
</head>
<body>


                    
<ul class="topnav">
    <li>Item 1</li>
    <li>Item 2 
        <ul><li>Nested item 1</li><li>Nested item 2</li><li>Nested item 3</li></ul>
       </li>
    <li>Item 3</li>
</ul>


<script>

$("ul.topnav > li").css("border", "3px double red");

</script>
</body>
</html>
演示: