:only-child Selector
only-child selector
version added: 1.1.4jQuery(':only-child')
描述： 選擇所有其父元素下只有一個子元素的元素。
若家長有其他子元素，就不會被匹配。
Example:
Finds the button with no siblings in each matched div and modifies look.
<!DOCTYPE html>
<html>
<head>
<style>
div { width:100px; height:80px; margin:5px; float:left; background:#b9e }
</style>
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
</head>
<body>
<div>
<button>Sibling!</button>
<button>Sibling!</button>
</div>
<div>
<button>Sibling!</button>
</div>
<div>
None
</div>
<div>
<button>Sibling!</button>
<button>Sibling!</button>
<button>Sibling!</button>
</div>
<div>
<button>Sibling!</button>
</div>
<script>$("div button:only-child").text("Alone").css("border", "2px blue solid");</script>
</body>
</html>Demo:
Result:
[ <li>Glen</li> ]