ancestor descendant
Selects all elements that are descendants of a given ancestor.
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1.0 新增ancestor descendant
ancestor (Selector) 任何有效的选择器。descendant (Selector) 用于筛选子孙元素的选择器。
A descendant of an element could be a child, grandchild, great-grandchild, and so on, of that element.
示例:
Finds all input descendants of forms.
<!DOCTYPE html>
<html>
<head>
<style>
body { font-size:14px; }
form { border:2px green solid; padding:2px; margin:0;
background:#efe; }
div { color:red; }
fieldset { margin:1px; padding:3px; }
</style>
<script src="jquery.min.js"></script>
</head>
<body>
<form>
<div>Form is surrounded by the green outline</div>
<label>Child:</label>
<input name="name" />
<fieldset>
<label>Grandchild:</label>
<input name="newsletter" />
</fieldset>
</form>
Sibling to form: <input name="none" />
<script>
$("form input").css("border", "2px dotted blue");
</script>
</body>
</html>