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文字

返回值:jQueryfilter(expr|obj|ele|fn)

概述

筛选出与指定表达式匹配的元素集合。

这个方法用于缩小匹配的范围。用逗号分隔多个表达式

参数

exprStringV1.0

字符串值,包含供匹配当前元素集合的选择器表达式。

jQuery objectobjectV1.0

现有的jQuery对象,以匹配当前的元素。

element ExpressionV1.4

一个用于匹配元素的DOM元素。

function(index) FunctionV1.4

一个函数用来作为测试元素的集合。它接受一个参数index,这是元素在jQuery集合的索引。在函数, this指的是当前的DOM元素。

示例

参数selector描述:

保留带有select类的元素

HTML 代码:
<p>Hello</p><p>Hello Again</p><p class="selected">And Again</p>
jQuery 代码:
$("p").filter(".selected")
结果:
[ <p class="selected">And Again</p> ]

参数selector描述:

保留第一个以及带有select类的元素

HTML 代码:
<p>Hello</p><p>Hello Again</p><p class="selected">And Again</p>
jQuery 代码:
$("p").filter(".selected, :first")
结果:
[ <p>Hello</p>, <p class="selected">And Again</p> ]

回调函数 描述:

保留子元素中不含有ol的元素。

HTML 代码:
<p><ol><li>Hello</li></ol></p><p>How are you?</p>
jQuery 代码:
$("p").filter(function(index) {
  return $("ol", this).length == 0;
});
结果:
[ <p>How are you?</p> ]
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