juqery 学习之四筛选过滤

2024-05-06 14:26:23

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eq(index)

获取第N个元素这个元素的位置是从0算起。Reduce the set of matched elements to a single element.The position of the element in the set of matched elements starts at 0 and goes to length - 1.

返回值

jQuery

参数

index (Integer) :元素在jQuery对象中的索引

示例

获取匹配的第二个元素

HTML 代码:

This is just a test. So is this

jQuery 代码:

$("p").eq(1)

结果:

[ So is this ]
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hasClass(class)

检查当前的元素是否含有某个特定的类，如果有，则返回true。这其实就是 is("." + class)。Checks the current selection against a class and returns true, if at least one element of the selection has the given class.This is an alternative to is("." + class).

返回值

Boolean

参数

class (String) : 用于匹配的类名

示例

给包含有某个类的元素进行一个动画。

HTML 代码:

jQuery 代码:

$("div").click(function(){
if ( $(this).hasClass("protected") )
    $(this)
      .animate({ left: -10 })
      .animate({ left: 10 })
      .animate({ left: -10 })
      .animate({ left: 10 })
      .animate({ left: 0 });
});
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filter(expr)

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Removes all elements from the set of matched elements that do not match the specified expression(s).This method is used to narrow down the results of a search. Provide a comma-separated list of expressions to apply multiple filters at once.