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문자

返回值:jQueryaddClass(class|fn)

概述

为每个匹配的元素添加指定的类名。

参数

classStringV1.0

一个或多个要添加到元素中的CSS类名,请用空格分开

function(index, class)FunctionV1.4

此函数必须返回一个或多个空格分隔的class名。接受两个参数,index参数为对象在这个集合中的索引值,class参数为这个对象原先的class属性值。

示例

参数class 描述:

为匹配的元素加上 'selected' 类

jQuery 代码:
$("p").addClass("selected");
$("p").addClass("selected1 selected2");

回调函数 描述:

给li加上不同的class

HTML 代码:
<ul>
      <li>Hello</li>
      <li>Hello</li>
      <li>Hello</li>
</ul>
jQuery 代码:
$('ul li:last').addClass(function() {
  return 'item-' + $(this).index();
});
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