完整代码: 复制代码 代码如下: <BR>.highlight <BR>{ <BR>background-color: yellow; <BR>} <BR>.gray <BR>{ <BR>background-color: Gray; <BR>} <BR> Look: This is some text in a paragraph. This is a note about it. <BR>$("ul li").first().addClass('highlight'); <BR>jQuery("ul li").first().next().addClass('gray'); <BR>
