$('frame_left').select('.pro_nav li')[3].addClassName('cur');表示获取 id 为 frame_left 的元素下的 某个class为pro_nav的下面的第4个li元素
添加 class 为 cur
详细解决方案
依据ID，class 选择元素
热度：197 发布时间：2012-10-29 10:03:53.0
表示获取 id 为 frame_left 的元素下的 某个class为pro_nav的下面的第4个li元素
添加 class 为 cur
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