jQuery.nav.js插件代码: /* * jQuery One Page Nav Plugin * http://github.com/davist11/jQuery-One-Page-Nav * * Copyright (c) 2010 Trevor Davis (http://trevordavis.net) * Dual licensed under the MIT and GPL licenses. * Uses the same license as jQuery, see: *
获取元素(这里定位元素A)距离顶部的高度,接着设定scroll滚动的事件,比如超过那个高度,把A的位置设定为fixed,小于该高度,修改回relative. 方法一: $(function() { var elm = $('.nav'); var startPos = $(elm).offset().top; $.event.add(window, "scroll", function() { var p = $(window).scrollTop(); $(elm).css('pos