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).sc
// // UIDemoViewController.m // 06-1UIScrollDemo // // Created by k on 14-9-4. // Copyright (c) 2014年 com.akleee.www. All rights reserved. // #import "UIDemoViewController.h" @interface UIDemoViewController ()<UIScrollViewDelegate> @proper