监听导航滚动置顶

监听导航滚动置顶

1.js代码

/** * Created by EDUASK on 2016/5/20. */$(function(){ //引入id标签; var navtive=$("#native"); //设置导航标签为置顶; var offsetTop=navtive.offset()-; //定义一个监听高度; var scrollHeight=$(document).scrollTop; fn(navtive,offsetTop); //设置监听事件; $(window).scroll(function(){ fn(navtive,offsetTop); }); //调用方法; function fn(navtive,offsetTop){ var scrollHeight=$(document).scrollTop(); if(offsetTop>scrollHeight){ navtive.css("top",offsetTop); }else{ navtive.css("top",scrollHeight); } }});

2.html代码

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