Jquery Div Scroll to top of browser position fixed

Gets the element (here positioned element a) from the top of the height, and then sets the scroll scrolling event, such as exceeding that height, the position of a is set to fixed, less than the height, modified back to relative.

Method One:

$ (function() {     var elm = $ ('. Nav ');      var startpos = $ (elm). Offset (). Top;      function () {         var p = $ (window). scrolltop ();         $ (Elm). css (' position ', ((P) > Startpos)? ' Fixed ': ' Static ');         $ (Elm). CSS (' Top ', ((P) > Startpos)? ' 0px ': ');     

Method Two:

$(function(){//gets the distance to locate the element from the top of the browservarNAVH = $ (". Nav")). Offset (). Top;//scroll bar Events$ (window). Scroll (function(){//get the sliding distance of the scroll barvarScroh = $ ( This). scrolltop ();//the sliding distance of the scrollbar is greater than or equal to the distance of the anchor element from the top of the browser, fixed, and not fixedif(scroh>=NAVH) {$(". Nav"). css ({"Position": "Fixed", "top": 0});}Else if(SCROH
    ". Nav"). css ({"position": "Static"});}})})

Cases:

Article from: http://blog.sina.com.cn/s/blog_3eba8f1c0101k94s.html

Jquery Div Scroll to top of browser position fixed