js控制导航滚动

通过js获取视口高度，当超过高度时改变position的值为fixed，html在相应标签加入id= "float"

/**
 * Created by 刘吴江 on 2018/5/1.
 */
window.onload=
 ???function(){
 ???????var oDiv = document.getElementById("float"),
 ???????????H = 0,
 ???????????Y = oDiv
 ???????while (Y) {H += Y.offsetTop; Y = Y.offsetParent}
 ???????window.onscroll = function()
 ???????{
 ???????????var s = document.body.scrollTop || document.documentElement.scrollTop
 ???????????if(s>H) {
 ???????????????oDiv.style = "position:fixed;top:0;"
 ???????????} else {
 ???????????????oDiv.style = ""
 ???????????}
 ???????}
 ???}

js控制导航滚动

原文地址：https://www.cnblogs.com/liuwujiang/p/8978019.html