div 实现上拉固定在顶部_div上拉

 //导航上拉固定
        var scro
        navdaohan = function (id, obj) {
            console.log("开启监听置顶")
            var obj = document.getElementById(id)
            var T = obj.offsetTop;
            while (obj = obj.offsetParent) {
                T += obj.offsetTop;
            }
            scro = T
        }
        navscriogundon = function (id, scro) {
            var obj = document.getElementById(id)
            var scrotop = document.documentElement.scrollTop || document.body.scrollTop
            if (scrotop > scro - 120) {
                obj.style.position = "fixed"
                obj.style.top = "120px"
                var czid = document.getElementById('tmdtid')
                if (!czid) {
                    var div = document.createElement('div')
                    div.style.height = "201px"
                    div.id = "tmdtid"
                    $("#like_shop").prepend(div)
                }
            } else {
                obj.style.position = "relative"
                obj.style.top = "0"
                $("#tmdtid").remove()
            }
        }
        navdaohan("tm_shousuo_nav")
        
        window.onscroll = function () {           
            navscriogundon("tm_shousuo_nav", scro)

        }
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