原生js隱藏和顯示滾動條

    //判斷滾動條是否存在
    function hasScrollbar() {
        return document.body.scrollHeight > (window.innerHeight || document.documentElement.clientHeight);
    }
    function hide_scroll(){
        $("html").height($(window).height()).css({
            "overflow-y": "hidden"
        });//彈出框時隱藏滾動條
        $("html").css("margin-right",17);//隱藏滾動條時防止頁面偏題
    }
    function show_scroll(){
        $("html").height($(window).height()).css({
            "overflow-y": "auto"
        });//彈出框時隱藏滾動條
        $("html").css("margin-right",0);//隱藏滾動條時防止頁面偏題
    }