Click on page elements page scroll up

//点击向下滚动页面
            var header = $("#header").height();
            var slider_container = $(".slider-container").height();
            var home_intro = $(".home-intro").height();
            var home_f1 = $(".home-f1").height();

            //Collaborate
            $(".home-collaborate").click(function() {
                var home_convenient_top = header + slider_container + home_intro + home_f1 + 40;
                $body = (window.opera) ? (document.compatMode == "CSS1Compat" ? $('html') : $('body')) : $('html,body');
                $body.animate({
                    scrollTop: home_convenient_top
                }, 500);
            });