zepto下加载openbox弹出层

function fnOpenBox(objId,animateD,speed,tween,hide){
            var oOpenBox = $(objId);
            oOpenBox.show();
            oOpenBox.animate(animateD,speed,tween,function(){
                if(hide){
                    oOpenBox.hide();
                }
            });
        }

//btn click
        var oBtn = document.getElementById("btn1");
        oBtn.onclick = function(){
            fnOpenBox("#openbox1",{opacity:1,bottom:"0px"},300,"ease-out");
        }

        //close click
        var oBtn = document.getElementById("close1");
        oBtn.onclick = function(){
            fnOpenBox("#openbox1",{opacity:0,bottom:"-100%"},300,"ease-out",true);
        }