安卓鍵盤彈出底部被頂起

 //安卓鍵盤彈出底部被頂起
        var oHeight = $(document).height();
        $(window).resize(function(){ //ios軟鍵盤彈出不會觸發resize事件
            if($(document).height() < oHeight){
                $(".signIn_footer").css("position","static");
            }else{
                $(".signIn_footer").css("position","absolute");
            }
        });