安卓键盘弹出底部被顶起

 //安卓键盘弹出底部被顶起
        var oHeight = $(document).height();
        $(window).resize(function(){ //ios软键盘弹出不会触发resize事件
            if($(document).height() < oHeight){
                $(".signIn_footer").css("position","static");
            }else{
                $(".signIn_footer").css("position","absolute");
            }
        });