h5软键盘弹出顶起页面布局问题解决

窗口改变时设置定位属性，窗口再次改变回来的时候要把定位属性去掉

<script>
    var oHeight = $(document).height();
    $(window).resize(function(){
        if($(document).height() < oHeight){
            $('#footer').css("position","static");
        }else{
            $('#footer').css("position","");
        }
    })
</script>