layer自定义内容高度调整,兼容弹窗高度

           var pageii = layer.open({
                type: 1,
                title:'最新系统公告',
                btn: '我知道了~',
                content: "<div style='margin:15px 15px;overflow-y:scroll;height:200px;' class='childdiv'></div>",
                anim: 'up',
                style: 'position:fixed;top:10%;bottom:10%;left:10%;right:10%; width:80%; height:80%; border: none; -webkit-animation-duration: .5s; animation-duration: .5s;'
            });
 
            var totalHeight = $('.layui-m-layerchild').height();   //弹窗高度
            var titleHeight = $('.layui-m-layerchild h3').height();  //标题高度
            var bodyHeight = totalHeight - titleHeight;
            $('.layui-m-layercont .childdiv').height(bodyHeight-50-30);
            $('.childdiv').append(result.data.gonggao);  //自定义内容高度