CSS动态定位

$(document).ready(function(){
        $('body').on('click', '#start_timer', function() {
            var laydate = $(".layui-laydate");
            laydate.hide();
            if(laydate && laydate.length>){
                laydate.show();
                var top = $(".layui-layer")[].offsetTop;
                var left = $(".layui-layer")[].offsetLeft;
                var top1 = top + ;
                var left1 = left +  ;
                $(".layui-laydate").css("top",top1);
                $(".layui-laydate").css("left",left1);
            }
        })

        $('body').on('click', '#end_timer', function() {
            var laydate = $(".layui-laydate");
            laydate.hide();
            if(laydate && laydate.length>){
                laydate.show();
                var top = $(".layui-layer")[].offsetTop;
                var left = $(".layui-layer")[].offsetLeft;
                var top1 = top + ;
                var left1 = left +  ;
                $(".layui-laydate").css("top",top1);
                $(".layui-laydate").css("left",left1);
            }
        })
    });