layer加载，成功关闭

//加载等待
        upload = layer.msg('加载中。。。', {
            icon: 16,
            shade: 0.2,
            time: false
        });
        $.ajax({
            type: "post",
            url: "${pageContext.request.contextPath}/C04/bomStandard",
            dataType: "json",
            data: {"workSheet": workSheet},
            async: true,
            success: function (data, status) {
                layer.close(upload);
              
            }
        });