暂无数据，等待检测开始
Operation feedback: enable the users to clearly perceive their
operations by style updates and interactive effects;
Visual feedback: reflect current state by updating or rearranging
elements of the page.
Simplify the process: keep operating process simple and intuitive;
Definite and clear: enunciate your intentions clearly so that the
users can quickly understand and make decisions;
Easy to identify: the interface should be straightforward, which helps
the users to identify and frees them from memorizing and recalling.
Decision making: giving advices about operations is acceptable, but do
not make decisions for the users;
Controlled consequences: users should be granted the freedom to
operate, including canceling, aborting or terminating current
operation.