用于自定义对象显示的特定方法

You can customize object display based on the state of the object and you can change different parts of the display.

Change the order and number of properties displayed for an object of your class.

Customize each of the three parts of the display — header, property groups, and footer.

Customize the display of scalar objects.

Customize the display of nonscalar objects, including empty object arrays.

You can call only sealed methods on nonscalar heterogeneous arrays.

Overloading the disp function provide limited display customization.