可以实现MATLAB环境中基本界面的制作，在该界面中求得矩形的面积，通过修改其长宽的相应值也可以得到不同的面积，最重要的是有默认选项来恢复到初始的设置值-MATLAB environment can be achieved in the production of the basic interface, and seek a rectangular area in the interface by modifying the length and width of the corresponding values can also get different area, the most important thing is the default option