说明：   SI1 M-file for SI1.fig SI1, by itself, creates a new SI1 or raises the existing singleton*. J = SI1 returns the handle to a new SI1 or the handle to the existing singleton*. SI1( CALLBACK ,hObject,eventData,handles,...) calls the local function named CALLBACK in SI1.M with the given input arguments. SI1( Property , Value ,...) creates a new SI1 or raises the existing singleton*. Starting from the left, property value pairs are applied to the GUI before SI1_OpeningFunction gets called. An unrecognized property name or invalid value makes property application stop. All inputs are passed to SI1_OpeningFcn via varargin.