说明：  IDL程序进度条在进行数据处理时，经常要设计运行时间很长的程序，这样运行起来往往让人没有底。这是IDL进度条程序，调用非常简单，只要在循环体内加一调语句调用本函数即可实现。
(IDL procedures for data processing during the progress bar, often a very long time to design the program to run, so people often do not end up running. This is a progress bar IDL program, called very simple, as long as the body of the loop plus a transfer statement calling this function can be realized.)