有开始、计时、停止三个按钮，一个文本框，按一次记录就在文本上输出持续的时间，再按一次记录就在文本下一行上输出持续的总时间，如此循环。同时启用键盘的回车键功能-There are start time, stop three buttons, a text box, according to a record output in the text on the duration of a record and then on the next line in the text output sustained total time, and so the cycle. At the same time, the opening keyboard ENTER key features