模拟用户名和密码输入过程，在一个文本框中输入字符串回车后，标题改为本文本；在密码框中输入密码以后，密码显示到第一个文本框。-Simulate the user name and password input process, in a text box, enter a carriage return after the string, change the title of this article　in the Password box, type the password, the password displayed to the first text box.