密码锁.密码锁大体功能如下：用户有3次输入密码的机会，如果正确，则开锁；如果3次都输入错误，密码锁将报警并进入锁定状态，用户在较长的一段时间内不能再输入密码，警报时间过后，密码锁重新回到等待状态，用户可以再次输入密码-Locks. Password lock generally functions as follows: The user has the opportunity to enter a password 3 times, if correct, then the unlocking password lock the alarm　3 times are input errors, and enter a locked state within a longer period of time, the user can no longer enter a password, after the alarm time, the password lock back to the wait state, the user can enter the password again