定义一个计时器类，对计时器对象初始化就是给其数据成员赋初值表示秒数。在创建对象时，构造函数传递的参数可以是一个整数、一个数字串、两个参数（秒数和分钟数，转换成总秒数），也可以不带参数，使初始值为0。-Timer to define a category on the timer object is initialized to its initial value data member, said the number of seconds given. In the creation of the object, the constructor parameters of transmission can be an integer, a number of strings, the two parameters (the number of seconds and minutes, convert the total number of seconds), it may not take parameters, so that the initial value of 0.