带图标的ListView

只能在循环体外部定义，如果不想将z暴露在循环体外，可以用{}包住两个循环体，并在{}中定义z

An interface type specifies a method set called its interface. Avariable of interface type can store a value of any type with a methodset that is any superset of the interface. Such a type is said toimplement the interface. The value of an uniniti...