- (void)setName:(NSString *)name
{
if (_name != name) {
[_name release];
_name = [name copy];
}
}这一块为什么要用 [_name release]; 字符串的计数器数值那么大，加一个release有啥用？

- (void)setName:(NSString *)name
{
if (_name != name) {
[_name release];
_name = [name copy];
}
}这一块为什么要用 [_name release]; 字符串的计数器数值那么大，加一个release有啥用？