注意从数组中拿数据传输，地址传递造成的原数据污染！
自定义对象的深拷贝要实现NSCoping方法。
@interface CustomerListCellInfoObject : NSObject <NSCopying>
//自定义对象的深拷贝
-(id)copyWithZone:(NSZone *)zone
{
CustomerListCellInfoObject *customer = [[[self class] allocWithZone:zone]init];
customer.cname = self.cname;
customer.ctel1 = self.ctel1;
customer.ctel2 = self.ctel2;
customer.attitude = self.attitude;
customer.icon = self.icon;
customer.lid = self.lid;
customer.cnameFirstChat = self.cnameFirstChat;
return customer;
}
