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Singleton mode: It solves the problem of the number of instantiated objects, such as factories and object pools in abstract factories. Except Singleton, other creative modes solve the coupling relationship brought by new.To give a comprehensive example, you can look at it according to the above figure. According to the source channels of users, do targeted germination retention. For example, this source channel is a red envelope download from Android application market or a bonus game on WAP side, so this part of users can be considered as profit-seeking, and there can be corresponding profit-seeking activities on the landing page of the client, which can improve retention.However, due to the consideration of user experience, the website cannot add verification codes to all operations.4. Large investment, The density is too high when the water supply is not available, Misgurnus anguillicaudatus invested about 500 kg, Monopterus albus invested about 100 kg, and snails invested about 3,000 kg. These items were basically not sold back at all. The workers hired two, 6,000 a month. The reason was that they were too optimistic about the prospect, the workers did not pay attention, and they basically had to worry about themselves. Therefore, the breeding should be done slowly by their own family as far as possible, and people should be hired when the scale went up.Forget the Checklist of the code review, walk to your colleague's seat, ask him to sit in front of your computer like Master, then spend 5 minutes telling him about your code, and give him another 5 minutes to give him advice on your code. This is better than anything else. And if you use a Checklist to make this matter very formal, one of the following two things will happen:板栗和小葱明知道爹娘在鼓励开导他们，也不禁被激得眼含热泪，热血奔涌。范文轲露出几分深沉，奸笑道：依项羽和尹旭的性情，令尹你停滞不行，他们一定坐不住。