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Assuming that module a is loaded first, after module a is loaded, bar indirectly points to bar in module b. Whether loading completed imports or incomplete imports, there is an indirect connection between imports and exports, so it always works properly.晌午时分，黎水和林聪值守归来，在树林里挖了不少蝉蛹。Although the above code can meet the requirements, it is not easy to expand and difficult to read. If I want one or two conditions in the future, if I want to recharge 300 yuan successfully, I can win the 150 yuan red envelope, then I have to change the code inside at this time, so the coupling between business logic and code is relatively high, and I accidentally correct the wrong code. At this time, we try to use the responsibility chain mode to transfer objects in turn to realize it.Warm Tip: WeChat searches or scans the two-dimensional code below, pays attention to the Shanghai local treasure WeChat public number (shbendibao), and replies to 38 in the input box. You can inquire about 38 more preferential welfare activities such as Shanghai scenic spots, shopping mall discounts, health check-ups, etc. Happy holidays to divines!