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Canvas add base64 picture 
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"Because once a great revolution succeeds, the reason for the revolution disappears, and the revolution becomes incomprehensible because of its own success." - Tocqueville, The Old System and the Great Revolution 
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How to judge which vitamin you lack? 
Dry eyes: lack of vitamin A, carotene, bad breath: lack of vitamin B6, zinc, weak teeth: lack of vitamin A, calcium, dry lips, peeling: lack of vitamin A B2 Anemia, cold hands and feet: vitamin B6 deficiency, iron folate fatigue, poor energy: vitamin B1 deficiency B2, B6, excessive hair loss, excessive dandruff: lack of vitamin A B6、 Zinc -
Disappointment of human nature. 
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The small fox crosses the water and its tail is polluted -
Everyone's joys and sorrows are different 
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People who live by their relatives, people who are rich by what they want, people who live by what they do, people who are poor by what they don't do, people who are poor by what they don't take 
He regards his relatives as his relatives, the rich as his friends, the rich as his deeds, the poor as his inaction, the poor as his inaction, the rich as his contacts, the prominent as his recommendations, the poor as what he does not do, and the poor as what he does not take. -
IOS multi open detection, anti multi open detection, anti anti multi open detection 
Generally, the way to get the bid is NSBundle.mainBundle.bundleIdentifier; [NSBundle.mainBundle objectForInfoDictionaryKey:@"CFBundleIdentifier"… -
Pod simulator header file not found 
https://www.crifan.com/xcode_9_ream_h_file_not_found_with_angled_include_use_quotes_instead/ Modify Header Search Path Add $( -
About the problem that the page in the iframe cannot set cookies (sessions) The reason is that the default value of SameSite in the browser is Lax. See https://www.ruanyifeng.com/blog/2019/09/cookie-samesite.html Try the following methods respectively: 1. Directly set the php code