a lot
1. Promise implementation principle
2. Communication between vue components
3. Performance optimization
4. Vuex data flow process
5. Talk about css preprocessor mechanism
6. Algorithm: Promise serial
A certain movie
1. Communication between vue components
2. Difference between react and vue update mechanism 3.
Pros and cons of Vue3 proxy
4. Performance optimization
5. Symbol application
6. Deep copy
question
- Promise implementation principle
A solution to solving asynchronous programming callback hell (the traditional way to solve asynchronous programming is through callback functions, and too much nesting of callbacks will lead to callback hell (callback hell)), which can be expressed in a synchronous way through Promise, so that Solve the problem of code bloat and poor readability.
The program has three states: pending (waiting), resolved (success), and rejected (failure).
The instance of Promise can be regarded as a state displayer. We can realize the business with state and change state through Promise, and then combine the async function to further improve the readability and maintainability of the program
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