Web front-end Promise tutorial from entry to mastery

• Chapter1 Introduction
• 1-1 Promise video introduction
• 1-2 Introduction to Promises
• Chapter2 First Experience
• 2-1 First experience with Promise 01
• 2-2 First experience with Promise 02
• Chapter3 Practical exercises
• 3-1 fs read file
• 3-2 ajax request
• 3-3 Encapsulate fs reading file operation
• 3-4 The promisify method performs promise style conversion
• 3-5 Promise encapsulates AJAX requests
• Chapter4 Object properties
• 4-1 Introduction to object status attributes
• 4-2 Introduction to object result value attributes
• Chapter5 work process
• 5-1 Promise workflow
• 5-2 Promise API-constructor-then-catch
• 5-3 Promise.resolve method
• 5-4 Promise.reject method
• 5-5 Promise.all methods
• 5-6 Promise.race method
• Chapter6 Promise key issues
• 6-1 How to modify the state of an object
• 6-2 Can multiple callbacks be executed?
• 6-3 Issues with the order of changing status and specifying callbacks
• 6-4 What determines the result returned by the then method?
• 6-5 Chain multiple tasks
• 6-6 abnormal penetration
• 6-7 How to terminate a promise chain
• Chapter7 Promise custom packaging
• 7-1 Initial structure building
• 7-2 Resolve and regect structure construction
• 7-3 resolve and regect code implementation
• 7-4 Thtow throws exception to change state
• 7-5 The state of a Promise object can only be modified once
• 7-6 then method executes callback
• 7-7 Execution of asynchronous task callbacks
• 7-8 Specify multiple callback implementations
• 7-9 Synchronously modify the status then method result return
• 7-10 Asynchronously modify the status then method result return
• 7-11 then method improvement and optimization
• 7-12 catch method - exception penetration and value passing
• 7-13 resolve method encapsulation
• 7-14 reject method encapsulation
• 7-15 all method encapsulation
• 7-16 race method encapsulation
• 7-17 Asynchronous execution of then method callback
• 7-18 Implementation of class version
• Chapter8 async function
• 8-1 async function
• 8-2 await expression
• 8-3 Combining async and await in practice
• 8-4 async and await combined to send ajax request