Solving callback hell-The best Promise tutorial to understand-php.cn

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The best Promise tutorial to understand

Chapter1 Chapter One
1-1 callback hell
1-2 promise status
1-3 result of promise
1-4 parameters of then method
1-5 then method gets data
Chapter2 Chapter two
2-1 then method return value
2-2 Returns the status change of the instance
2-3 catch method
2-4 Solving callback hell
2-5 Optimize code

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