Mainly the difference between then methods
A is relatively easy to read. I still don’t understand the es6 specification about then. It seems that the return value of the callback function is not classified and processed
This is just one of the doubts. Is there any pioneer who can explain the comprehensive differences in detail?
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
I don’t quite understand what the poster wants to ask
I understand yes
Promise/A+ is one of the specifications of Promise, and for specific use, browsers, node, and JS libraries need to implement corresponding functions according to this specification.
ES6’s Promise is an implementation of the Promise/A+ specification, and some additional simple methods such as Promise.all and Promise.race are added based on the specification implementation
Similarly, existing JS libraries such as
es6-promise,bluebridalso implement the Promise/A+ specification