Shulou(Shulou.com)06/03 Report--

This article mainly explains "the limitation explanation and example usage of promise in javascript". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "the limited explanation and example usage of promise in javascript".

Limitation description

1. Promise has a limitation that it cannot stop the promise chain.

2. When an error occurs in a link in the promise chain, it is not necessary to continue to execute downward, but promise does not provide the original way to cancel.

We can see that even if an exception is thrown, the promise chain does not stop. Although we can use promise that returns the pending state to pause the promise chain.

Example

Const promise1 = new Promise ((resolve) = > {setTimeout (()) = > {resolve ('hello');}, 1000);}); promise1.then ((value) = > {throw new Error (' wrong!');}) .then (value = > {console.log (value);}, error= > {console.log (error.message); return result;}) .then () {console.log ('DJL's');}) At this point, I believe that you have a deeper understanding of the "limitation explanation and example usage of promise in javascript". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.