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Promise.race learning (judging the fastest execution of multiple promise objects)

2022-08-11 06:34:00 【Chen Yangyu】

Promise.race learning

 <script>/* Promise.race learning 1. Syntax: Promise.race (an array containing multiple Promise objects) 2. Return a new Promise object and change the object to be the first state to complete the PromiseNote: Here you can adjust the delay of setTimeout to experiment with Promise.race */var a =new Promise((resolve,reject)=>{setTimeout(() => {resolve("2s");}, 2000);})var b =new Promise((resolve,reject)=>{setTimeout(() => {reject('1s')}, 3000);})var race=Promise.race([a,b])console.log(race)</script>