var p3 = new Promise( (resolve, reject) => { resolve('B') }) var p1 = new Promise( (resolve, reject) => { resolve(p3) }) p2 = new Promise( (resolve, reject) => { resolve('A') }) p1.then(v => console.log(v)) p2.then(v => console.log(v))

node is inconsistent with the browser operation. It is normal to understand that p1 resolves a promise internally and is not synchronous, so it is obviously later than p2.