Promise.resolve的参数是thenable时为什么不调用后面的then?

Question

Promise.resolve() .then( value => {    console.log(0);    return Promise.resolve({         then() {            console.log(1);         }     }) }) .then( value => {         return Promise.resolve({         then() {           console.log(2);         }     }) }) .catch(()=>{   console.log('not yet'); })

Answer 1

MDN promise thenable
thenable是这样用的

Promise.resolve({
  then(resolve) {    console.log(1);
    resolve(2)
  }
}).then(v=>{  console.log(v) //2})