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promise中断

function wrap(p1){       let abort;    let p2 = new Promise((resolve,reject)=>{           abort = function(){               reject('失败');        }    });    let p =  Promise.race([p1,p2]);    p.abort = abort;    return p;}let p = wrap(new Promise((resolve,reject)=>{       setTimeout(() => {           resolve();      }, 3000);}))p.then(()=>{   },()=>{   console.log('失败')})p.abort();

// 1let p = new Promise((resolve,reject)=>{       reject();    resolve();});p.then(()=>console.log('成功'),()=>console.log('失败'));//失败

const promise = new Promise((resolve,reject)=>{       console.log(1);    resolve();    console.log(2);})promise.then(()=>{       console.log(3);})//1//2//3

Promise.resolve(1).then(res=>2).catch(err=>3).then(res=>console.log(res));//2

Promise.resolve(1).then(x=>x+1).then(x=>{   throw new Error('My Error')}).catch(()=>1).then(x=>x+1).then(x=>console.log(x)).catch(console.error)//2