如何取消一个promise

function wrap(p) {
   let obj = {};
   let p1 = new Promise((resolve, reject) => {
      obj.resolve = resolve;
      obj.reject = reject;
    });
    obj.promise = Promise.race([p1, p]);
    return obj;
}

let promise = new Promise((resolve, reject) => {
   setTimeout(() => {
       resolve(123);
    }, 1000);
});

let obj = wrap(promise);
obj.promise.then(res => {
    console.log(res);
});
// obj.resolve("请求被拦截了");

1秒内主动调用obj.resolve，obj.promise方法就会被替换成自己的方法，而不会执行let promise的then方法