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
