Day95:Promise.all中任何一个Promise出现错误的时候都会执行reject,导致其它正常返回的数据也无法使用。你有什么解决办法么?
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Genzhen commented
Day95:Promise.all中任何一个Promise出现错误的时候都会执行reject,导致其它正常返回的数据也无法使用。你有什么解决办法么?
Genzhen commented
每日一题会在下午四点在交流群集中讨论,五点 Github、交流群同步更新答案
1)在单个的catch中对失败的promise请求做处理
2)把reject操作换成 resolve(new Error("自定义的error"))
3)引入Promise.allSettled
const promises = [
fetch('/api1'),
fetch('/api2'),
fetch('/api3'),
];
Promise.allSettled(promises).
then((results) => results.forEach((result) => console.log(result.status)));
// "fulfilled"
// "fulfilled"
// "rejected"
4)安装第三方库 promise-transaction
// 它是promise事物实现 不仅仅能处理错误还能回滚
import Transaction from 'promise-transaction';
const t = new Transaction([
{
name: 'seed',
perform: () => Promise.resolve(3),
rollback: () => false,
retries: 1, // optionally you can define how many retries you like to run if initial attemp fails for this step
},
{
name: 'square',
perform: (context) => {
return Promise.resolve(context.data.seed * context.data.seed);
},
rollback: () => false,
},
]);
return t.process().then((result) => {
console.log(result); // should be value of 9 = 3 x 3
});