问题:
I have async function in async function. In the second I must wait when promises resolve or reject and after run other code below. But if promise reject my code stopping an...
可以将文章内容翻译成中文,广告屏蔽插件会导致该功能失效:
问题:
I have async function in async function. In the second I must wait when promises resolve or reject and after run other code below. But if promise reject my code stopping and no run other functions. How I can fix it?
await axios.all(promises).then(res => {
axios.patch("/url", { foo: bar }).then(async () => {
const promises2 = arr.map(item => {
return axios.post("/url-2", item)
});
await Promise.all(promises2)
.then(() => console.log("resolved")) //this not calling ever
.catch(() => console.log("failed")) //this not calling ever
console.log("This console log ever not working")
})
})
回答1:
Promises aren't chained properly, axios.patch(...)
promise isn't returned. await
is syntactic sugar for then
and catch
, its purpose is to get rid of nested functions where possible. It should be:
const res = await axios.all(promises)
await axios.patch("/url", { foo: bar })
const promises2 = arr.map(item => {
return axios.post("/url-2", item)
});
try {
await Promise.all(promises2)
console.log("resolved"))
} catch (err) {
console.log("failed");
}
回答2:
The order of your code is wrong. Of course if the first promise is rejected, then the rest will not be called.
Try rewriting your code this way:
let res = await axios.all(promises).catch(() => { console.log("failed"); return false; });
if (!res) {
// Do something when rejected
....
}
// Call the 2nd promise
let res2 = await axios.path("/url", {foo: bar}).catch(() => {console.log("failed 2"); return false; });
if (!res2) {
// Do something when the 2nd promise is rejected
...
}
// Call your last promise
let res3 = await Promise.all(promises2).catch(() => {console.log("failed 3"); return false; });
if (!res3) {
// Do something if it is rejected again
....
}
// Otherwise, do your thing
回答3:
Try this code, it should pinpoint where the error or rejection is occurring (i.e. it's definitely before Promise.all(promises2)
is run
await axios.all(promises)
.then(res => axios.patch("/url", { foo: bar }), err => {
throw `all(promises) failed with ${err}`;
})
.then(() => {
const promises2 = arr.map(item => {
return axios.post("/url-2", item);
});
return Promise.all(promises2)
.then(() => console.log("resolved")) //this not calling ever
.catch(err => {
throw `all(promises2) failed with ${err}`;
});
}, err => {
throw `patch failed with ${err}`;
})
.catch(err => console.error(err));
Note I've removed async/await, because in the code you've posted it is totally unnecessary