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トップに関する質問Promise thenがうまくいかない

編集履歴

質問編集履歴

5

上方修正

2021/05/29 12:00

投稿

wergyt
wergyt

スコア6

title CHANGED
File without changes
body CHANGED
@@ -15,9 +15,6 @@
15
15
  .then((a) => console.log(a))
16
16
  .catch((a) => console.error(a));
17
17
 
18
- countdown(3)
19
- .then((a) => console.log(a))
20
- .catch((a) => console.error(a));
21
18
  ```
22
19
 
23
20
  これの結果は

4

上方修正

2021/05/29 12:00

投稿

wergyt
wergyt

スコア6

title CHANGED
File without changes
body CHANGED
@@ -1,4 +1,5 @@
1
+ ```
1
- ```function countdown(num) {
2
+ function countdown(num) {
2
3
  return new Promise((onFulfilled, onRejected) => {
3
4
  for (let i = num; i >= -1; i--) {
4
5
  setTimeout((i) => {

3

上方修正

2021/05/29 11:59

投稿

wergyt
wergyt

スコア6

title CHANGED
File without changes
body CHANGED
@@ -1,26 +1,4 @@
1
- ```function addtimeout(fn, period) {
2
- if (period === undefined) period = 1000;
3
- return function (...args) {
4
- return new Promise(function (onFulfilled, onRejected) {
5
- const timeoutId = setTimeout(
6
- onRejected,
7
- period,
8
- new Error("プロミス　タイムアウト")
9
- );
10
- fn(...args)
11
- .then(function (...args) {
12
- clearTimeout(timeoutId);
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- onFulfilled(...args);
14
- })
15
- .catch(function (...args) {
16
- clearTimeout(timeoutId);
17
- onRejected(...args);
18
- });
19
- });
20
- };
21
- }
22
-
23
- function countdown(num) {
1
+ ```function countdown(num) {
24
2
  return new Promise((onFulfilled, onRejected) => {
25
3
  for (let i = num; i >= -1; i--) {
26
4
  setTimeout((i) => {
@@ -35,6 +13,10 @@
35
13
  countdown(3)
36
14
  .then((a) => console.log(a))
37
15
  .catch((a) => console.error(a));
16
+
17
+ countdown(3)
18
+ .then((a) => console.log(a))
19
+ .catch((a) => console.error(a));
38
20
  ```
39
21
 
40
22
  これの結果は

2

上方修正

2021/05/29 11:59

投稿

wergyt
wergyt

スコア6

title CHANGED
File without changes
body CHANGED
@@ -1,4 +1,26 @@
1
+ ```function addtimeout(fn, period) {
2
+ if (period === undefined) period = 1000;
3
+ return function (...args) {
4
+ return new Promise(function (onFulfilled, onRejected) {
5
+ const timeoutId = setTimeout(
6
+ onRejected,
7
+ period,
8
+ new Error("プロミス　タイムアウト")
9
+ );
10
+ fn(...args)
11
+ .then(function (...args) {
12
+ clearTimeout(timeoutId);
13
+ onFulfilled(...args);
14
+ })
15
+ .catch(function (...args) {
16
+ clearTimeout(timeoutId);
17
+ onRejected(...args);
18
+ });
19
+ });
20
+ };
21
+ }
22
+
1
- ```function countdown(num) {
23
+ function countdown(num) {
2
24
  return new Promise((onFulfilled, onRejected) => {
3
25
  for (let i = num; i >= -1; i--) {
4
26
  setTimeout((i) => {

1

書式の改善

2021/05/29 11:56

投稿

wergyt
wergyt

スコア6

title CHANGED
File without changes
body CHANGED
@@ -1,4 +1,4 @@
1
- function countdown(num) {
1
+ ```function countdown(num) {
2
2
  return new Promise((onFulfilled, onRejected) => {
3
3
  for (let i = num; i >= -1; i--) {
4
4
  setTimeout((i) => {
@@ -13,6 +13,7 @@
13
13
  countdown(3)
14
14
  .then((a) => console.log(a))
15
15
  .catch((a) => console.error(a));
16
+ ```
16
17
 
17
18
  これの結果は
18
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  3