Revision of test.ts

1 file changed, 54 insertions

test.ts(vytvořil soubor)

		@@ -0,0 +1,54 @@
1	+	const _cache = {}
2	+	const _loading = {}
3	+
4	+	async function simulateFetch(url) {
5	+	return new Promise((resolve, reject) => {
6	+	setTimeout(() => {
7	+	resolve(`Response from ${url}`)
8	+	}, 1000) // 模拟延迟1秒的请求
9	+	})
10	+	}
11	+
12	+	async function fetchWithCache(url) {
13	+	if (url in _cache)
14	+	return _cache[url]
15	+
16	+	if (!_loading[url]) {
17	+	_loading[url] = true
18	+	const request = simulateFetch(url)
19	+	.then((text) => {
20	+	_cache[url] = text
21	+	delete _loading[url]
22	+	return text
23	+	})
24	+	_cache[url] = request
25	+	}
26	+
27	+	return _cache[url]
28	+	}
29	+
30	+	let requestStatus = 'idle'
31	+
32	+	async function getUser(userId) {
33	+	requestStatus = 'loading'
34	+
35	+	const cachedRequest = _cache[`/user/${userId}`]
36	+
37	+	if (cachedRequest)
38	+	return await cachedRequest
39	+
40	+	const profile = await fetchWithCache(`/user/${userId}`)
41	+	requestStatus = 'success'
42	+	return profile
43	+	}
44	+
45	+	// 测试
46	+	getUser('123')
47	+	.then((data) => {
48	+	console.log(data) // 第一次请求
49	+	})
50	+
51	+	getUser('123')
52	+	.then((data) => {
53	+	console.log(data) // 第二次请求，应该从缓存中获取
54	+	})

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