<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
let http = (url) => {
return new Promise((resolve, reject) => {
setTimeout(() => {
console.log(new Date() + 'who come :' + url)
if (url == 3) {
resolve(url)
} else {
reject('不是我想要的')
}
}, 1000)
}).catch(err => {
})
// return new Promise((resolve, reject) => {
// fetch(url)
// .then((response) => {
// return response.json();
// })
// .then((res) => {
// resolve(res);
// })
// .catch((err) => {
// console.log(err)
// })
// });
}
let func = async (urls = [], urlIndex = 0) => {
if (urls.length === 0) {
return false;
}
let res = await http(urls[urlIndex]);
let nextIndex = urlIndex + 1;
if (nextIndex >= urls.length) {
return false;
} else {
return func(urls, nextIndex)
}
// if (res) {
// return res;
// } else {
// let nextIndex = urlIndex + 1
// if (nextIndex >= urls.length) {
// return false;
// } else {
// return func(urls, nextIndex)
// }
// }
}
// 此处为调用处
func([1, 2, 3, 4, 5]).then(res => {
console.log(res)
})
</script>
</body>
</html>
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