刚刚又搓了个用户数量显示器，加了二分法

技术 | Technology
1

```js
const fs = require(‘fs’);
const fetch = require(‘node-fetch’);

let userId = 100;
let rf = false;
let cache = null;

try {
userId = require(‘./config.json’);
} catch (error) {}

async function save() {
if (userId === cache) return;
fs.writeFileSync(‘./config.json’, JSON.stringify(userId), ‘utf-8’);
cache = userId;
}

async function isUser(id) {
try {
let req = await fetch(https://www.nodeloc.com/api/users/${id});
return !!(await req.json()).data;
} catch (error) {
return await isUser(id);
}
}

async function sub(id, retry = 0) {
if (await isUser(id)) {
if (retry > 0) console.log(警告：此数字此时可能并不准确！);
if (retry > 10 && !rf) {
console.log(警告：已失去同步，二分法同步中...);
await ef();
return userId;
}
return await sub(id + 1, retry + 1);
}
return id - 1;
}

async function ef() {
rf = true;

let pending = true;
let min = userId;
let max = userId + 10000;

while(pending) {
let id = Math.floor((max + min) / 2);
if (await isUser(id)) {
min = id;
} else {
max = id;
}
console.log([${min}, ${max}] (${id}));
if (max - min == 1) {
userId = min;
pending = false;
}
}

await save();
rf = false;
}

async function updateUserId() {
userId = await sub(userId + 1);
await save();
}

async function render() {
if (rf) {
setTimeout(rendr, 1000);
return;
}
await updateUserId();
console.clear();
console.log(UserId: ${userId});
render();
}

render();
```

使用方法照旧，新版本不需要很长的同步时间

</s><i> </i>警告：此数字此时可能并不准确！ 警告：已失去同步，二分法同步中... [10000, 15000] (15000) [10000, 12500] (12500) [10000, 11250] (11250) [10000, 10625] (10625) [10000, 10312] (10312) [10000, 10156] (10156) [10000, 10078] (10078) [10000, 10039] (10039) [10019, 10039] (10019) [10019, 10029] (10029) [10019, 10024] (10024) [10021, 10024] (10021) [10021, 10022] (10022)<i> </i><e>
</s><i> </i>UserId: 10021<i> </i><e>

2

当前用户数：[img src=https://y.eo.mk/NLUserCount/?type=img width=100]