Demo

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<div style="color: red;">123</div>
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//random string
const fun = () -> {
    const str = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    let result = '';
    for (let i = 0; i < 10; i++) {
        result += str[Math.floor(Math.random() * str.length)];
    }
    return result;
}