генерировать случайный символ в JavaScript
var characters = 'abcdefghijklmnopqrstuvwxyz0123456789';
var result = ""
var chaactersLength = characters.length;
for ( var i = 0; i < 5 ; i++ ) {
result += characters.charAt(Math.floor(Math.random() * chaactersLength));
}
console.log(result)
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