function randomString(length) { let str = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; let result = ''; for (let i = length; i > 0; --i) result += str[Math.floor(Math.random() * str.length)]; return result; }
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