批量產生隨機字母，可選大小寫、分組長度與分隔符號。
All data is generated locally in your browser with a cryptographically-free PRNG — do not use for secrets.
Set the count and shape of the data, then press Generate as many times as you like.
Useful for unit tests, mock APIs, demos, load tests and sample documents.
Dates, names, emails and cities are realistic-looking but entirely fictional.
Tip: raise the count to a few hundred rows when you need bulk sample data.
