为什么大多数网站的用户名都要求“必须以字母开头”？

http://ux.stackexchange.com/questions/16101/why-do-so-many-websites-have-the-restriction-of-user-names-starting-with-a-lette

An advantage of this restriction is URLs.

If a user's ID is 177896 and their username is H4rold, then you can have 2 URLs to reach this user depending on which information you have at hand:

http://example.com/user/177896
http://example.com/user/H4rold

Then, on that page, they determine how to look up the user by checking whether the first character is a letter or a digit. Alternatively, they could just force you to include at least one non-numeric character, though that increases the complexity of the check from a character comparison to either a regular expression or a looping multiple-character comparison.

However, not all websites with these restrictions take advantage of this flexibility. My theory is that web developers have seen this restriction so often that they just took it as the norm rather than investigating its purpose... We do that, sometimes.

@icecoffee 长知识了

看来本站是例外

@7colcor 23333333333333

@icecoffee 用 /userid/123123 和 /username/123123 不就好了……

@icecoffee
感谢普及知识。

@icecoffee 感谢，但是我个人认为在url里放用户的数字id是一种比较不礼貌的做法……

我觉得不是不礼貌，而是应该避免，毕竟用户并不需要（或者说不该）知道他/她的 ID，如果你有 username 的话

@hahastudio 同感

楼主如果有学过编程的话……

@ivanlw 楼主必然学过编程

QQ就是最好证明数字账号没有任何问题的例子 没有之一