javascript - 仅在评论中显示链接的一小部分

Question

如果用户在评论中插入了链接，则该链接需要被 chop 为 20 个字符。

如何制作？

例如:

Lorem ipsum: https://github.com/plataformatec/devise 

结果应该是这样。

Lorem ipsum: https://github.com/plataforma...

Answer 1

你想从哪一端 chop ？

使用String#[]您可以从任意一端获取子字符串:

s = "string with more than twenty characters"
s[0, 20] # get the first 20 characters
=> "string with more tha"
s[s.size-20, s.size] # the last 20 characters
=> "an twenty characters"

Rails 还添加了 truncate字符串方法:

"string with more than twenty characters".truncate(20)
=> "string with more ..."
"string with more than twenty characters".truncate(20, omission: "")
=> "string with more tha"

希望有帮助。