奇怪的尾隨字符

Question

這裏的後端代碼：

res.statusCode = 400 
res.setHeader 'Content-Type', 'text/plain' 
res.end 'Invalid API endpoint.' 

當我從終端捲曲它，我得到：

Invalid API endpoint.% 

的「％」符號顯示了反色。

爲什麼那個「％」在那裏籤？

Answer 1

這標誌着部分行，因爲響應發送沒有尾隨換行符。從

man zshoptions 

PROMPT_SP <D> 
      Attempt to preserve a partial line (i.e. a line that did not 
      end with a newline) that would otherwise be covered up by the 
      command prompt due to the PROMPT_CR option. This works by out‐ 
      putting some cursor-control characters, including a series of 
      spaces, that should make the terminal wrap to the next line 
      when a partial line is present (note that this is only success‐ 
      ful if your terminal has automatic margins, which is typical). 

  When a partial line is preserved, by default you will see an 
      inverse+bold character at the end of the partial line: a "%" 
      for a normal user or a "#" for root. If set, the shell parame‐ 
      ter PROMPT_EOL_MARK can be used to customize how the end of 
      partial lines are shown. 

      NOTE: if the PROMPT_CR option is not set, enabling this option 
      will have no effect. This option is on by default.