rl.prompt([preserveCursor])
- 
preserveCursor<boolean> 如果为true,则防止光标位置重置为0。¥
preserveCursor<boolean> Iftrue, prevents the cursor placement from being reset to0. 
rl.prompt() 方法将配置为 prompt 的 readline.Interface 实例写入 output 中的新行,以便为用户提供用于提供输入的新位置。
¥The rl.prompt() method writes the readline.Interface instances configured
prompt to a new line in output in order to provide a user with a new
location at which to provide input.
当调用时,如果 rl.prompt() 流已暂停,则 rl.prompt() 将恢复 input 流。
¥When called, rl.prompt() will resume the input stream if it has been
paused.
如果 readline.Interface 是在 output 设置为 null 或 undefined 的情况下创建的,则不会写入提示。
¥If the readline.Interface was created with output set to null or
undefined the prompt is not written.