在看文档的时候，这里有点疑问
C-j at the end of s-expression prints the result in the scratch buffer.
但是我试了一下，只是换行而已，查一下帮助文档
C-j runs the command electric-newline-and-maybe-indent (found in
global-map), which is an interactive compiled Lisp function in
‘electric.el’.
It is bound to C-j.
(electric-newline-and-maybe-indent)
Insert a newline.
If ‘electric-indent-mode’ is enabled, that’s that, but if it
is *disabled* then additionally indent according to major mode.
Indentation is done using the value of ‘indent-line-function’.
In programming language modes, this is the same as TAB.
In some text modes, where TAB inserts a tab, this command indents to the
column specified by the function ‘current-left-margin’.
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我不知道这有什么误解，请帮我看看