你如何在elisp中更改全局变量？

Question

package-archives
(("marmalade" . "http://marmalade-repo.org/packages/") ("gnu" . "http://elpa.gnu.org/packages/") ("melpa" . "http://melpa.milkbox.net/packages/"))

setq package-archives '(("melpa" . "http://melpa.milkbox.net/packages/"))
(("melpa" . "http://melpa.milkbox.net/packages/"))

但是当我再次评估package-archives时，我得到原始值：

package-archives
(("marmalade" . "http://marmalade-repo.org/packages/") ("gnu" . "http://elpa.gnu.org/packages/") ("melpa" . "http://melpa.milkbox.net/packages/"))

Answer 1

我只需要添加parens：

(setq package-archives '(("melpa" . "http://melpa.milkbox.net/packages/")))