npm安裝showdown一直失敗

今天使用 npm install showdown --save 命令，安裝showdown失敗
安裝過程會(huì)停在下面的位置

?            ??????? ? unbuild: sill gentlyRm target.inParent =  false

之后會(huì)顯示下面的錯(cuò)誤提示：

npm ERR! path /Users/xxxx/Desktop/前端代碼/MyWebApp/node_modules/.bin/webpack-dev-server
npm ERR! code EEXIST
npm ERR! Refusing to delete /Users/xxxx/Desktop/前端代碼/MyWebApp/node_modules/.bin/webpack-dev-server: #!/bin/sh
npm ERR! basedir=$(dirname "$(echo "$0" | sed -e 's,\\,/,g')")
npm ERR!
npm ERR! case `uname` in
npm ERR!     *CYGWIN*) basedir=`cygpath -w "$basedir"`;;
npm ERR! esac
npm ERR!
npm ERR! if [ -x "$basedir/node" ]; then
npm ERR!   "$basedir/node"  "$basedir/../webpack-dev-server/bin/webpack-dev-server.js" "$@"
npm ERR!   ret=$?
npm ERR! else
npm ERR!   node  "$basedir/../webpack-dev-server/bin/webpack-dev-server.js" "$@"
npm ERR!   ret=$?
npm ERR! fi
npm ERR! exit $ret
npm ERR!  symlink target is not controlled by npm /Users/xxxx/Desktop/前端代碼/MyWebApp/node_modules/webpack-dev-server
npm ERR! File exists: /Users/xxxx/Desktop/前端代碼/MyWebApp/node_modules/.bin/webpack-dev-server
npm ERR! Move it away, and try again.

之后嘗試安裝其他包，但是都會(huì)失敗，且顯示如上相同的錯(cuò)誤提示。
還請(qǐng)各位高手給予幫助，多謝！