我已经通过自制软件安装了nvm。我已经遵循了警告：
mkdir ~/.nvm
cp $(brew --prefix nvm)/nvm-exec ~/.nvm/
添加到我的.zshrc文件中：
export NVM_DIR=~/.nvm
source $(brew --prefix nvm)/nvm.sh
我已经重启了我的shell，当我输入“which nvm”时，我得到文件输出而不是找到nvm版本的文件路径。我删除了包，重新安装。所有其他“哪个”命令有效。
非常感谢任何见解。
输入“which nvm”后的文件输出：
nvm () {
if [ $# -lt 1 ]
then
nvm help
return
fi
local GREP_OPTIONS
GREP_OPTIONS=''
local VERSION
local ADDITIONAL_PARAMETERS
local ALIAS
case $1 in
("help") echo
echo "Node Version Manager"
echo
echo "Usage:"
echo " nvm help Show this message"
echo " nvm --version Print out the latest released version of nvm"
echo " nvm install [-s] <version> Download and install a <version>, [-s] from source. Uses .nvmrc if available"
echo " nvm uninstall <version> Uninstall a version"
echo " nvm use <version> Modify PATH to use <version>. Uses .nvmrc if available"
echo " nvm run <version> [<args>] Run <version> with <args> as arguments. Uses .nvmrc if available for <version>"
echo " nvm current Display currently activated version"
echo " nvm ls List installed versions"
echo " nvm ls <version> List versions matching a given description"
echo " nvm ls-remote List remote versions available for install"
echo " nvm deactivate Undo effects of \`nvm\` on current shell"
echo " nvm alias [<pattern>] Show all aliases beginning with <pattern>"
echo " nvm alias <name> <version> Set an alias named <name> pointing to <version>"
echo " nvm unalias <name> Deletes the alias named <name>"
echo " nvm reinstall-packages <version> Reinstall global \`npm\` packages contained in <version> to current version"
echo " nvm unload Unload \`nvm\` from shell"
echo " nvm which [<version>] Display path to installed node version. Uses .nvmrc if available"
echo
echo "Example:"
echo " nvm install v0.10.32 Install a specific version number"
echo " nvm use 0.10 Use the latest available 0.10.x release"
echo " nvm run 0.10.32 app.js Run app.js using node v0.10.32"
echo " nvm exec 0.10.32 node app.js Run \`node app.js\` with the PATH pointing to node v0.10.32"
echo " nvm alias default 0.10.32 Set default node version on a shell"
echo
echo "Note:"
echo " to remove, delete, or uninstall nvm - just remove ~/.nvm, ~/.npm, and ~/.bower folders"
echo ;;
("install"|"i") local nobinary
local version_not_provided
version_not_provided=0
local provided_version
local NVM_OS
NVM_OS="$(nvm_get_os)"
if ! nvm_has "curl" && ! nvm_has "wget"
then
echo 'nvm needs curl or wget to proceed.' >&2
return 1
fi
if [ $# -lt 2 ]
then
version_not_provided=1
nvm_rc_version
if [ -z "$NVM_RC_VERSION" ]
then
nvm help >&2
return 127
fi
fi
shift
nobinary=0
if [ "_$1" = "_-s" ]
then
nobinary=1
shift
fi
provided_version="$1"
if [ -z "$provided_version" ]
then
if [ $version_not_provided -ne 1 ]
then
nvm_rc_version
fi
provided_version="$NVM_RC_VERSION"
else
shift
fi
VERSION="$(nvm_remote_version "$provided_version")"
if [ "_$VERSION" = "_N/A" ]
then
echo "Version '$provided_version' not found - try \`nvm ls-remote\` to browse available versions." >&2
return 3
fi
ADDITIONAL_PARAMETERS=''
local PROVIDED_REINSTALL_PACKAGES_FROM
local REINSTALL_PACKAGES_FROM
while [ $# -ne 0 ]
do
case "$1" in
(--reinstall-packages-from=*) PROVIDED_REINSTALL_PACKAGES_FROM="$(echo "$1" | command cut -c 27-)"
REINSTALL_PACKAGES_FROM="$(nvm_version "$PROVIDED_REINSTALL_PACKAGES_FROM")" ;;
(--copy-packages-from=*) PROVIDED_REINSTALL_PACKAGES_FROM="$(echo "$1" | command cut -c 22-)"
REINSTALL_PACKAGES_FROM="$(nvm_version "$PROVIDED_REINSTALL_PACKAGES_FROM")" ;;
(*) ADDITIONAL_PARAMETERS="$ADDITIONAL_PARAMETERS $1" ;;
esac
shift
done
if [ "_$(nvm_ensure_version_prefix "$PROVIDED_REINSTALL_PACKAGES_FROM")" = "_$VERSION" ]
then
echo "You can't reinstall global packages from the same version of node you're installing." >&2
return 4
elif [ ! -z "$PROVIDED_REINSTALL_PACKAGES_FROM" ] && [ "_$REINSTALL_PACKAGES_FROM" = "_N/A" ]
then
echo "If --reinstall-packages-from is provided, it must point to an installed version of node." >&2
return 5
fi
local NVM_IOJS
if nvm_is_iojs_version "$VERSION"
then
NVM_IOJS=true
fi
local VERSION_PATH
VERSION_PATH="$(nvm_version_path "$VERSION")"
if [ -d "$VERSION_PATH" ]
then
echo "$VERSION is already installed." >&2
if nvm use "$VERSION" && [ ! -z "$REINSTALL_PACKAGES_FROM" ] && [ "_$REINSTALL_PACKAGES_FROM" != "_N/A" ]
then
nvm reinstall-packages "$REINSTALL_PACKAGES_FROM"
fi
return $?
fi
if [ "_$NVM_OS" = "_freebsd" ]
then
nobinary=1
elif [ "_$NVM_OS" = "_sunos" ] && [ "$NVM_IOJS" = true ]
then
nobinary=1
fi
local NVM_INSTALL_SUCCESS
if [ $nobinary -ne 1 ] && nvm_binary_available "$VERSION"
then
if [ "$NVM_IOJS" = true ] && nvm_install_iojs_binary "$VERSION" "$REINSTALL_PACKAGES_FROM"
then
NVM_INSTALL_SUCCESS=true
elif [ "$NVM_IOJS" != true ] && nvm_install_node_binary "$VERSION" "$REINSTALL_PACKAGES_FROM"
then
NVM_INSTALL_SUCCESS=true
fi
fi
if [ "$NVM_INSTALL_SUCCESS" != true ]
then
if [ "$NVM_IOJS" = true ]
then
echo "Installing iojs from source is not currently supported" >&2
return 105
elif nvm_install_node_source "$VERSION" "$ADDITIONAL_PARAMETERS"
then
NVM_INSTALL_SUCCESS=true
fi
fi
if [ "$NVM_INSTALL_SUCCESS" = true ] && nvm use "$VERSION"
then
if [ ! -z "$REINSTALL_PACKAGES_FROM" ] && [ "_$REINSTALL_PACKAGES_FROM" != "_N/A" ]
then
nvm reinstall-packages "$REINSTALL_PACKAGES_FROM"
fi
fi
return $? ;;
("uninstall") if [ $# -ne 2 ]
then
nvm help >&2
return 127
fi
local PATTERN
PATTERN="$2"
case "_$PATTERN" in
("_$(nvm_iojs_prefix)"|"_$(nvm_iojs_prefix)-"|"_$(nvm_node_prefix)"|"_$(nvm_node_prefix)-") VERSION="$(nvm_version "$PATTERN")" ;;
(*) VERSION="$(nvm_version "$PATTERN")" ;;
esac
if [ "_$VERSION" = "_$(nvm_ls_current)" ]
then
if nvm_is_iojs_version "$VERSION"
then
echo "nvm: Cannot uninstall currently-active io.js version, $VERSION (inferred from $PATTERN)." >&2
else
echo "nvm: Cannot uninstall currently-active node version, $VERSION (inferred from $PATTERN)." >&2
fi
return 1
fi
local VERSION_PATH
VERSION_PATH="$(nvm_version_path "$VERSION")"
if [ ! -d "$VERSION_PATH" ]
then
echo "$VERSION version is not installed..." >&2
return
fi
t="$VERSION-$(nvm_get_os)-$(nvm_get_arch)"
local NVM_PREFIX
local NVM_SUCCESS_MSG
if nvm_is_iojs_version "$VERSION"
then
NVM_PREFIX="$(nvm_iojs_prefix)"
NVM_SUCCESS_MSG="Uninstalled io.js $(nvm_strip_iojs_prefix $VERSION)"
else
NVM_PREFIX="$(nvm_node_prefix)"
NVM_SUCCESS_MSG="Uninstalled node $VERSION"
fi
command rm -rf "$NVM_DIR/src/$NVM_PREFIX-$VERSION" "$NVM_DIR/src/$NVM_PREFIX-$VERSION.tar.gz" "$NVM_DIR/bin/$NVM_PREFIX-${t}" "$NVM_DIR/bin/$NVM_PREFIX-${t}.tar.gz" "$VERSION_PATH" 2> /dev/null
echo "$NVM_SUCCESS_MSG"
for ALIAS in `command grep -l $VERSION "$(nvm_alias_path)/*" 2>/dev/null`
do
nvm unalias "$(command basename "$ALIAS")"
done ;;
("deactivate") local NEWPATH
NEWPATH="$(nvm_strip_path "$PATH" "/bin")"
if [ "_$PATH" = "_$NEWPATH" ]
then
echo "Could not find $NVM_DIR/*/bin in \$PATH" >&2
else
export PATH="$NEWPATH"
hash -r
echo "$NVM_DIR/*/bin removed from \$PATH"
fi
NEWPATH="$(nvm_strip_path "$MANPATH" "/share/man")"
if [ "_$MANPATH" = "_$NEWPATH" ]
then
echo "Could not find $NVM_DIR/*/share/man in \$MANPATH" >&2
else
export MANPATH="$NEWPATH"
echo "$NVM_DIR/*/share/man removed from \$MANPATH"
fi
NEWPATH="$(nvm_strip_path "$NODE_PATH" "/lib/node_modules")"
if [ "_$NODE_PATH" != "_$NEWPATH" ]
then
export NODE_PATH="$NEWPATH"
echo "$NVM_DIR/*/lib/node_modules removed from \$NODE_PATH"
fi ;;
("use") local PROVIDED_VERSION
if [ $# -eq 1 ]
then
nvm_rc_version
if [ -n "$NVM_RC_VERSION" ]
then
PROVIDED_VERSION="$NVM_RC_VERSION"
VERSION="$(nvm_version "$PROVIDED_VERSION")"
fi
else
local NVM_IOJS_PREFIX
NVM_IOJS_PREFIX="$(nvm_iojs_prefix)"
local NVM_NODE_PREFIX
NVM_NODE_PREFIX="$(nvm_node_prefix)"
PROVIDED_VERSION="$2"
case "_$PROVIDED_VERSION" in
("_$NVM_IOJS_PREFIX"|"_io.js") VERSION="$(nvm_version $NVM_IOJS_PREFIX)" ;;
("_system") VERSION="system" ;;
(*) VERSION="$(nvm_version "$PROVIDED_VERSION")" ;;
esac
fi
if [ -z "$VERSION" ]
then
nvm help >&2
return 127
fi
if [ "_$VERSION" = '_system' ]
then
if nvm_has_system_node && nvm deactivate > /dev/null 2>&1
then
echo "Now using system version of node: $(node -v 2>/dev/null)$(nvm_print_npm_version)"
return
elif nvm_has_system_iojs && nvm deactivate > /dev/null 2>&1
then
echo "Now using system version of io.js: $(iojs --version 2>/dev/null)$(nvm_print_npm_version)"
return
else
echo "System version of node not found." >&2
return 127
fi
elif [ "_$VERSION" = "_∞" ]
then
echo "The alias \"$PROVIDED_VERSION\" leads to an infinite loop. Aborting." >&2
return 8
fi
nvm_ensure_version_installed "$PROVIDED_VERSION"
EXIT_CODE=$?
if [ "$EXIT_CODE" != "0" ]
then
return $EXIT_CODE
fi
local NVM_VERSION_DIR
NVM_VERSION_DIR="$(nvm_version_path "$VERSION")"
PATH="$(nvm_strip_path "$PATH" "/bin")"
PATH="$(nvm_prepend_path "$PATH" "$NVM_VERSION_DIR/bin")"
if nvm_has manpath
then
if [ -z "$MANPATH" ]
then
MANPATH=$(manpath)
fi
MANPATH="$(nvm_strip_path "$MANPATH" "/share/man")"
MANPATH="$(nvm_prepend_path "$MANPATH" "$NVM_VERSION_DIR/share/man")"
export MANPATH
fi
export PATH
hash -r
export NVM_PATH="$NVM_VERSION_DIR/lib/node"
export NVM_BIN="$NVM_VERSION_DIR/bin"
if [ "$NVM_SYMLINK_CURRENT" = true ]
then
command rm -f "$NVM_DIR/current" && ln -s "$NVM_VERSION_DIR" "$NVM_DIR/current"
fi
if nvm_is_iojs_version "$VERSION"
then
echo "Now using io.js $(nvm_strip_iojs_prefix "$VERSION")$(nvm_print_npm_version)"
else
echo "Now using node $VERSION$(nvm_print_npm_version)"
fi ;;
("run") local provided_version
local has_checked_nvmrc
has_checked_nvmrc=0
shift
if [ $# -lt 1 ]
then
nvm_rc_version && has_checked_nvmrc=1
if [ -n "$NVM_RC_VERSION" ]
then
VERSION="$(nvm_version "$NVM_RC_VERSION")"
else
VERSION='N/A'
fi
if [ $VERSION = "N/A" ]
then
nvm help >&2
return 127
fi
fi
provided_version=$1
if [ -n "$provided_version" ]
then
VERSION="$(nvm_version "$provided_version")"
if [ "_$VERSION" = "_N/A" ] && ! nvm_is_valid_version "$provided_version"
then
provided_version=''
if [ $has_checked_nvmrc -ne 1 ]
then
nvm_rc_version && has_checked_nvmrc=1
fi
VERSION="$(nvm_version "$NVM_RC_VERSION")"
else
shift
fi
fi
local NVM_IOJS
if nvm_is_iojs_version "$VERSION"
then
NVM_IOJS=true
fi
local ARGS
ARGS="$@"
local OUTPUT
local EXIT_CODE
local ZHS_HAS_SHWORDSPLIT_UNSET
ZHS_HAS_SHWORDSPLIT_UNSET=1
if nvm_has "setopt"
then
ZHS_HAS_SHWORDSPLIT_UNSET=$(setopt | command grep shwordsplit > /dev/null ; echo $?)
setopt shwordsplit
fi
if [ "_$VERSION" = "_N/A" ]
then
echo "$(nvm_ensure_version_prefix "$provided_version") is not installed yet" >&2
EXIT_CODE=1
elif [ -z "$ARGS" ]
then
if [ "$NVM_IOJS" = true ]
then
nvm exec "$VERSION" iojs
else
nvm exec "$VERSION" node
fi
EXIT_CODE="$?"
elif [ "$NVM_IOJS" = true ]
then
echo "Running io.js $(nvm_strip_iojs_prefix "$VERSION")"
OUTPUT="$(nvm use "$VERSION" >/dev/null && iojs $ARGS)"
EXIT_CODE="$?"
else
echo "Running node $VERSION"
OUTPUT="$(nvm use "$VERSION" >/dev/null && node $ARGS)"
EXIT_CODE="$?"
fi
if [ $ZHS_HAS_SHWORDSPLIT_UNSET -eq 1 ] && nvm_has "unsetopt"
then
unsetopt shwordsplit
fi
if [ -n "$OUTPUT" ]
then
echo "$OUTPUT"
fi
return $EXIT_CODE ;;
("exec") shift
local provided_version
provided_version="$1"
if [ -n "$provided_version" ]
then
VERSION="$(nvm_version "$provided_version")"
if [ "_$VERSION" = "_N/A" ]
then
nvm_rc_version
provided_version="$NVM_RC_VERSION"
VERSION="$(nvm_version "$provided_version")"
else
shift
fi
fi
nvm_ensure_version_installed "$provided_version"
EXIT_CODE=$?
if [ "$EXIT_CODE" != "0" ]
then
return $EXIT_CODE
fi
echo "Running node $VERSION"
NODE_VERSION="$VERSION" $NVM_DIR/nvm-exec "$@" ;;
("ls"|"list") local NVM_LS_OUTPUT
local NVM_LS_EXIT_CODE
NVM_LS_OUTPUT=$(nvm_ls "$2")
NVM_LS_EXIT_CODE=$?
nvm_print_versions "$NVM_LS_OUTPUT"
if [ $# -eq 1 ]
then
nvm alias
fi
return $NVM_LS_EXIT_CODE ;;
("ls-remote"|"list-remote") local PATTERN
PATTERN="$2"
local NVM_FLAVOR
case "_$PATTERN" in
("_$(nvm_iojs_prefix)"|"_$(nvm_node_prefix)") NVM_FLAVOR="$PATTERN"
PATTERN="$3" ;;
esac
local NVM_LS_REMOTE_EXIT_CODE
NVM_LS_REMOTE_EXIT_CODE=0
local NVM_LS_REMOTE_OUTPUT
NVM_LS_REMOTE_OUTPUT=''
if [ "_$NVM_FLAVOR" != "_$(nvm_iojs_prefix)" ]
then
NVM_LS_REMOTE_OUTPUT=$(nvm_ls_remote "$PATTERN")
NVM_LS_REMOTE_EXIT_CODE=$?
fi
local NVM_LS_REMOTE_IOJS_EXIT_CODE
NVM_LS_REMOTE_IOJS_EXIT_CODE=0
local NVM_LS_REMOTE_IOJS_OUTPUT
NVM_LS_REMOTE_IOJS_OUTPUT=''
if [ "_$NVM_FLAVOR" != "_$(nvm_node_prefix)" ]
then
NVM_LS_REMOTE_IOJS_OUTPUT=$(nvm_ls_remote_iojs "$PATTERN")
NVM_LS_REMOTE_IOJS_EXIT_CODE=$?
fi
local NVM_OUTPUT
NVM_OUTPUT="$(echo "$NVM_LS_REMOTE_OUTPUT
$NVM_LS_REMOTE_IOJS_OUTPUT" | command grep -v "N/A" | sed '/^$/d')"
if [ -n "$NVM_OUTPUT" ]
then
nvm_print_versions "$NVM_OUTPUT"
return $NVM_LS_REMOTE_EXIT_CODE || $NVM_LS_REMOTE_IOJS_EXIT_CODE
else
nvm_print_versions "N/A"
return 3
fi ;;
("current") nvm_version current ;;
("which") local provided_version
provided_version="$2"
if [ $# -eq 1 ]
then
nvm_rc_version
if [ -n "$NVM_RC_VERSION" ]
then
provided_version="$NVM_RC_VERSION"
VERSION=$(nvm_version "$NVM_RC_VERSION")
fi
elif [ "_$2" != '_system' ]
then
VERSION="$(nvm_version "$provided_version")"
else
VERSION="$2"
fi
if [ -z "$VERSION" ]
then
nvm help >&2
return 127
fi
if [ "_$VERSION" = '_system' ]
then
if nvm_has_system_iojs > /dev/null 2>&1 || nvm_has_system_node > /dev/null 2>&1
then
local NVM_BIN
NVM_BIN="$(nvm use system >/dev/null 2>&1 && command which node)"
if [ -n "$NVM_BIN" ]
then
echo "$NVM_BIN"
return
else
return 1
fi
else
echo "System version of node not found." >&2
return 127
fi
elif [ "_$VERSION" = "_∞" ]
then
echo "The alias \"$2\" leads to an infinite loop. Aborting." >&2
return 8
fi
nvm_ensure_version_installed "$provided_version"
EXIT_CODE=$?
if [ "$EXIT_CODE" != "0" ]
then
return $EXIT_CODE
fi
local NVM_VERSION_DIR
NVM_VERSION_DIR="$(nvm_version_path "$VERSION")"
echo "$NVM_VERSION_DIR/bin/node" ;;
("alias") local NVM_ALIAS_DIR
NVM_ALIAS_DIR="$(nvm_alias_path)"
command mkdir -p "$NVM_ALIAS_DIR"
if [ $# -le 2 ]
then
local DEST
for ALIAS_PATH in "$NVM_ALIAS_DIR"/"$2"*
do
ALIAS="$(command basename "$ALIAS_PATH")"
DEST="$(nvm_alias "$ALIAS" 2> /dev/null)"
if [ -n "$DEST" ]
then
VERSION="$(nvm_version "$DEST")"
if [ "_$DEST" = "_$VERSION" ]
then
echo "$ALIAS -> $DEST"
else
echo "$ALIAS -> $DEST (-> $VERSION)"
fi
fi
done
for ALIAS in "$(nvm_node_prefix)" "stable" "unstable" "$(nvm_iojs_prefix)"
do
if [ ! -f "$NVM_ALIAS_DIR/$ALIAS" ]
then
if [ $# -lt 2 ] || [ "~$ALIAS" = "~$2" ]
then
DEST="$(nvm_print_implicit_alias local "$ALIAS")"
if [ "_$DEST" != "_" ]
then
VERSION="$(nvm_version "$DEST")"
echo "$ALIAS -> $DEST (-> $VERSION) (default)"
fi
fi
fi
done
return
fi
if [ -z "$3" ]
then
command rm -f "$NVM_ALIAS_DIR/$2"
echo "$2 -> *poof*"
return
fi
VERSION="$(nvm_version "$3")"
if [ $? -ne 0 ]
then
echo "! WARNING: Version '$3' does not exist." >&2
fi
echo "$3" | tee "$NVM_ALIAS_DIR/$2" > /dev/null
if [ ! "_$3" = "_$VERSION" ]
then
echo "$2 -> $3 (-> $VERSION)"
else
echo "$2 -> $3"
fi ;;
("unalias") local NVM_ALIAS_DIR
NVM_ALIAS_DIR="$(nvm_alias_path)"
command mkdir -p "$NVM_ALIAS_DIR"
if [ $# -ne 2 ]
then
nvm help >&2
return 127
fi
[ ! -f "$NVM_ALIAS_DIR/$2" ] && echo "Alias $2 doesn't exist!" >&2 && return
command rm -f "$NVM_ALIAS_DIR/$2"
echo "Deleted alias $2" ;;
("reinstall-packages"|"copy-packages") if [ $# -ne 2 ]
then
nvm help >&2
return 127
fi
local PROVIDED_VERSION
PROVIDED_VERSION="$2"
if [ "$PROVIDED_VERSION" = "$(nvm_ls_current)" ] || [ "$(nvm_version "$PROVIDED_VERSION")" = "$(nvm_ls_current)" ]
then
echo 'Can not reinstall packages from the current version of node.' >&2
return 2
fi
local NPMLIST
if [ "_$PROVIDED_VERSION" = "_system" ]
then
if ! nvm_has_system_node && ! nvm_has_system_iojs
then
echo 'No system version of node or io.js detected.' >&2
return 3
fi
NPMLIST=$(nvm deactivate > /dev/null && npm list -g --depth=0 | command tail -n +2)
else
local VERSION
VERSION="$(nvm_version "$PROVIDED_VERSION")"
NPMLIST=$(nvm use "$VERSION" > /dev/null && npm list -g --depth=0 | command tail -n +2)
fi
local INSTALLS
INSTALLS=$(echo "$NPMLIST" | command sed -e '/ -> / d' -e 's/^.* \(.*\)@.*/\1/' -e '/^npm$/ d' | command xargs)
echo "Copying global packages from $VERSION..."
echo "$INSTALLS" | command xargs npm install -g --quiet
local LINKS
LINKS=$(echo "$NPMLIST" | command sed -n 's/.* -> \(.*\)/\1/ p')
echo "Linking global packages from $VERSION..."
for LINK in $LINKS
do
(
cd "$LINK" && npm link
)
done ;;
("clear-cache") command rm -f $NVM_DIR/v* "$(nvm_version_dir)" 2> /dev/null
echo "Cache cleared." ;;
("version") nvm_version $2 ;;
("--version") echo "0.25.1" ;;
("unload") unset -f nvm nvm_print_versions nvm_checksum nvm_iojs_prefix nvm_node_prefix nvm_add_iojs_prefix nvm_strip_iojs_prefix nvm_is_iojs_version nvm_ls_remote nvm_ls nvm_remote_version nvm_remote_versions nvm_version nvm_rc_version nvm_version_greater nvm_version_greater_than_or_equal_to nvm_supports_source_options > /dev/null 2>&1
unset RC_VERSION NVM_NODEJS_ORG_MIRROR NVM_DIR NVM_CD_FLAGS > /dev/null 2>&1 ;;
(*) nvm help >&2
return 127 ;;
esac
}
答案 0 :(得分：5)
将source $(brew --prefix nvm)/nvm.sh导出nvm() function到您的shell环境中。它不是对可执行文件的引用，而是您在执行which nvm时看到的内容的函数。