fetch_error="Failed to fetch origin with $NVM_VERSION. Please report this!"
nvm_echo "=> Downloading nvm from git to '$INSTALL_DIR'"
command printf '\r=> '
mkdir -p "${INSTALL_DIR}"
if [ "$(ls -A "${INSTALL_DIR}")" ]; then
# Initializing repo
command git init "${INSTALL_DIR}" || {
nvm_echo >&2 'Failed to initialize nvm repo. Please report this!'
exit 2
}
command git --git-dir="${INSTALL_DIR}/.git" remote add origin "$(nvm_source)" 2> /dev/null \
|| command git --git-dir="${INSTALL_DIR}/.git" remote set-url origin "$(nvm_source)" || {
nvm_echo >&2 'Failed to add remote "origin" (or set the URL). Please report this!'
exit 2
}
else
# Cloning repo
command git clone "$(nvm_source)" --depth=1 "${INSTALL_DIR}" || {
nvm_echo >&2 'Failed to clone nvm repo. Please report this!'
exit 2
}
fi
fi
Try to fetch tag
if command git --git-dir=“
I
N
S
T
A
L
L
D
I
R
"
/
.
g
i
t
−
−
w
o
r
k
−
t
r
e
e
=
"
INSTALL_DIR"/.git --work-tree="
INSTALLDIR"/.git−−work−tree="INSTALL_DIR” fetch origin tag “$NVM_VERSION” --depth=1 2>/dev/null; then
:
Fetch given version
elif ! command git --git-dir=“
I
N
S
T
A
L
L
D
I
R
"
/
.
g
i
t
−
−
w
o
r
k
−
t
r
e
e
=
"
INSTALL_DIR"/.git --work-tree="
INSTALLDIR"/.git−−work−tree="INSTALL_DIR” fetch origin “KaTeX parse error: Expected 'EOF', got '&' at position 44: … nvm_echo >&̲2 "fetch_error”
exit 1
fi
command git -c advice.detachedHead=false --git-dir=“
I
N
S
T
A
L
L
D
I
R
"
/
.
g
i
t
−
−
w
o
r
k
−
t
r
e
e
=
"
INSTALL_DIR"/.git --work-tree="
INSTALLDIR"/.git−−work−tree="INSTALL_DIR” checkout -f --quiet FETCH_HEAD || {
nvm_echo >&2 “Failed to checkout the given version KaTeX parse error: Expected 'EOF', got '}' at position 48: …" exit 2 }̲ if [ -n "(command git --git-dir=“
I
N
S
T
A
L
L
D
I
R
"
/
.
g
i
t
−
−
w
o
r
k
−
t
r
e
e
=
"
INSTALL_DIR"/.git --work-tree="
INSTALLDIR"/.git−−work−tree="INSTALL_DIR” show-ref refs/heads/master)” ]; then
if command git --no-pager --git-dir=“
I
N
S
T
A
L
L
D
I
R
"
/
.
g
i
t
−
−
w
o
r
k
−
t
r
e
e
=
"
INSTALL_DIR"/.git --work-tree="
INSTALLDIR"/.git−−work−tree="INSTALL_DIR” branch --quiet 2>/dev/null; then
command git --no-pager --git-dir=“
I
N
S
T
A
L
L
D
I
R
"
/
.
g
i
t
−
−
w
o
r
k
−
t
r
e
e
=
"
INSTALL_DIR"/.git --work-tree="
INSTALLDIR"/.git−−work−tree="INSTALL_DIR” branch --quiet -D master >/dev/null 2>&1
else
nvm_echo >&2 “Your version of git is out of date. Please update it!”
command git --no-pager --git-dir=“
I
N
S
T
A
L
L
D
I
R
"
/
.
g
i
t
−
−
w
o
r
k
−
t
r
e
e
=
"
INSTALL_DIR"/.git --work-tree="
INSTALLDIR"/.git−−work−tree="INSTALL_DIR” branch -D master >/dev/null 2>&1
fi
fi
nvm_echo “=> Compressing and cleaning up git repository”
if ! command git --git-dir=“
I
N
S
T
A
L
L
D
I
R
"
/
.
g
i
t
−
−
w
o
r
k
−
t
r
e
e
=
"
INSTALL_DIR"/.git --work-tree="
INSTALLDIR"/.git−−work−tree="INSTALL_DIR” reflog expire --expire=now --all; then
nvm_echo >&2 “Your version of git is out of date. Please update it!”
fi
if ! command git --git-dir=“
I
N
S
T
A
L
L
D
I
R
"
/
.
g
i
t
−
−
w
o
r
k
−
t
r
e
e
=
"
INSTALL_DIR"/.git --work-tree="
INSTALLDIR"/.git−−work−tree="INSTALL_DIR” gc --auto --aggressive --prune=now ; then
nvm_echo >&2 “Your version of git is out of date. Please update it!”
fi
return
}
Automatically install Node.js
nvm_install_node() {
local NODE_VERSION_LOCAL
NODE_VERSION_LOCAL=“$(nvm_node_version)”
if [ -z “$NODE_VERSION_LOCAL” ]; then
return 0
fi
nvm_echo “=> Installing Node.js version
N
O
D
E
V
E
R
S
I
O
N
L
O
C
A
L
"
n
v
m
i
n
s
t
a
l
l
"
NODE_VERSION_LOCAL" nvm install "
NODEVERSIONLOCAL"nvminstall"NODE_VERSION_LOCAL”
local CURRENT_NVM_NODE
CURRENT_NVM_NODE="
(
n
v
m
v
e
r
s
i
o
n
c
u
r
r
e
n
t
)
"
i
f
[
"
(nvm_version current)" if [ "
(nvmversioncurrent)"if["(nvm_version “
N
O
D
E
V
E
R
S
I
O
N
L
O
C
A
L
"
)
"
=
=
"
NODE_VERSION_LOCAL")" == "
NODEVERSIONLOCAL")"=="CURRENT_NVM_NODE” ]; then
nvm_echo “=> Node.js version $NODE_VERSION_LOCAL has been successfully installed”
else
nvm_echo >&2 “Failed to install Node.js $NODE_VERSION_LOCAL”
fi
}
install_nvm_as_script() {
local INSTALL_DIR
INSTALL_DIR=“
(
n
v
m
i
n
s
t
a
l
l
d
i
r
)
"
l
o
c
a
l
N
V
M
S
O
U
R
C
E
L
O
C
A
L
N
V
M
S
O
U
R
C
E
L
O
C
A
L
=
"
(nvm_install_dir)" local NVM_SOURCE_LOCAL NVM_SOURCE_LOCAL="
(nvminstalldir)"localNVMSOURCELOCALNVMSOURCELOCAL="(nvm_source script)”
local NVM_EXEC_SOURCE
NVM_EXEC_SOURCE=“
(
n
v
m
s
o
u
r
c
e
s
c
r
i
p
t
−
n
v
m
−
e
x
e
c
)
"
l
o
c
a
l
N
V
M
B
A
S
H
C
O
M
P
L
E
T
I
O
N
S
O
U
R
C
E
N
V
M
B
A
S
H
C
O
M
P
L
E
T
I
O
N
S
O
U
R
C
E
=
"
(nvm_source script-nvm-exec)" local NVM_BASH_COMPLETION_SOURCE NVM_BASH_COMPLETION_SOURCE="
(nvmsourcescript−nvm−exec)"localNVMBASHCOMPLETIONSOURCENVMBASHCOMPLETIONSOURCE="(nvm_source script-nvm-bash-completion)”
Downloading to $INSTALL_DIR
mkdir -p “
I
N
S
T
A
L
L
D
I
R
"
i
f
[
−
f
"
INSTALL_DIR" if [ -f "
INSTALLDIR"if[−f"INSTALL_DIR/nvm.sh” ]; then
nvm_echo “=> nvm is already installed in
I
N
S
T
A
L
L
D
I
R
,
t
r
y
i
n
g
t
o
u
p
d
a
t
e
t
h
e
s
c
r
i
p
t
"
e
l
s
e
n
v
m
e
c
h
o
"
=
>
D
o
w
n
l
o
a
d
i
n
g
n
v
m
a
s
s
c
r
i
p
t
t
o
′
INSTALL_DIR, trying to update the script" else nvm_echo "=> Downloading nvm as script to '
INSTALLDIR,tryingtoupdatethescript"elsenvmecho"=>Downloadingnvmasscriptto′INSTALL_DIR’”
fi
nvm_download -s “
N
V
M
S
O
U
R
C
E
L
O
C
A
L
"
−
o
"
NVM_SOURCE_LOCAL" -o "
NVMSOURCELOCAL"−o"INSTALL_DIR/nvm.sh” || {
nvm_echo >&2 “Failed to download 'KaTeX parse error: Expected 'EOF', got '}' at position 35: … return 1 }̲ & nvm_downlo…NVM_EXEC_SOURCE” -o “KaTeX parse error: Expected '}', got '&' at position 42: … nvm_echo >&̲2 "Failed to do…NVM_EXEC_SOURCE’”
return 2
} &
nvm_download -s “
N
V
M
B
A
S
H
C
O
M
P
L
E
T
I
O
N
S
O
U
R
C
E
"
−
o
"
NVM_BASH_COMPLETION_SOURCE" -o "
NVMBASHCOMPLETIONSOURCE"−o"INSTALL_DIR/bash_completion” || {
nvm_echo >&2 “Failed to download ‘$NVM_BASH_COMPLETION_SOURCE’”
return 2
} &
for job in
(
j
o
b
s
−
p
∣
c
o
m
m
a
n
d
s
o
r
t
)
d
o
w
a
i
t
"
(jobs -p | command sort) do wait "
(jobs−p∣commandsort)dowait"job" || return
?
d
o
n
e
c
h
m
o
d
a
+
x
"
? done chmod a+x "
?donechmoda+x"INSTALL_DIR/nvm-exec" || {
nvm_echo >&2 “Failed to mark ‘$INSTALL_DIR/nvm-exec’ as executable”
return 3
}
}
nvm_try_profile() {
if [ -z “
1
−
"
]
∣
∣
[
!
−
f
"
{1-}" ] || [ ! -f "
1−"]∣∣[!−f"{1}” ]; then
return 1
fi
nvm_echo “${1}”
}
Detect profile file if not specified as environment variable
(eg: PROFILE=~/.myprofile)
The echo’ed path is guaranteed to be an existing file
Otherwise, an empty string is returned
nvm_detect_profile() {
if [ “${PROFILE-}” = ‘/dev/null’ ]; then
# the user has specifically requested NOT to have nvm touch their profile
return
fi
if [ -n “KaTeX parse error: Expected 'EOF', got '&' at position 14: {PROFILE}" ] &̲& [ -f "{PROFILE}” ]; then
nvm_echo “${PROFILE}”
return
fi
local DETECTED_PROFILE
DETECTED_PROFILE=‘’
if [ “KaTeX parse error: Expected '}', got '#' at position 7: {SHELL#̲*bash}" != "SHELL” ]; then
if [ -f “
H
O
M
E
/
.
b
a
s
h
r
c
"
]
;
t
h
e
n
D
E
T
E
C
T
E
D
P
R
O
F
I
L
E
=
"
HOME/.bashrc" ]; then DETECTED_PROFILE="
HOME/.bashrc"];thenDETECTEDPROFILE="HOME/.bashrc”
elif [ -f “
H
O
M
E
/
.
b
a
s
h
p
r
o
f
i
l
e
"
]
;
t
h
e
n
D
E
T
E
C
T
E
D
P
R
O
F
I
L
E
=
"
HOME/.bash_profile" ]; then DETECTED_PROFILE="
HOME/.bashprofile"];thenDETECTEDPROFILE="HOME/.bash_profile”
fi
elif [ “KaTeX parse error: Expected '}', got '#' at position 7: {SHELL#̲*zsh}" != "SHELL” ]; then
if [ -f “
H
O
M
E
/
.
z
s
h
r
c
"
]
;
t
h
e
n
D
E
T
E
C
T
E
D
P
R
O
F
I
L
E
=
"
HOME/.zshrc" ]; then DETECTED_PROFILE="
HOME/.zshrc"];thenDETECTEDPROFILE="HOME/.zshrc”
elif [ -f “
H
O
M
E
/
.
z
p
r
o
f
i
l
e
"
]
;
t
h
e
n
D
E
T
E
C
T
E
D
P
R
O
F
I
L
E
=
"
HOME/.zprofile" ]; then DETECTED_PROFILE="
HOME/.zprofile"];thenDETECTEDPROFILE="HOME/.zprofile”
fi
fi
if [ -z “
D
E
T
E
C
T
E
D
P
R
O
F
I
L
E
"
]
;
t
h
e
n
f
o
r
E
A
C
H
P
R
O
F
I
L
E
i
n
"
.
p
r
o
f
i
l
e
"
"
.
b
a
s
h
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c
"
"
.
b
a
s
h
p
r
o
f
i
l
e
"
"
.
z
p
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f
i
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e
"
"
.
z
s
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c
"
d
o
i
f
D
E
T
E
C
T
E
D
P
R
O
F
I
L
E
=
"
DETECTED_PROFILE" ]; then for EACH_PROFILE in ".profile" ".bashrc" ".bash_profile" ".zprofile" ".zshrc" do if DETECTED_PROFILE="
DETECTEDPROFILE"];thenforEACHPROFILEin".profile"".bashrc"".bashprofile"".zprofile"".zshrc"doifDETECTEDPROFILE="(nvm_try_profile “
H
O
M
E
/
{HOME}/
HOME/{EACH_PROFILE}”)”; then
break
fi
done
fi
if [ -n “
D
E
T
E
C
T
E
D
P
R
O
F
I
L
E
"
]
;
t
h
e
n
n
v
m
e
c
h
o
"
DETECTED_PROFILE" ]; then nvm_echo "
DETECTEDPROFILE"];thennvmecho"DETECTED_PROFILE”
fi
}
Check whether the user has any globally-installed npm modules in their system
Node, and warn them if so.
nvm_check_global_modules() {
local NPM_COMMAND
NPM_COMMAND=“
(
c
o
m
m
a
n
d
−
v
n
p
m
2
>
/
d
e
v
/
n
u
l
l
)
"
∣
∣
r
e
t
u
r
n
0
[
−
n
"
(command -v npm 2>/dev/null)" || return 0 [ -n "
(command−vnpm2>/dev/null)"∣∣return0[−n"{NVM_DIR}” ] && [ -z “KaTeX parse error: Expected '}', got 'EOF' at end of input: {NPM_COMMAND%%"NVM_DIR”/*}" ] && return 0
local NPM_VERSION
NPM_VERSION=“
(
n
p
m
−
−
v
e
r
s
i
o
n
)
"
N
P
M
V
E
R
S
I
O
N
=
"
(npm --version)" NPM_VERSION="
(npm−−version)"NPMVERSION="{NPM_VERSION:–1}”
[ “${NPM_VERSION%%[!-0-9]*}” -gt 0 ] || return 0
local NPM_GLOBAL_MODULES
NPM_GLOBAL_MODULES=“
(
n
p
m
l
i
s
t
−
g
−
−
d
e
p
t
h
=
0
∣
c
o
m
m
a
n
d
s
e
d
−
e
′
/
n
p
m
@
/
d
′
−
e
′
/
(
e
m
p
t
y
)
( npm list -g --depth=0 | command sed -e '/ npm@/d' -e '/ (empty)
(npmlist−g−−depth=0∣commandsed−e′/npm@/d′−e′/(empty)/d’
)”
local MODULE_COUNT
MODULE_COUNT=“
(
c
o
m
m
a
n
d
p
r
i
n
t
f
( command printf %s\\n "
(commandprintfNPM_GLOBAL_MODULES” |
command sed -ne ‘1!p’ | # Remove the first line
wc -l | command tr -d ’ ’ # Count entries
)"
if [ "KaTeX parse error: Expected 'EOF', got '#' at position 36: …0' ]; then #̲ shellcheck dis…PATH`)’
# shellcheck disable=SC2016
nvm_echo ‘=> override the binaries of modules installed with `nvm`:’
nvm_echo
command printf %s\\n "$NPM_GLOBAL_MODULES"
nvm_echo '=> If you wish to uninstall them at a later point (or re-install them under your'
# shellcheck disable=SC2016
nvm_echo '=> `nvm` Nodes), you can remove them from the system Node as follows:'
nvm_echo
nvm_echo ' $ nvm use system'
nvm_echo ' $ npm uninstall -g a_module'
nvm_echo
fi
}
nvm_do_install() {
if [ -n “KaTeX parse error: Expected 'EOF', got '&' at position 15: {NVM_DIR-}" ] &̲& ! [ -d "{NVM_DIR}” ]; then
if [ -e “KaTeX parse error: Expected 'EOF', got '&' at position 36: … nvm_echo >&̲2 "File \"{NVM_DIR}” has the same name as installation directory."
exit 1
fi
if [ "${NVM_DIR}" = "$(nvm_default_install_dir)" ]; then
mkdir "${NVM_DIR}"
else
nvm_echo >&2 "You have \$NVM_DIR set to \"${NVM_DIR}\", but that directory does not exist. Check your profile files and environment."
exit 1
fi
fi
Disable the optional which check, https://www.shellcheck.net/wiki/SC2230
shellcheck disable=SC2230
if nvm_has xcode-select && [ “$(xcode-select -p >/dev/null 2>/dev/null ; echo KaTeX parse error: Expected 'EOF', got '&' at position 13: ?)" = '2' ] &̲& [ "(which git)” = ‘/usr/bin/git’ ] && [ “KaTeX parse error: Expected 'EOF', got '&' at position 55: … nvm_echo >&̲2 'You may be o…{METHOD}” ]; then
# Autodetect install method
if nvm_has git; then
install_nvm_from_git
elif nvm_has curl || nvm_has wget; then
install_nvm_as_script
else
nvm_echo >&2 ‘You need git, curl, or wget to install nvm’
exit 1
fi
elif [ “KaTeX parse error: Expected 'EOF', got '&' at position 70: … nvm_echo >&̲2 "You need git…{METHOD}” = ‘script’ ]; then
if ! nvm_has curl && ! nvm_has wget; then
nvm_echo >&2 “You need curl or wget to install nvm”
exit 1
fi
install_nvm_as_script
else
nvm_echo >&2 “The environment variable $METHOD is set to “${METHOD}”, which is not recognized as a valid installation method.”
exit 1
fi
nvm_echo
local NVM_PROFILE
NVM_PROFILE=“
(
n
v
m
d
e
t
e
c
t
p
r
o
f
i
l
e
)
"
l
o
c
a
l
P
R
O
F
I
L
E
I
N
S
T
A
L
L
D
I
R
P
R
O
F
I
L
E
I
N
S
T
A
L
L
D
I
R
=
"
(nvm_detect_profile)" local PROFILE_INSTALL_DIR PROFILE_INSTALL_DIR="
(nvmdetectprofile)"localPROFILEINSTALLDIRPROFILEINSTALLDIR="(nvm_install_dir | command sed “s:^$HOME:$HOME:”)”
SOURCE_STR=“\nexport NVM_DIR=”${PROFILE_INSTALL_DIR}“\n[ -s “$NVM_DIR/nvm.sh” ] && \. “$NVM_DIR/nvm.sh” # This loads nvm\n”
shellcheck disable=SC2016
COMPLETION_STR=‘[ -s “KaTeX parse error: Expected 'EOF', got '&' at position 28: …_completion" ] &̲& \. "NVM_DIR/bash_completion” # This loads nvm bash_completion\n’
BASH_OR_ZSH=false
if [ -z “
N
V
M
P
R
O
F
I
L
E
−
"
]
;
t
h
e
n
l
o
c
a
l
T
R
I
E
D
P
R
O
F
I
L
E
i
f
[
−
n
"
{NVM_PROFILE-}" ] ; then local TRIED_PROFILE if [ -n "
NVMPROFILE−"];thenlocalTRIEDPROFILEif[−n"{PROFILE}” ]; then
TRIED_PROFILE=“${NVM_PROFILE} (as defined in $PROFILE), "
fi
nvm_echo “=> Profile not found. Tried
T
R
I
E
D
P
R
O
F
I
L
E
−
/
.
b
a
s
h
r
c
,
/
.
b
a
s
h
p
r
o
f
i
l
e
,
/
.
z
p
r
o
f
i
l
e
,
/
.
z
s
h
r
c
,
a
n
d
/
.
p
r
o
f
i
l
e
.
"
n
v
m
e
c
h
o
"
=
>
C
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e
a
t
e
o
n
e
o
f
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e
m
a
n
d
r
u
n
t
h
i
s
s
c
r
i
p
t
a
g
a
i
n
"
n
v
m
e
c
h
o
"
O
R
"
n
v
m
e
c
h
o
"
=
>
A
p
p
e
n
d
t
h
e
f
o
l
l
o
w
i
n
g
l
i
n
e
s
t
o
t
h
e
c
o
r
r
e
c
t
f
i
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{TRIED_PROFILE-}~/.bashrc, ~/.bash_profile, ~/.zprofile, ~/.zshrc, and ~/.profile." nvm_echo "=> Create one of them and run this script again" nvm_echo " OR" nvm_echo "=> Append the following lines to the correct file yourself:" command printf "
TRIEDPROFILE− /.bashrc, /.bashprofile, /.zprofile, /.zshrc,and /.profile."nvmecho"=>Createoneofthemandrunthisscriptagain"nvmecho"OR"nvmecho"=>Appendthefollowinglinestothecorrectfileyourself:"commandprintf"{SOURCE_STR}”
nvm_echo
else
if nvm_profile_is_bash_or_zsh “
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{NVM_PROFILE-}"; then BASH_OR_ZSH=true fi if ! command grep -qc '/nvm.sh' "
NVMPROFILE−";thenBASHORZSH=truefiif!commandgrep−qc′/nvm.sh′"NVM_PROFILE”; then
nvm_echo “=> Appending nvm source string to
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NVM_PROFILE" command printf "
NVMPROFILE"commandprintf"{SOURCE_STR}” >> “$NVM_PROFILE”
else
nvm_echo “=> nvm source string already in ${NVM_PROFILE}”
fi
# shellcheck disable=SC2016
if KaTeX parse error: Expected 'EOF', got '&' at position 15: {BASH_OR_ZSH} &̲& ! command gre…NVM_DIR/bash_completion’ “$NVM_PROFILE”; then
nvm_echo “=> Appending bash_completion source string to
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NVM_PROFILE" command printf "
NVMPROFILE"commandprintf"COMPLETION_STR” >> “$NVM_PROFILE”
else
nvm_echo “=> bash_completion source string already in ${NVM_PROFILE}”
fi
fi
if KaTeX parse error: Expected 'EOF', got '&' at position 15: {BASH_OR_ZSH} &̲& [ -z "{NVM_PROFILE-}” ] ; then
nvm_echo “=> Please also append the following lines to the if you are using bash/zsh shell:”
command printf “${COMPLETION_STR}”
fi
Source nvm
shellcheck source=/dev/null
. “$(nvm_install_dir)/nvm.sh”
nvm_check_global_modules
nvm_install_node
nvm_reset
nvm_echo “=> Close and reopen your terminal to start using nvm or run the following to use it now:”
command printf “${SOURCE_STR}”
if
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{BASH_OR_ZSH} ; then command printf "
BASHORZSH;thencommandprintf"{COMPLETION_STR}"
fi
}
Unsets the various functions defined
during the execution of the install script
nvm_reset() {
unset -f nvm_has nvm_install_dir nvm_latest_version nvm_profile_is_bash_or_zsh
nvm_source nvm_node_version nvm_download install_nvm_from_git nvm_install_node
install_nvm_as_script nvm_try_profile nvm_detect_profile nvm_check_global_modules
nvm_do_install nvm_reset nvm_default_install_dir nvm_grep
}
最后
总的来说，面试官要是考察思路就会从你实际做过的项目入手，考察你实际编码能力，就会让你在电脑敲代码，看你用什么编辑器、插件、编码习惯等。所以我们在回答面试官问题时，有一个清晰的逻辑思路，清楚知道自己在和面试官说项目说技术时的话就好了
pt nvm_try_profile nvm_detect_profile nvm_check_global_modules
nvm_do_install nvm_reset nvm_default_install_dir nvm_grep
}
最后
总的来说，面试官要是考察思路就会从你实际做过的项目入手，考察你实际编码能力，就会让你在电脑敲代码，看你用什么编辑器、插件、编码习惯等。所以我们在回答面试官问题时，有一个清晰的逻辑思路，清楚知道自己在和面试官说项目说技术时的话就好了
[外链图片转存中…(img-Jye4ypXQ-1725912815007)]
[外链图片转存中…(img-ULDZ49Za-1725912815009)]
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