1. 下载LLVM，安装，并添加环境变量

下载地址：https://github.com/llvm/llvm-project/releases

安装好之后，将该软件的bin目录添加到环境变量：

2. vscode中安装clang-format的插件

若是没有装 C/C++ 的扩展，自己装一下。

键盘上同时按ctrl键和，键，搜索栏中输入 editor.format，勾选Format on Save的框，代码在修改完成保存时自动格式化。

搜索clang，设置格式化引擎的路径，就是刚才安装的LLVM的bin目录下的clange-format.exe的路径。

设置格式化的样式为file，即为从本地读取一个名称为.clang-format，的格式化的表。

3. clang-format的格式化样式表

在该c++的工程目录下，新建一个名为.clang-format的文件，输入一下内容：

Language:        Cpp
# BasedOnStyle:  Google
AccessModifierOffset: -4
AlignAfterOpenBracket: DontAlign
AlignConsecutiveMacros: true
AlignConsecutiveAssignments: false
AlignConsecutiveDeclarations: false
AlignEscapedNewlines: Left
AlignOperands:   true
AlignTrailingComments: true
AllowAllArgumentsOnNextLine: true
AllowAllConstructorInitializersOnNextLine: true
AllowAllParametersOfDeclarationOnNextLine: true
AllowShortBlocksOnASingleLine: false
AllowShortCaseLabelsOnASingleLine: false
AllowShortFunctionsOnASingleLine: InlineOnly
AllowShortLambdasOnASingleLine: All
AllowShortIfStatementsOnASingleLine: false
AllowShortLoopsOnASingleLine: false
AlwaysBreakAfterDefinitionReturnType: None
AlwaysBreakAfterReturnType: None
AlwaysBreakBeforeMultilineStrings: false
AlwaysBreakTemplateDeclarations: Yes
BinPackArguments: true
BinPackParameters: true
BraceWrapping:
  AfterCaseLabel:  false
  AfterClass:      true
  AfterControlStatement: true
  AfterEnum:       true
  AfterFunction:   true
  AfterNamespace:  true
  AfterObjCDeclaration: false
  AfterStruct:     true
  AfterUnion:      true
  AfterExternBlock: false
  BeforeCatch:     false
  BeforeElse:      true
  IndentBraces:    false
  SplitEmptyFunction: true
  SplitEmptyRecord: true
  SplitEmptyNamespace: true
BreakBeforeBinaryOperators: None
BreakBeforeBraces: Allman
BreakBeforeInheritanceComma: false
BreakInheritanceList: BeforeColon
BreakBeforeTernaryOperators: true
BreakConstructorInitializersBeforeComma: false
BreakConstructorInitializers: BeforeColon
BreakAfterJavaFieldAnnotations: false
BreakStringLiterals: true
ColumnLimit:     160
CommentPragmas:  '^ IWYU pragma:'
CompactNamespaces: false
ConstructorInitializerAllOnOneLineOrOnePerLine: false
ConstructorInitializerIndentWidth: 4
ContinuationIndentWidth: 4
Cpp11BracedListStyle: false
DerivePointerAlignment: false
DisableFormat:   false
ExperimentalAutoDetectBinPacking: false
FixNamespaceComments: true
ForEachMacros:
  - foreach
  - Q_FOREACH
  - BOOST_FOREACH
IncludeBlocks:   Regroup
IncludeCategories:
  - Regex:           '^<ext/.*\.h>'
    Priority:        2
  - Regex:           '^<.*\.h>'
    Priority:        1
  - Regex:           '^<.*'
    Priority:        2
  - Regex:           '.*'
    Priority:        3
IncludeIsMainRegex: '([-_](test|unittest))?$'
IndentCaseLabels: false
IndentPPDirectives: None
IndentWidth:     4
IndentWrappedFunctionNames: false
JavaScriptQuotes: Leave
JavaScriptWrapImports: true
KeepEmptyLinesAtTheStartOfBlocks: false
MacroBlockBegin: ''
MacroBlockEnd:   ''
MaxEmptyLinesToKeep: 1
NamespaceIndentation: All
ObjCBinPackProtocolList: Never
ObjCBlockIndentWidth: 4
ObjCSpaceAfterProperty: false
ObjCSpaceBeforeProtocolList: true
PenaltyBreakAssignment: 2
PenaltyBreakBeforeFirstCallParameter: 1
PenaltyBreakComment: 300
PenaltyBreakFirstLessLess: 120
PenaltyBreakString: 1000
PenaltyBreakTemplateDeclaration: 10
PenaltyExcessCharacter: 1000000
PenaltyReturnTypeOnItsOwnLine: 200
PointerAlignment: Right
RawStringFormats:
  - Language:        Cpp
    Delimiters:
      - cc
      - CC
      - cpp
      - Cpp
      - CPP
      - 'c++'
      - 'C++'
    CanonicalDelimiter: ''
    BasedOnStyle:    google
  - Language:        TextProto
    Delimiters:
      - pb
      - PB
      - proto
      - PROTO
    EnclosingFunctions:
      - EqualsProto
      - EquivToProto
      - PARSE_PARTIAL_TEXT_PROTO
      - PARSE_TEST_PROTO
      - PARSE_TEXT_PROTO
      - ParseTextOrDie
      - ParseTextProtoOrDie
    CanonicalDelimiter: ''
    BasedOnStyle:    google
ReflowComments:  true
SortIncludes:    false
SortUsingDeclarations: true
SpaceAfterCStyleCast: false
SpaceAfterLogicalNot: false
SpaceAfterTemplateKeyword: true
SpaceBeforeAssignmentOperators: true
SpaceBeforeCpp11BracedList: false
SpaceBeforeCtorInitializerColon: true
SpaceBeforeInheritanceColon: true
SpaceBeforeParens: ControlStatements
SpaceBeforeRangeBasedForLoopColon: true
SpaceInEmptyParentheses: false
SpacesBeforeTrailingComments: 1
SpacesInAngles:  false
SpacesInContainerLiterals: true
SpacesInCStyleCastParentheses: false
SpacesInParentheses: false
SpacesInSquareBrackets: false
Standard:        Cpp11
StatementMacros:
  - Q_UNUSED
  - QT_REQUIRE_VERSION
TabWidth:        4
UseTab:          Never

该文件，是我常用的格式化的样式。

vscode在保存代码的时候，能自动的根据上述样式，对代码进行格式化缩进。