打开vscode 【文件】=》【首选项】=》【用户代码片段】，会让你输出代码片段类型，也就是给什么代码用的，
关于代码片段语法参考：
贴出我的C++代码片段：
{"for": {"prefix": "for","body": ["for (${size_t} ${i} = ${1:0}; ${i} < ${2:length}; ${i}++) {","$3","}"],"description": "A Code snippet for 'for' loop"},"forr": {"prefix": "forr","body": ["for (int ${i} = ${1:length} - 1; ${i} >= ${2:0}; ${i}--) {","$3","}"],"description": "Code snippet for reverse 'for' loop"},"do": {"prefix": "do","body": ["do {","$1","} while(${2:condition});"],"description": "Code snippet for do...while loop"},"while": {"prefix": "while","body": ["while (${1:condition}) {","$2","}"],"description": "Code snippet for while loop"},"foreach": {"prefix": "foreach","body": ["for(auto& ${var} : ${1:list}) {","$2","}"],"description": "Code snippet for const range-based for loop (c++11) statement"}, "foreachconst": {"prefix": "foreachconst","body": ["for(const auto& ${var} : ${1:list}) {","$2","}"],"description": "Code snippet for const range-based for loop (c++11) statement"},"if": {"prefix": "if","body": ["if (${1:condition}) {","$2","}"],"description": "Code snippet for if statement"},"else": {"prefix": "else","body": ["else {","$1","}"],"description": "Code snippet for else statement"},"else if": {"prefix": "else if","body": ["else if (${1:condition}) {","$2","}"],"description": "Code snippet for else-if statement"},"enum": {"prefix": "enum","body": ["enum ${1:MyEnum} {","$2","};"],"description": "Code snippet for enum"},"enum class": {"prefix": "enum class","body": ["enum class ${1:MyClass} { $2 };"],"description": "Code snippet for enum class (c++11)"},"class": {"prefix": "class","body": ["class ${1:MyClass} {"," public:","${1}();","${1}(${1} &&) = default;","${1}(const ${1} &) = default;","${1} &operator=(${1} &&) = default;","${1} &operator=(const ${1} &) = default;","~${1}();",""," private:","$2","};","","${1}::${1}() {","}","","${1}::~${1}() {","}"],"description": "Code snippet for class"},"classi": {"prefix": "classi","body": ["class ${1:MyClass} {"," public:","${1}() = default;","${1}(${1} &&) = default;","${1}(const ${1} &) = default;","${1} &operator=(${1} &&) = default;","${1} &operator=(const ${1} &) = default;","~${1}() = default;",""," private:","$2","};"],"description": "Code snippet for class with inline constructor/destructor"},"namespace": {"prefix": "namespace","body": ["namespace ${1:MyNamespace} {","$2","} // ${1}"],"description": "Code snippet for namespace"},"#ifdef": {"prefix": "#ifdef","body": ["#ifdef ${DEBUG}","$1","#endif // ${DEBUG}"],"description": "Code snippet for #ifdef"},"#ifndef": {"prefix": "#ifndef","body": ["#ifndef ${1:1}","$2","#endif // !$1"],"description": "Code snippet for #ifndef"},"#if": {"prefix": "#ifdef","body": ["#ifdef ${1:0}","$2","#endif // $1"],"description": "Code snippet for #if"},"struct": {"prefix": "struct","body": ["struct ${1:MyStruct} {","$2","};"],"description": "Code snippet for struct"},"switch": {"prefix": "switch","body": ["switch (${1:switch_on}) {","case ${2:A}:","$3","break;","default:","break;","}"],"description": "Code snippet for switch statement"},"try": {"prefix": "try","body": ["try {","$1","}","catch (const std::exception&) {","$2","}"],"description": "Code snippet for try catch"},"union": {"prefix": "union","body": ["union ${1:MyUnion} {","$2","};"],"description": "Code snippet for union"},"cout": {"prefix": "cout","body": ["std::cout << "${1:/* message */}" << std::endl;"],"description": "Code snippet for printing to std::cout, provided the header is set"},"#inc": {"prefix": "#inc","body": ["#include "$1""],"description": "Code snippet for #include " ""},"#inc<": {"prefix": "#inc<","body": ["#include <$1>"],"description": "Code snippet for #include < >"},"#def": {"prefix": "#def","body": ["#define $1 ($2)"],"description": "Code snippet for #define ( )"},"main": {"prefix": "main","body": ["int main(int argc, const char** argv) {","$1""return 0;","}"],"description": "Code snippet for main function"}}