如何查找VisualStudioCode的设置变量参考文档？（例如：$fileName，$fileNameWithoutExt）

1. 在 Visual Studio Code 中打开命令面板（快捷键是Ctrl+Shift+P或者Cmd+Shift+P）；
2. 输入 “Open User Settings” 并选择该选项；
3. 在打开的用户设置文件中，点击右上角的小链接“Edit in settings.json”进入 settings.json 文件；
4. 在 settings.json 文件中，可以查找所有可用的设置变量，包括 $fileName 和 $fileNameWithoutExt。例如：

{
    "editor.insertSpaces": true,
    "editor.tabSize": 4,
    "editor.wordWrap": "wordWrapColumn",
    "workbench.activityBar.visible": true,
    "workbench.colorTheme": "Atom One Light",
    "window.title": "${dirty}${activeEditorShort}${separator}${rootName}",
    "terminal.integrated.shell.windows": "C:\\WINDOWS\\System32\\cmd.exe",
    "files.autoSave": "afterDelay",
    "files.defaultLanguage": "${activeEditorLanguage}",
    "files.exclude": {
        "**/.git": true,
        "**/.svn": true,
        "**/.hg": true,
        "**/CVS": true,
        "**/*.sublime-*": true,
        "**/node_modules": true,
        "**/bower_components": true,
        "**/*.js.map": true
    },
    "files.associations": {
        "*.js": "javascript",
        "*.jsx": "javascriptreact"
    },
    "breadcrumbs.enabled": true,
    "editor.parameterHints": true,
    "editor.quickSuggestions": true,
    "editor.suggestOnTriggerCharacters": true,
    "editor.useTabStops": true,
    "editor.scrollBeyondLastColumn": 5,
    "editor.snippetSuggestions": "top",
    "editor.multiCursorModifier": "alt",
    "editor.lineNumbers": "on",
    "editor.lineHeight": 0,
    "editor.fontFamily": "Monaco, Menlo, 'Courier New', monospace, 'Droid Sans Mono', 'Consolas'",
    "editor.fontSize": 12,
    "editor.formatOnPaste": true,
    "editor.formatOn