当使用VS CODE 时，如果窗口中打开的文件无法识别HTML的话，可以使用以下方法添加要识别的文件类型

找到该文件并修改\Microsoft VS Code\resources\app\extensions\html\package.json
{
"name": "html",
"version": "0.1.0",
"publisher": "vscode",
"engines": { "vscode": "*" },
"contributes": {
"languages": [{
"id": "html",
"extensions": [ ".html", ".htm", ".shtml", ".mdoc", ".jsp", ".asp", ".aspx", ".jshtm",".ejs"],
"aliases": [ "HTML", "htm", "html", "xhtml","ejs"],
"mimetypes": ["text/html", "text/x-jshtm", "text/template", "text/ng-template"]
}],
"grammars": [{
/* "language": "html", not yet enabled*/
"scopeName": "text.html.basic",
"path": "./syntaxes/HTML.plist"
}]
}
}