provider.collectTags((t, label) => {

        if (t === tagLower) {
          const tagLabel = open ? '<' + tagLower + '>' : '</' + tagLower + '>';
          hover = { contents: [{ language: 'html', value: tagLabel }, MarkedString.fromPlainText(label)], range };
        }
      });

 provider.collectAttributes(tag, (attr, type, documentation) => {
   if (attribute !== attr) {
     return;
   }
   const contents = [documentation ? MarkedString.fromPlainText(documentation) : `No doc for ${attr}`];
   hover = { contents, range };
 });

export function getJavascriptMode(htmlLanguageService: HTMLLanguageService, htmlDocuments: LanguageModelCache<HTMLDocument>): LanguageMode {
	let compilerOptions = { allowNonTsExtensions: true, allowJs: true, target: ts.ScriptTarget.Latest };
	let currentTextDocument: TextDocument;
	let host = {
		getCompilationSettings: () => compilerOptions,
		getScriptFileNames: () => [FILE_NAME],
		getScriptVersion: (fileName: string) => {
			if (fileName === FILE_NAME) {
				return String(currentTextDocument.version);
			}
			return '1'; // default lib is static
		},
		getScriptSnapshot: (fileName: string) => {
			let text = fileName === FILE_NAME ? currentTextDocument.getText() : DEFAULT_LIB.CONTENTS;
			return {
				getText: (start, end) => text.substring(start, end),
				getLength: () => text.length,
				getChangeRange: () => void 0
			};
		},
		getCurrentDirectory: () => '',
		getDefaultLibFileName: options => DEFAULT_LIB.NAME
	};
	let jsLanguageService = ts.createLanguageService(host);

	let jsDocuments = getLanguageModelCache<TextDocument>(10, 60, document => {
		return getEmbeddedDocument(htmlLanguageService, document, htmlDocuments.get(document), 'javascript');
	});
	let settings: any = {};

	return {
		configure(options: any) {
			settings = options && options.html;
		},
		doValidation(document: TextDocument): Diagnostic[] {
			currentTextDocument = jsDocuments.get(document);
			const diagnostics = jsLanguageService.getSyntacticDiagnostics(FILE_NAME);
			return diagnostics.map(diag => {
				return {
					range: convertRange(currentTextDocument, diag),
					severity: DiagnosticSeverity.Error,
					message: ts.flattenDiagnosticMessageText(diag.messageText, '\n')
				};
			});
		},
		doComplete(document: TextDocument, position: Position): CompletionList {
			currentTextDocument = jsDocuments.get(document);
			let offset = currentTextDocument.offsetAt(position);
			let completions = jsLanguageService.getCompletionsAtPosition(FILE_NAME, offset);
			if (!completions) {
				return { isIncomplete: false, items: [] };
			}
			let replaceRange = convertRange(currentTextDocument, getWordAtText(currentTextDocument.getText(), offset, JS_WORD_REGEX));
			return {
				isIncomplete: false,
				items: completions.entries.map(entry => {
					return {
						uri: document.uri,
						position: position,
						label: entry.name,
						sortText: entry.sortText,
						kind: convertKind(entry.kind),
						textEdit: TextEdit.replace(replaceRange, entry.name),
						data: { // data used for resolving item details (see 'doResolve')
							languageId: 'javascript',
							uri: document.uri,
							offset: offset
						}
					};
				})
			};
		},
		doResolve(document: TextDocument, item: CompletionItem): CompletionItem {
			currentTextDocument = jsDocuments.get(document);
			let details = jsLanguageService.getCompletionEntryDetails(FILE_NAME, item.data.offset, item.label);
			if (details) {
				item.detail = ts.displayPartsToString(details.displayParts);
				item.documentation = ts.displayPartsToString(details.documentation);
				delete item.data;
			}
			return item;
		},
		doHover(document: TextDocument, position: Position): Hover {
			currentTextDocument = jsDocuments.get(document);
			let info = jsLanguageService.getQuickInfoAtPosition(FILE_NAME, currentTextDocument.offsetAt(position));
			if (info) {
				let contents = ts.displayPartsToString(info.displayParts);
				return {
					range: convertRange(currentTextDocument, info.textSpan),
					contents: MarkedString.fromPlainText(contents)
				};
			}
			return null;
		},
		doSignatureHelp(document: TextDocument, position: Position): SignatureHelp {
			currentTextDocument = jsDocuments.get(document);
			let signHelp = jsLanguageService.getSignatureHelpItems(FILE_NAME, currentTextDocument.offsetAt(position));
			if (signHelp) {
				let ret: SignatureHelp = {
					activeSignature: signHelp.selectedItemIndex,
//.........这里部分代码省略.........