Question

我试图在nodejs中创建一个程序，它可以等待用户输入，同时在屏幕上打印其他东西而不会弄乱一切。

使用以下代码：

setInterval( function (){
      console.log("just displaying some stuff");
},1000);
process.stdin.on("data", function(char) {
     console.log(char);
});

我得到以下结果：

just displaying some stuff
just displaying some stuff
'this is' just displaying some stuff
'in'just displaying some stuff
'put'just displaying some stuff

我正在寻找的结果是：

just displaying some stuff
just displaying some stuff
just displaying some stuff
just displaying some stuff
just displaying some stuff
'this is input'

有什么想法吗？我找不到任何有用的东西。

Answer 1

像rsp所说，祝福是一个很好的候选工具。这是您使用的示例实现。

我已经使用祝福来在屏幕底部创建一个文本框。屏幕的其余部分是＆＃39; body＆＃39;您的代码输出将被添加到哪里。这样，当您输入输入时，您的程序就不会像您所经历的那样混淆输出。

要尝试此操作，请运行Unable to generate the model because of the following exception: 'System.Data.Entity.Core.EntityCommandExecutionException: An error occurred while executing the command definition. See the inner exception for details. ---> System.Data.SqlClient.SqlException: The incoming tabular data stream (TDS) remote procedure call (RPC) protocol stream is incorrect. Too many parameters were provided in this RPC request. The maximum is 2100. at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData() at System.Data.SqlClient.SqlDataReader.get_MetaData() at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString, Boolean isInternal, Boolean forDescribeParameterEncryption) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, Boolean inRetry, SqlDataReader ds, Boolean describeParameterEncryptionRequest) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.<Reader>b__c(DbCommand t, DbCommandInterceptionContext`1 c) at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed) at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext) at System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(CommandBehavior behavior) at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) --- End of inner exception stack trace --- at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.Execute(EntityCommand entityCommand, CommandBehavior behavior) at System.Data.Entity.Core.EntityClient.EntityCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.Data.Entity.Design.VersioningFacade.ReverseEngineerDb.SchemaDiscovery.FunctionDetailsReader..ctor(EntityCommand command, Version storeSchemaModelVersion) at Microsoft.Data.Entity.Design.VersioningFacade.ReverseEngineerDb.SchemaDiscovery.EntityStoreSchemaGeneratorDatabaseSchemaLoader.LoadFunctionDetails(IEnumerable`1 filters) at Microsoft.Data.Entity.Design.VersioningFacade.ReverseEngineerDb.SchemaDiscovery.EntityStoreSchemaGeneratorDatabaseSchemaLoader.LoadStoreSchemaDetails(IList`1 filters) at Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelGenerator.GetStoreSchemaDetails(StoreSchemaConnectionFactory connectionFactory) at Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelGenerator.CreateStoreModel() at Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelGenerator.GenerateModel(List`1 errors) at Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelBuilderEngine.GenerateModels(String storeModelNamespace, ModelBuilderSettings settings, List`1 errors) at Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelBuilderEngine.GenerateModel(ModelBuilderSettings settings, IVsUtils vsUtils, ModelBuilderEngineHostContext hostContext)'. Loading metadata from the database took 00:00:00.4485064. Generating the model took 00:00:25.4756427.，然后在节点中运行此代码：

npm install blessed --save

这里的要点是：

您的代码应使用const blessed = require('blessed'); var screen = blessed.screen(); var body = blessed.box({ top: 0, left: 0, height: '100%-1', width: '100%', keys: true, mouse: true, alwaysScroll: true, scrollable: true, scrollbar: { ch: ' ', bg: 'red' } }); var inputBar = blessed.textbox({ bottom: 0, left: 0, height: 1, width: '100%', keys: true, mouse: true, inputOnFocus: true, style: { fg: 'white', bg: 'blue' // Blue background so you see this is different from body } }); // Add body to blessed screen screen.append(body); screen.append(inputBar); // Close the example on Escape, Q, or Ctrl+C screen.key(['escape', 'q', 'C-c'], (ch, key) => (process.exit(0))); // Handle submitting data inputBar.on('submit', (text) => { log(text); inputBar.clearValue(); }); // Add text to body (replacement for console.log) function log(text) { body.pushLine(text); screen.render(); } /* * Demonstration purposes */ // Listen for enter key and focus input then screen.key('enter', (ch, key) => { inputBar.focus(); }); // Log example output setInterval(() => { log("just displaying some stuff"); }, 1000);函数显示输出。将此视为log替代品。不再使用console.log功能，他们会搞乱有福的屏幕。
你必须关注＆＃39; console.*元素，以便接收输入。但是，你可以让它始终专注，但是我的演示显示了按住回车键或点击蓝色条来聚焦它。
如果您编写操作屏幕的代码，请记得运行inputBar以呈现更改。

Answer 2

你可以用ncurses或其他一些基于文本的UI库做类似的事情。在Node中，有一个名为blessed的优秀模块可以帮助您完成类似的事情。参见：

https://www.npmjs.com/package/blessed

它有一些很好的演示，有更复杂的用例：

在您的情况下，您可以创建一个窗口，将整个屏幕减去一行并在那里打印文本，同时在下面的第二个窗口中获取输入，如果需要，可以是一行或更高。

这比简单console.log()更复杂，但肯定是可能的，不要听那些告诉你不是的人。

输出时处理nodejs输入

2 个答案: