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node.js - Node : use eventEmitter object globally

假设我有3个公开的功能:用户、帖子、文章所有这些都需要将消息发送到一个名为mediator的文件,其中设置了所有事件。目前我在这样做时遇到了麻烦在中介文件中我有这样的东西:varEventEmitter=require('events').EventEmitter;,pubsub=newEventEmitter();exports.pubsub=newEventEmitter()pubsub.on('loggedIn',function(msg){console.log(msg);});在用户、帖子和文章功能中。像这样:varmediator=require('../config/me

node.js - Node : use eventEmitter object globally

假设我有3个公开的功能:用户、帖子、文章所有这些都需要将消息发送到一个名为mediator的文件,其中设置了所有事件。目前我在这样做时遇到了麻烦在中介文件中我有这样的东西:varEventEmitter=require('events').EventEmitter;,pubsub=newEventEmitter();exports.pubsub=newEventEmitter()pubsub.on('loggedIn',function(msg){console.log(msg);});在用户、帖子和文章功能中。像这样:varmediator=require('../config/me

Python pip install 安装包报错ERROR: Could not find a version that satisfies the requirement XXX解决方法

Pythonpipinstall安装包报错ERROR:CouldnotfindaversionthatsatisfiestherequirementXXX解决方法文章目录Pythonpipinstall安装包报错ERROR:CouldnotfindaversionthatsatisfiestherequirementXXX解决方法一、问题二、原因三、解决办法一、问题使用pip安装python包时,经常会出现如下错误:ERROR:Couldnotfindaversionthatsatisfiestherequirementxxxx(fromversions:none)ERROR:Nomatchi

Python pip install 安装包报错ERROR: Could not find a version that satisfies the requirement XXX解决方法

Pythonpipinstall安装包报错ERROR:CouldnotfindaversionthatsatisfiestherequirementXXX解决方法文章目录Pythonpipinstall安装包报错ERROR:CouldnotfindaversionthatsatisfiestherequirementXXX解决方法一、问题二、原因三、解决办法一、问题使用pip安装python包时,经常会出现如下错误:ERROR:Couldnotfindaversionthatsatisfiestherequirementxxxx(fromversions:none)ERROR:Nomatchi

node.js - 将 ApolloClient 与 node.js 一起使用。 "fetch is not found globally and no fetcher passed"

我正在尝试在node.js服务器上使用Apollo客户端来使用以下代码与另一个GraphQLAPI进行交互:importfetchfrom'node-fetch'import{createHttpLink}from'apollo-link-http'importApolloClientfrom'apollo-boost'import{API_URL}from'...'constclient=newApolloClient({link:createHttpLink({uri:API_URL,fetch:fetch,}),})这会产生以下错误:moduleinitializationerr

node.js - 将 ApolloClient 与 node.js 一起使用。 "fetch is not found globally and no fetcher passed"

我正在尝试在node.js服务器上使用Apollo客户端来使用以下代码与另一个GraphQLAPI进行交互:importfetchfrom'node-fetch'import{createHttpLink}from'apollo-link-http'importApolloClientfrom'apollo-boost'import{API_URL}from'...'constclient=newApolloClient({link:createHttpLink({uri:API_URL,fetch:fetch,}),})这会产生以下错误:moduleinitializationerr

node.js - 为什么 require ('underscore' ) 在 node.js REPL 上执行时返回 undefined?

当我在控制台中运行node并键入var_=require('underscore');时,_最终未定义。如果我将相同的代码放在一个文件中并执行它,下划线库会按预期包含在内。$node>var_=require('underscore');>console.log(_)undefined//underscorelibrarydoesnotload>varasync=require('async');undefined>console.log(async)//asynclibrarydoes{noConflict:[Function],nextTick:[Function],forEach

node.js - 为什么 require ('underscore' ) 在 node.js REPL 上执行时返回 undefined?

当我在控制台中运行node并键入var_=require('underscore');时,_最终未定义。如果我将相同的代码放在一个文件中并执行它,下划线库会按预期包含在内。$node>var_=require('underscore');>console.log(_)undefined//underscorelibrarydoesnotload>varasync=require('async');undefined>console.log(async)//asynclibrarydoes{noConflict:[Function],nextTick:[Function],forEach

node.js - 错误 : Couldn't find preset "react" when installed using npm install --global babel-preset-react but works without global flag

我使用npminstall--globalbabel-cli安装了BabelCLI(版本6)。然后我使用npminstall--globalbabel-preset-react安装react预设。然后我将项目目录中的.babelrc文件设置为{"presets":["react"]}当我尝试构建JSX文件时,它失败了Error:Couldn'tfindpreset"react"atOptionManager.mergePresets(/usr/local/lib/node_modules/babel-cli/node_modules/babel-core/lib/transformat

node.js - 错误 : Couldn't find preset "react" when installed using npm install --global babel-preset-react but works without global flag

我使用npminstall--globalbabel-cli安装了BabelCLI(版本6)。然后我使用npminstall--globalbabel-preset-react安装react预设。然后我将项目目录中的.babelrc文件设置为{"presets":["react"]}当我尝试构建JSX文件时,它失败了Error:Couldn'tfindpreset"react"atOptionManager.mergePresets(/usr/local/lib/node_modules/babel-cli/node_modules/babel-core/lib/transformat