npm | 易学教程

SimpleChain Dapp开发入门实例

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SimpleChian技术社区最近准备举办开发挑战赛，很多社区老铁都跃跃欲试想基于SimpleChain开发Dapp应用。鉴于此种情况，本期我们就来聊一下如何基于SimpleChain开发Dapp。下面是开发Dapp开发的详细过程，流程梳理如下：环境准备除了Mac电脑，还需要安装SimpleChain开发的相关环境。环境如下: nodejs truffle solidity testrpc 另外，教程中还会用到webpack，安装教程网上也有很多。这部分如果不熟悉的话请自行查阅学习下。编写智能合约前面我们已经安装了 truffle ,我们只需要在电脑的项目目录下新建conference目录，进入目录执行truffle init，就可以使用truffle这个Dapp前端框架来初始化自己的项目。执行完后建立如下的子目录和文件: contracts/: 智能合约存放的目录，默认情况下已经帮你创建 Migrations.sol合约。 migrations/: 存放部署脚本 test/: 存放测试脚本 truffle.js: truffle的配置文件修改truffle.js文件，改成如下: module.exports = { networks: { development: { host: "localhost", port: 8545, network_id: "*" //

@angular-cli install fails with deprecated request@2.88.2: request has been deprecated (mac)

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问题 After updating node.js and npm to current LTS: node -v v12.16.0 npm -v 6.13.4 When I'm trying to install @angular-cli following the steps in the documentation, running npm install -g @angular/cli in the terminal stops the installation and the console output is: npm install -g @angular/cli npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142 /Users/user/.npm-global/bin/ng -> /USERS/USER/.npm-global/lib/node_modules/@angular/cli/bin

@angular-cli install fails with deprecated request@2.88.2: request has been deprecated (mac)

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Preparing a React component to publish on npm

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问题 I have a component that I want to publish in npm, I tested simply by importing it from the components folder in the project. I managed to publish it, but now I get: ERROR in ./node_modules/@ / /index.js Module parse failed: Unexpected token (11:8) You may need an appropriate loader to handle this file type. My index.js is as follows: import React from "react" import Main from "./bootstrap/containers/main" export default class BootstrapTable extends React.Component { constructor(props) { super

“composeEnhancers” is not a function in ReactJS

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问题 I am getting the below error in my code: TypeError: composeEnhancers is not a function const store = createStore(rootReducer, composeEnhancers( applyMiddleware(thunk) )); Can anyone see where the issue lies here? I don't understand as I have just copied my ReactJS instructor's code and he doesn't get this error, yet I do. My whole code is shown here: import React from 'react'; import ReactDOM from 'react-dom'; import { BrowserRouter } from 'react-router-dom'; import { Provider } from 'react

package.json must be actual JSON, not just JavaScript

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问题 I used http://jsonlint.com/ to check the syntax for this package.json file { "name": "hello-world", "description": "hello world test app", "version": "0.0.1", "private": true, "dependencies": { "express": “4.6.1" } } it returns the error Parse error on line 7: ... "express": “4.6.1" }} ----------------------^ Expecting 'STRING', 'NUMBER', 'NULL', 'TRUE', 'FALSE', '{', '[' not sure what is wrong with this. terminal is throwing the error for using npm install "Failed to parse package.json data.

npm posttest doesn't trigger if npm test fails

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问题 Is there a way to trigger npm's posttest when test fails? If package.json contains "scripts": { "pretest": "echo pretest", "test": "some_failed_test_or_error", "posttest": "echo posttest" } $ npm test will echo "pretest" but not "posttest". I get the same behavior if I use mocha and a test fails, even if mocha doesn't trigger any exceptions (just some simple failure assert(true==false) ). I'm launching a resource on pretest, and I'd like to kill the resource on posttest, whether the test

socket.io sets cross-site cookie without same-site attribute

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问题 I have a socket.io application and recently I got this warning: A cookie associated with a cross-site resource at URL was set without the SameSite attribute. A future release of Chrome will only deliver cookies with cross-site requests if they are set with SameSite=None and Secure . You can review cookies in developer tools under Application>Storage>Cookies and see more details at https://www.chromestatus.com/feature/5088147346030592 and https://www.chromestatus.com/feature/5633521622188032.`

I can't install react using npx create-react-app?

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问题 I am trying to use npx create-react app but i have errors that is shown below: npm ERR! Unexpected end of Json input while parsing near '...eact-app/-/create-rea' npm ERR! A complete log of this run can be found in: npm ERR! C:\Users\dp\AppData\Roaming\npm-cache\_logs\2018-12-06T18-42-56-293Z-debug.log Install for create-react-app@latest failed with code 1** and the log file of the error is here...! How I can get rid of this trouble?? 0 info it worked if it ends with ok 1 verbose cli [ 'C:\

npm WARN bootstrap@4.2.1 requires a peer of jquery@1.9.1 - 3 but none is installed

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问题 I tried to install bootstrap in my Angular Project by npm install --g bootstrap but i am getting following warning npm WARN bootstrap@4.2.1 requires a peer of jquery@1.9.1 - 3 but none is installed. You must install peer dependencies yourself. npm WARN bootstrap@4.2.1 requires a peer of popper.js@^1.14.6 but none is installed. You must install peer dependencies yourself. I am using following version of ng and npm Angular CLI: 7.1.4 Node: 10.15.0 OS: win32 x64 Angular: 7.1.4 ... animations,