Callbacks Promises Events
To help web3 integrate into all kind of projects with different standards we provide multiple ways to act on asynchronous functions. Most web3.js objects allow a callback as the last parameter, as well as returning promises to chain functions. Ethereum as a blockchain has different levels of finality and therefore needs to return multiple “stages” of an action. To cope with requirement we return a “promiEvent” for functions like web3.eth.sendTransaction or contract methods. This “promiEvent” ...
Callbacks Promises Events
To help web3 integrate into all kind of projects with different standards we provide multiple ways to act on asynchronous functions. Most web3.js objects allow a callback as the last parameter, as well as returning promises to chain functions. Ethereum as a blockchain has different levels of finality and therefore needs to return multiple “stages” of an action. To cope with requirement we return a “promiEvent” for functions like web3.eth.sendTransaction or contract methods. This “promiEvent” ...
Web3.js 入门
web3.js 库是一系列模块的集合,服务于以太坊生态系统的各个功能,如:web3-eth 用来与以太坊区块链及合约的交互;web3-shh Whisper 协议相关,进行p2p通信和广播;web3-bzz swarm 协议(去中心化文件存储)相关;web3-utils 包含一些对 DApp 开发者有用的方法。引入web3.js首先,需要将 web3.js 引入到项目中。 可以使用以下方法来完成:npm: npm install web3meteor: meteor add ethereum:web3pure js: link the dist/web3.min.js然后你需要创建一个 web3 的实例,设置一个 provider。 支持以太坊的浏览器如 Mist 或 MetaMask 会有提供一个 ethereumProvider 或 web3.currentProvider 。 对于 web3.js 来说,可以检查 Web3.givenProvider ,如果属性为 null 再连接本地或远程的节点。// in node.js use: var Web3 = require(...
Web3.js 入门
web3.js 库是一系列模块的集合,服务于以太坊生态系统的各个功能,如:web3-eth 用来与以太坊区块链及合约的交互;web3-shh Whisper 协议相关,进行p2p通信和广播;web3-bzz swarm 协议(去中心化文件存储)相关;web3-utils 包含一些对 DApp 开发者有用的方法。引入web3.js首先,需要将 web3.js 引入到项目中。 可以使用以下方法来完成:npm: npm install web3meteor: meteor add ethereum:web3pure js: link the dist/web3.min.js然后你需要创建一个 web3 的实例,设置一个 provider。 支持以太坊的浏览器如 Mist 或 MetaMask 会有提供一个 ethereumProvider 或 web3.currentProvider 。 对于 web3.js 来说,可以检查 Web3.givenProvider ,如果属性为 null 再连接本地或远程的节点。// in node.js use: var Web3 = require(...