# starknet.js

**Published by:** [jonneyhu.eth](https://paragraph.com/@jonneyhu/)
**Published on:** 2022-08-05
**URL:** https://paragraph.com/@jonneyhu/starknet-js

## Content

入门# use the main branch npm install starknet # to use latest features (merges in develop branch) npm install starknet@next 通过 Provider 对象，您可以定义要使用的网络。import {Provider} from 'starknet'; 将您的 DAPP 连接到 Starknetconst provider = new Provider({sequencer: { network: constants.NetworkName.SN_MAIN } }) 将您的 DAPP 连接到私有 Starknetconst provider = new Provider({ sequencer: { baseUrl: 'https://mynetwork.mycompany.io', feederGatewayUrl: 'feeder_gateway', gatewayUrl: 'gateway', } })} 具体RPCimport { RpcProvider } from "starknet"; const providerRPC = new RpcProvider({ nodeUrl: "http://192.168.1.99:9545" }); // for a pathfinder node located in a PC in the local network const pendingTx = await providerRPC.getPendingTransactions();} 连接到现有帐户一旦您的提供商初始化，您就可以连接现有帐户。 你需要2条数据：账户地址该账户的私钥// initialize provider const provider = new Provider({ sequencer: { baseUrl:"http://127.0.0.1:5050" } }); // initialize existing pre-deployed account 0 of Devnet const privateKey = "0xe3e70682c2094cac629f6fbed82c07cd"; const accountAddress = "0x7e00d496e324876bbc8531f2d9a82bf154d1a04a50218ee74cdd372f75a551a"; const account = new Account(provider, accountAddress, privateKey);} 连接已部署的合约import fs from "fs"; const compressedContract = await provider.getClassAt(addrContract); fs.writeFileSync('./myAbi.json', json.stringify( compressedContract.abi, undefined, 2)); // initialize provider const provider = new Provider({ sequencer: { network: constants.NetworkName.SN_GOERLI } }); // initialize deployed contract const testAddress = "0x7667469b8e93faa642573078b6bf8c790d3a6184b2a1bb39c5c923a732862e1"; const compiledTest = json.parse(fs.readFileSync("./compiledContracts/test.json").toString("ascii")); // connect the contract const myTestContract = new Contract(compiledTest.abi, testAddress, provider);} 与合约交互 要读取余额，您需要连接提供商和合约。你必须使用元类方法来调用Starknet：（contract.function_name(params)这里params没有必要，因为该get_balance函数没有参数）。import { Provider, Contract, Account, ec, json } from "starknet"; //initialize Provider const provider = new Provider({ sequencer: { network: constants.NetworkName.SN_GOERLI } }); // Connect the deployed Test contract in Tesnet const testAddress = "0x5f7cd1fd465baff2ba9d2d1501ad0a2eb5337d9a885be319366b5205a414fdd"; // read abi of Test contract const { abi: testAbi } = await provider.getClassAt(testAddress); if (testAbi === undefined) { throw new Error("no abi.") }; const myTestContract = new Contract(testAbi, testAddress, provider); // Interaction with the contract with call const bal1 = await myTestContract.get_balance(); console.log("Initial balance =", bal1.res.toString()); // .res because the return value is called 'res' in the Cairo 0 contract. // With Cairo 1 contract, the result value is in bal1, as bigint. 使用元类//initialize Provider const provider = new Provider({ sequencer: { network: constants.NetworkName.SN_GOERLI } }); // connect your account. To adapt to your own account: const privateKey0 = process.env.OZ_ACCOUNT_PRIVATE_KEY; const account0Address = "0x123....789"; const account0 = new Account(provider, account0Address, privateKey0); // add ,"1" after privateKey0 if this account is not a Cairo 0 contract // Connect the deployed Test contract in Tesnet const testAddress = "0x5f7cd1fd465baff2ba9d2d1501ad0a2eb5337d9a885be319366b5205a414fdd"; // read abi of Test contract const { abi: testAbi } = await provider.getClassAt(testAddress); if (testAbi === undefined) { throw new Error("no abi.") }; const myTestContract = new Contract(testAbi, testAddress, provider); // Connect account with the contract myTestContract.connect(account0); // Interactions with the contract with meta-class const bal1 = await myTestContract.get_balance(); console.log("Initial balance =", bal1.res.toString()); // Cairo 0 contract // increase_balance needs 2 felts, to add them to the balance. const myCall = myTestContract.populate("increase_balance", [10,30]); const res = await myTestContract.increase_balance(myCall.calldata); await provider.waitForTransaction(res.transaction_hash); const bal2 = await myTestContract.get_balance(); console.log("Final balance =", bal2.res.toString());

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