diff --git a/basic/01-web3js-deploy/index.js b/basic/01-web3js-deploy/index.js
index 91e267fb2..90c253a74 100644
--- a/basic/01-web3js-deploy/index.js
+++ b/basic/01-web3js-deploy/index.js
@@ -1,42 +1,40 @@
-let Web3 = require("web3");
-let solc = require("solc");
-let fs = require("fs");
+let Web3 = require('web3');
+let solc = require('solc');
+let fs = require('fs');
 
 // Get privatekey from sk.txt
-require("dotenv").config();
+require('dotenv').config();
 const privatekey = process.env.PRIVATE_KEY;
 
 // Load contract
-const source = fs.readFileSync("Incrementer.sol", "utf8");
+const source = fs.readFileSync('Incrementer.sol', 'utf8');
 
 // compile solidity
 const input = {
-  language: "Solidity",
+  language: 'Solidity',
   sources: {
-    "Incrementer.sol": {
+    'Incrementer.sol': {
       content: source,
     },
   },
   settings: {
     outputSelection: {
-      "*": {
-        "*": ["*"],
+      '*': {
+        '*': ['*'],
       },
     },
   },
 };
 
 const tempFile = JSON.parse(solc.compile(JSON.stringify(input)));
-const contractFile = tempFile.contracts["Incrementer.sol"]["Incrementer"];
+const contractFile = tempFile.contracts['Incrementer.sol']['Incrementer'];
 
 // Get bin & abi
 const bytecode = contractFile.evm.bytecode.object;
 const abi = contractFile.abi;
 
 // Create web3 with kovan provider，you can fix kovan to other testnet
-const web3 = new Web3(
-  "https://kovan.infura.io/v3/" + process.env.INFURA_ID
-);
+const web3 = new Web3('https://kovan.infura.io/v3/' + process.env.INFURA_ID);
 
 // Create account from privatekey
 const account = web3.eth.accounts.privateKeyToAccount(privatekey);
diff --git a/basic/02-web3js-transaction/compile.js b/basic/02-web3js-transaction/compile.js
index fc0037984..992b16c9e 100644
--- a/basic/02-web3js-transaction/compile.js
+++ b/basic/02-web3js-transaction/compile.js
@@ -2,27 +2,28 @@ const fs = require('fs');
 const solc = require('solc');
 
 // 以 utf8 方式加载合约
-const source = fs.readFileSync('Incrementer.sol','utf8');
+const source = fs.readFileSync('Incrementer.sol', 'utf8');
 
 // 编译合约
 const input = {
-   language: 'Solidity',
-   sources: {
-      'Incrementer.sol': {
-         content: source,
+  language: 'Solidity',
+  sources: {
+    'Incrementer.sol': {
+      content: source,
+    },
+  },
+  settings: {
+    outputSelection: {
+      '*': {
+        '*': ['*'],
       },
-   },
-   settings: {
-      outputSelection: {
-         '*': {
-            '*': ['*'],
-         },
-      },
-   },
+    },
+  },
 };
 
 const tempFile = JSON.parse(solc.compile(JSON.stringify(input)));
-const contractOfIncrementer = tempFile.contracts['Incrementer.sol']['Incrementer'];
+const contractOfIncrementer =
+  tempFile.contracts['Incrementer.sol']['Incrementer'];
 
 // 导出合约数据，可以使用 console 打印 contractFile 中的具体内容信息
 module.exports = contractOfIncrementer;
diff --git a/basic/02-web3js-transaction/index.js b/basic/02-web3js-transaction/index.js
index 8d043e769..f2202bcbe 100644
--- a/basic/02-web3js-transaction/index.js
+++ b/basic/02-web3js-transaction/index.js
@@ -1,8 +1,8 @@
-const Web3 = require("web3");
-const fs = require("fs");
-const contractOfIncrementer = require("./compile");
+const Web3 = require('web3');
+const fs = require('fs');
+const contractOfIncrementer = require('./compile');
 
-require("dotenv").config();
+require('dotenv').config();
 const privatekey = process.env.PRIVATE_KEY;
 
 /*
@@ -10,8 +10,8 @@ const privatekey = process.env.PRIVATE_KEY;
 */
 // Provider
 const providerRPC = {
-  development: "https://kovan.infura.io/v3/" + process.env.INFURA_ID,
-  moonbase: "https://rpc.testnet.moonbeam.network",
+  development: 'https://kovan.infura.io/v3/' + process.env.INFURA_ID,
+  moonbase: 'https://rpc.testnet.moonbeam.network',
 };
 const web3 = new Web3(providerRPC.development); //Change to correct network
 
@@ -34,7 +34,7 @@ const abi = contractOfIncrementer.abi;
 
 */
 const Trans = async () => {
-  console.log("============================ 1. Deploy Contract");
+  console.log('============================ 1. Deploy Contract');
   console.log(`Attempting to deploy from account ${account.address}`);
 
   // Create Contract Instance
@@ -74,7 +74,7 @@ const Trans = async () => {
   // Create the contract with contract address
   console.log();
   console.log(
-    "============================ 2. Call Contract Interface getNumber"
+    '============================ 2. Call Contract Interface getNumber'
   );
   let incrementer = new web3.eth.Contract(abi, createReceipt.contractAddress);
 
@@ -88,7 +88,7 @@ const Trans = async () => {
   // Add 3 to Contract Public Variable
   console.log();
   console.log(
-    "============================ 3. Call Contract Interface increment"
+    '============================ 3. Call Contract Interface increment'
   );
   const _value = 3;
   let incrementTx = incrementer.methods.increment(_value);
@@ -121,7 +121,7 @@ const Trans = async () => {
    *
    */
   console.log();
-  console.log("============================ 4. Call Contract Interface reset");
+  console.log('============================ 4. Call Contract Interface reset');
   const resetTx = incrementer.methods.reset();
 
   const resetTransaction = await web3.eth.accounts.signTransaction(
@@ -149,26 +149,26 @@ const Trans = async () => {
    *
    */
   console.log();
-  console.log("============================ 5. Listen to Events");
-  console.log(" Listen to Increment Event only once && continuouslly");
+  console.log('============================ 5. Listen to Events');
+  console.log(' Listen to Increment Event only once && continuouslly');
 
   // kovan don't support http protocol to event listen, need to use websocket
   // more details , please refer to  https://medium.com/blockcentric/listening-for-smart-contract-events-on-public-blockchains-fdb5a8ac8b9a
   const web3Socket = new Web3(
     new Web3.providers.WebsocketProvider(
-      "wss://kovan.infura.io/ws/v3/" + process.env.INFURA_ID
+      'wss://kovan.infura.io/ws/v3/' + process.env.INFURA_ID
     )
   );
   incrementer = new web3Socket.eth.Contract(abi, createReceipt.contractAddress);
 
   // listen to  Increment event only once
-  incrementer.once("Increment", (error, event) => {
-    console.log("I am a onetime event listner, I am going to die now");
+  incrementer.once('Increment', (error, event) => {
+    console.log('I am a onetime event listner, I am going to die now');
   });
 
   // listen to Increment event continuouslly
   incrementer.events.Increment(() => {
-    console.log("I am a longlive event listner, I get a event now");
+    console.log('I am a longlive event listner, I get a event now');
   });
 
   for (let step = 0; step < 3; step++) {
@@ -186,7 +186,7 @@ const Trans = async () => {
     if (step == 2) {
       // clear all the listeners
       web3Socket.eth.clearSubscriptions();
-      console.log("Clearing all the events listeners !!!!");
+      console.log('Clearing all the events listeners !!!!');
     }
   }
 
@@ -199,10 +199,10 @@ const Trans = async () => {
    *
    */
   console.log();
-  console.log("============================ 6. Going to get past events");
-  const pastEvents = await incrementer.getPastEvents("Increment", {
+  console.log('============================ 6. Going to get past events');
+  const pastEvents = await incrementer.getPastEvents('Increment', {
     fromBlock: deployedBlockNumber,
-    toBlock: "latest",
+    toBlock: 'latest',
   });
 
   pastEvents.map((event) => {
@@ -218,7 +218,7 @@ const Trans = async () => {
    *
    */
   console.log();
-  console.log("============================ 7. Check the transaction error");
+  console.log('============================ 7. Check the transaction error');
   incrementTx = incrementer.methods.increment(0);
   incrementTransaction = await web3.eth.accounts.signTransaction(
     {
@@ -232,7 +232,7 @@ const Trans = async () => {
   const receipt = null;
   receipt = await web3.eth
     .sendSignedTransaction(incrementTransaction.rawTransaction)
-    .on("error", console.error);
+    .on('error', console.error);
 };
 
 Trans()
diff --git a/basic/03-web3js-erc20/compile.js b/basic/03-web3js-erc20/compile.js
index 23d2ca2db..ec3323109 100644
--- a/basic/03-web3js-erc20/compile.js
+++ b/basic/03-web3js-erc20/compile.js
@@ -2,29 +2,27 @@ const fs = require('fs');
 const solc = require('solc');
 
 // Get Path and Load Contract
-const source = fs.readFileSync('SimpleToken.sol','utf8');
+const source = fs.readFileSync('SimpleToken.sol', 'utf8');
 
 // Compile Contract
 const input = {
-   language: 'Solidity',
-   sources: {
-      'SimpleToken.sol': {
-         content: source,
+  language: 'Solidity',
+  sources: {
+    'SimpleToken.sol': {
+      content: source,
+    },
+  },
+  settings: {
+    outputSelection: {
+      '*': {
+        '*': ['*'],
       },
-   },
-   settings: {
-      outputSelection: {
-         '*': {
-            '*': ['*'],
-         },
-      },
-   },
+    },
+  },
 };
 
-
 const tempFile = JSON.parse(solc.compile(JSON.stringify(input)));
 const contractFile = tempFile.contracts['SimpleToken.sol']['SimpleToken'];
 
-
 // Export Contract Data
 module.exports = contractFile;
diff --git a/basic/03-web3js-erc20/index.js b/basic/03-web3js-erc20/index.js
index 80bcf88e8..40bc52093 100644
--- a/basic/03-web3js-erc20/index.js
+++ b/basic/03-web3js-erc20/index.js
@@ -1,23 +1,27 @@
 const Web3 = require('web3');
-const fs = require("fs");
+const fs = require('fs');
 const contractFile = require('./compile');
 
-require('dotenv').config()
+require('dotenv').config();
 const privatekey = process.env.PRIVATE_KEY;
 /*
    -- Define Provider & Variables --
 */
 
-const receiver = "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266"
+const receiver = '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266';
 
 // Provider
-const web3 = new Web3(new Web3.providers.HttpProvider('https://kovan.infura.io/v3/' + process.env.INFURA_ID));
+const web3 = new Web3(
+  new Web3.providers.HttpProvider(
+    'https://kovan.infura.io/v3/' + process.env.INFURA_ID
+  )
+);
 
 //account
-const  account = web3.eth.accounts.privateKeyToAccount(privatekey);
+const account = web3.eth.accounts.privateKeyToAccount(privatekey);
 const account_from = {
-   privateKey: account.privateKey,
-   accountaddress: account.address,
+  privateKey: account.privateKey,
+  accountaddress: account.address,
 };
 
 // sol ---> abi + bin
@@ -28,73 +32,80 @@ const abi = contractFile.abi;
    -- Deploy Contract --
 */
 const Trans = async () => {
-   console.log(`Attempting to deploy from account ${account_from.accountaddress}`);
-   web3.eth.getBlockNumber(function (error, result) {
-      console.log(result)
-   })
-   // Create deploy Contract Instance
-   const deployContract = new web3.eth.Contract(abi);
-
-// method 1
-   // Create Constructor Tx
-   const deployTx = deployContract.deploy({
-      data: bytecode,
-      arguments: ["DAPPLEARNING","DAPP",0,10000000],
-   });
-
-   // Sign Transacation and Send
-   const deployTransaction = await web3.eth.accounts.signTransaction(
-      {
-         data: deployTx.encodeABI(),
-         gas: "8000000",
-      },
-      account_from.privateKey
-   );
-
-   // Send Tx and Wait for Receipt
-   const deployReceipt = await web3.eth.sendSignedTransaction(
-      deployTransaction.rawTransaction
-   );
-   console.log(
-      `Contract deployed at address: ${deployReceipt.contractAddress}`
-   );
-
-   // method 2 infura not support
-//    const deployTx2 = await deployContract.deploy({
-//       data: bytecode,
-//       arguments: ["hello","Dapp",1,100000000],
-//    }).send({
-//       from: '0x54A65DB20D7653CE509d3ee42656a8F138037d51',
-//       gas: 1500000,
-//       gasPrice: '30000000000000'}).
-//       then(function(newContractInstance){
-//       console.log(newContractInstance.options.address) // instance with the new contract address
-//    });
-
-   const erc20Contract = new web3.eth.Contract(abi, deployReceipt.contractAddress);
-
-
-   //build the Tx
-   const transferTx = erc20Contract.methods.transfer(receiver,100000).encodeABI();
-
-   // Sign Tx with PK
-   const transferTransaction = await web3.eth.accounts.signTransaction(
-       {
-          to: deployReceipt.contractAddress,
-          data: transferTx,
-          gas: 8000000,
-       },
-       account_from.privateKey
-   );
-
-   // Send Tx and Wait for Receipt
-   const transferReceipt = await web3.eth.sendSignedTransaction(
-      transferTransaction.rawTransaction
-   );
-
-   erc20Contract.methods.balanceOf(receiver).call().then((result)=>{
+  console.log(
+    `Attempting to deploy from account ${account_from.accountaddress}`
+  );
+  web3.eth.getBlockNumber(function (error, result) {
+    console.log(result);
+  });
+  // Create deploy Contract Instance
+  const deployContract = new web3.eth.Contract(abi);
+
+  // method 1
+  // Create Constructor Tx
+  const deployTx = deployContract.deploy({
+    data: bytecode,
+    arguments: ['DAPPLEARNING', 'DAPP', 0, 10000000],
+  });
+
+  // Sign Transacation and Send
+  const deployTransaction = await web3.eth.accounts.signTransaction(
+    {
+      data: deployTx.encodeABI(),
+      gas: '8000000',
+    },
+    account_from.privateKey
+  );
+
+  // Send Tx and Wait for Receipt
+  const deployReceipt = await web3.eth.sendSignedTransaction(
+    deployTransaction.rawTransaction
+  );
+  console.log(`Contract deployed at address: ${deployReceipt.contractAddress}`);
+
+  // method 2 infura not support
+  //    const deployTx2 = await deployContract.deploy({
+  //       data: bytecode,
+  //       arguments: ["hello","Dapp",1,100000000],
+  //    }).send({
+  //       from: '0x54A65DB20D7653CE509d3ee42656a8F138037d51',
+  //       gas: 1500000,
+  //       gasPrice: '30000000000000'}).
+  //       then(function(newContractInstance){
+  //       console.log(newContractInstance.options.address) // instance with the new contract address
+  //    });
+
+  const erc20Contract = new web3.eth.Contract(
+    abi,
+    deployReceipt.contractAddress
+  );
+
+  //build the Tx
+  const transferTx = erc20Contract.methods
+    .transfer(receiver, 100000)
+    .encodeABI();
+
+  // Sign Tx with PK
+  const transferTransaction = await web3.eth.accounts.signTransaction(
+    {
+      to: deployReceipt.contractAddress,
+      data: transferTx,
+      gas: 8000000,
+    },
+    account_from.privateKey
+  );
+
+  // Send Tx and Wait for Receipt
+  const transferReceipt = await web3.eth.sendSignedTransaction(
+    transferTransaction.rawTransaction
+  );
+
+  erc20Contract.methods
+    .balanceOf(receiver)
+    .call()
+    .then((result) => {
       console.log(`The balance of receiver is ${result}`);
-   })
+    });
 };
 
 Trans()
@@ -102,4 +113,4 @@ Trans()
   .catch((error) => {
     console.error(error);
     process.exit(1);
-  });
\ No newline at end of file
+  });
diff --git a/prettier.config.js b/prettier.config.js
new file mode 100644
index 000000000..5a00e77dc
--- /dev/null
+++ b/prettier.config.js
@@ -0,0 +1,25 @@
+// for more details https://prettier.io/docs/en/configuration.html
+// prettier.config.js or .prettierrc.js
+module.exports = {
+  trailingComma: 'es5',
+  tabWidth: 2,
+  Tabs: false,
+  overrides: [
+    {
+      files: ['*.js', '*.ts'],
+      options: {
+        semi: true,
+        singleQuote: true,
+      },
+    },
+    // solidity
+    {
+      files: '*.sol',
+      options: {
+        semi: false,
+        tabWidth: 4,
+        printWidth: 120,
+      },
+    },
+  ],
+};