탈중앙화 eBay 개발!: 실리콘밸리 개발자와 함께대시보드

import Web3 from "web3"; import "./app.css"; import ecommerceStoreArtifact from "../../build/contracts/EcommerceStore.json"; var EcommerceStore = contract(ecommerce_store_artifacts); const App = {   web3: null,   account: null,   start: async function() {     const { web3 } = this;     try {       // get contract instance       const networkId = await web3.eth.net.getId();       const deployedNetwork = ecommerceStoreArtifact.networks[networkId];       this.meta = new web3.eth.Contract(         ecommerceStoreArtifact.abi,         deployedNetwork.address       );       // get accounts       const accounts = await web3.eth.getAccounts();       this.account = accounts[0];     } catch (error) {       console.error("Could not connect to contract or chain.");     }   } }; window.App = {   start: function() {     var self = this;     //Bootstrap the Metacoin abstraction for use.     EcommerceStore.setProvider(web3.currentProvider);     renderStore();   } }; function renderStore() {   //get the product count   //loop through and fetch all products by id   var instance;   return EcommerceStore.deployed()     .then(function(f) {       instance = f;       return instance.productIndex.call();     })     .then(function(count) {       for (var i = 1; i <= count; i++) {         renderProduct(instance, i);       }     }); } function renderProduct(instance, index) {   instance.getProduct.call(index).then(function(f) {     let node = $("<div/>");     console.log(f);   }); } window.addEventListener("load", function() {   if (window.ethereum) {     // use MetaMask's provider     App.web3 = new Web3(window.ethereum);     window.ethereum.enable(); // get permission to access accounts   } else {     console.warn(       "No web3 detected. Falling back to http://127.0.0.1:9545. You should remove this fallback when you deploy live"     );     // fallback - use your fallback strategy (local node / hosted node + in-dapp id mgmt / fail)     App.web3 = new Web3(       new Web3.providers.HttpProvider("http://127.0.0.1:9545")     );   }   App.start(); }); index.js 너무 많이 바꼈네요.. ㅜ 이렇게 하면 앞에서 했던 iphoneX 크롬 개발자 도구로 ㅜ쿼리가 되던데 바뀐 index.js 코드에선 안되네요. 뭐가 잘못된 건가요?

index.js가 최신버젼이 너무 달라서 적응이 잘 안되네요 혹시 예제파일은 없나요??