Web3js
web3.eth.contract 不工作
我使用 npm 安裝了 web3@0.20.2 。當我呼叫 web3.eth.contract() 時，它說它不是一個函式，而當我使用 new web3.eth.contract 時，它說它既不是建構子。這是我的程式碼
<!DOCTYPE html> <head> <script src="./node_modules/web3/dist/web3.min.js"> </script> </head> <body> <input name="choice" type="text"> Vote: </input> <button id="submit">Submit : </button> </body> <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script> <script> if (typeof web3 !== 'undefined') { web3 = new Web3(web3.currentProvider); } else { // set the provider you want from Web3.providers web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545")); } // Previous if/else statement removed for brevity web3.eth.defaultAccount = web3.eth.accounts[0]; var vote= web3.eth.contract([ { "constant": true, "inputs": [], "name": "c4", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "c2", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "c1", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "internalType": "uint256", "name": "x", "type": "uint256" } ], "name": "set", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "c0", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "get", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" }, { "internalType": "uint256", "name": "", "type": "uint256" }, { "internalType": "uint256", "name": "", "type": "uint256" }, { "internalType": "uint256", "name": "", "type": "uint256" }, { "internalType": "uint256", "name": "", "type": "uint256" }, { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "c5", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "c3", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" } ],'0x1def5958505131be74680211266cd0667b3fc75d'); console.log(vote); </script> </html>請問有人能找到錯誤嗎？
對於 web v0.20，創建對現有實例的引用應該分兩步完成
// Create contract object var MyContract = web3.eth.contract(abiArray); // Reference instance var contractInstance = MyContract.at(address);
我相信您實際上是在 web3 v1.x 上，在這種情況下，您確實應該使用
new web3.eth.Contract，但使用大寫的C.為了驗證您使用的是哪個版本的 web3，請
npm ls web3從命令行或console.log(web3.version)JS 程式碼執行。