javascript 如何连接ethers.js和metamask？

xvw2m8pv  于 2023-03-28  发布在  Java
关注(0)|答案(3)|浏览(143)

我正在使用ethers.js文档：https://docs.ethers.io/ethers.js/html/cookbook-providers.html.我在设置提供程序时遇到错误-：未捕获引用错误：web 3未定义，我想将我的去中心化应用程序与元掩码连接。为此，我试图通过根据文档设置提供程序来将元掩码与ethers.js连接。我使用了provider = new ethers.providers.Web3Provider（web3.currentProvider）。但它在代码中抛出了web 3对象的错误。此代码与文档完全相同。但仍然无法工作。

//let provider = new ethers.getDefaultProvider('rinkeby');
        let provider = new ethers.providers.Web3Provider(web3.currentProvider);
        let contract;
        let wallet;
        let abi = [
    {
        "anonymous": false,
        "inputs": [
            {
                "indexed": true,
                "internalType": "address",
                "name": "account",
                "type": "address"
            },
            {
                "indexed": false,
                "internalType": "string",
                "name": "pwd",
                "type": "string"
            }
        ],
        "name": "Pwd_Assigned",
        "type": "event"
    },
    {
        "inputs": [
            {
                "internalType": "string",
                "name": "_passwd",
                "type": "string"
            }
        ],
        "name": "setPwd",
        "outputs": [
            {
                "internalType": "bool",
                "name": "success",
                "type": "bool"
            }
        ],
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "string",
                "name": "_uname",
                "type": "string"
            }
        ],
        "name": "setUname",
        "outputs": [
            {
                "internalType": "bool",
                "name": "success",
                "type": "bool"
            }
        ],
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "string",
                "name": "_uType",
                "type": "string"
            }
        ],
        "name": "setUtype",
        "outputs": [
            {
                "internalType": "bool",
                "name": "success",
                "type": "bool"
            }
        ],
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "anonymous": false,
        "inputs": [
            {
                "indexed": true,
                "internalType": "address",
                "name": "account",
                "type": "address"
            },
            {
                "indexed": false,
                "internalType": "string",
                "name": "utype",
                "type": "string"
            }
        ],
        "name": "Type_Assigned",
        "type": "event"
    },
    {
        "anonymous": false,
        "inputs": [
            {
                "indexed": true,
                "internalType": "address",
                "name": "account",
                "type": "address"
            },
            {
                "indexed": false,
                "internalType": "string",
                "name": "uname",
                "type": "string"
            }
        ],
        "name": "Username_Assigned",
        "type": "event"
    },
    {
        "inputs": [],
        "name": "getContractName",
        "outputs": [
            {
                "internalType": "string",
                "name": "_name",
                "type": "string"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [],
        "name": "name",
        "outputs": [
            {
                "internalType": "string",
                "name": "",
                "type": "string"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "address",
                "name": "",
                "type": "address"
            }
        ],
        "name": "pwd",
        "outputs": [
            {
                "internalType": "string",
                "name": "",
                "type": "string"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [],
        "name": "symbol",
        "outputs": [
            {
                "internalType": "string",
                "name": "",
                "type": "string"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "address",
                "name": "",
                "type": "address"
            }
        ],
        "name": "uname",
        "outputs": [
            {
                "internalType": "string",
                "name": "",
                "type": "string"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "address",
                "name": "",
                "type": "address"
            }
        ],
        "name": "uType",
        "outputs": [
            {
                "internalType": "string",
                "name": "",
                "type": "string"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    }
];
        let contractAddress = "0xECFFa8439Fa4DC64388227fA43a420449E895c3f"; // for rinkeby
        let AidTokenAbi = [
            {
                "inputs": [
                    {
                        "internalType": "uint256",
                        "name": "_initialSupply",
                        "type": "uint256"
                    }
                ],
                "stateMutability": "nonpayable",
                "type": "constructor"
            },
            {
                "anonymous": false,
                "inputs": [
                    {
                        "indexed": true,
                        "internalType": "address",
                        "name": "_owner",
                        "type": "address"
                    },
                    {
                        "indexed": true,
                        "internalType": "address",
                        "name": "_spender",
                        "type": "address"
                    },
                    {
                        "indexed": false,
                        "internalType": "uint256",
                        "name": "_value",
                        "type": "uint256"
                    }
                ],
                "name": "Approval",
                "type": "event"
            },
            {
                "inputs": [
                    {
                        "internalType": "address",
                        "name": "_spender",
                        "type": "address"
                    },
                    {
                        "internalType": "uint256",
                        "name": "_value",
                        "type": "uint256"
                    }
                ],
                "name": "approve",
                "outputs": [
                    {
                        "internalType": "bool",
                        "name": "success",
                        "type": "bool"
                    }
                ],
                "stateMutability": "payable",
                "type": "function"
            },
            {
                "inputs": [
                    {
                        "internalType": "address",
                        "name": "_to",
                        "type": "address"
                    },
                    {
                        "internalType": "uint256",
                        "name": "_value",
                        "type": "uint256"
                    }
                ],
                "name": "transfer",
                "outputs": [
                    {
                        "internalType": "bool",
                        "name": "success",
                        "type": "bool"
                    }
                ],
                "stateMutability": "payable",
                "type": "function"
            },
            {
                "anonymous": false,
                "inputs": [
                    {
                        "indexed": true,
                        "internalType": "address",
                        "name": "_from",
                        "type": "address"
                    },
                    {
                        "indexed": true,
                        "internalType": "address",
                        "name": "_to",
                        "type": "address"
                    },
                    {
                        "indexed": false,
                        "internalType": "uint256",
                        "name": "_value",
                        "type": "uint256"
                    }
                ],
                "name": "Transfer",
                "type": "event"
            },
            {
                "inputs": [
                    {
                        "internalType": "address",
                        "name": "_from",
                        "type": "address"
                    },
                    {
                        "internalType": "address",
                        "name": "_to",
                        "type": "address"
                    },
                    {
                        "internalType": "uint256",
                        "name": "_value",
                        "type": "uint256"
                    }
                ],
                "name": "transferFrom",
                "outputs": [
                    {
                        "internalType": "bool",
                        "name": "success",
                        "type": "bool"
                    }
                ],
                "stateMutability": "payable",
                "type": "function"
            },
            {
                "inputs": [
                    {
                        "internalType": "address",
                        "name": "",
                        "type": "address"
                    },
                    {
                        "internalType": "address",
                        "name": "",
                        "type": "address"
                    }
                ],
                "name": "allowance",
                "outputs": [
                    {
                        "internalType": "uint256",
                        "name": "",
                        "type": "uint256"
                    }
                ],
                "stateMutability": "view",
                "type": "function"
            },
            {
                "inputs": [
                    {
                        "internalType": "address",
                        "name": "",
                        "type": "address"
                    }
                ],
                "name": "balanceOf",
                "outputs": [
                    {
                        "internalType": "uint256",
                        "name": "",
                        "type": "uint256"
                    }
                ],
                "stateMutability": "view",
                "type": "function"
            },
            {
                "inputs": [],
                "name": "name",
                "outputs": [
                    {
                        "internalType": "string",
                        "name": "",
                        "type": "string"
                    }
                ],
                "stateMutability": "view",
                "type": "function"
            },
            {
                "inputs": [],
                "name": "standard",
                "outputs": [
                    {
                        "internalType": "string",
                        "name": "",
                        "type": "string"
                    }
                ],
                "stateMutability": "view",
                "type": "function"
            },
            {
                "inputs": [],
                "name": "symbol",
                "outputs": [
                    {
                        "internalType": "string",
                        "name": "",
                        "type": "string"
                    }
                ],
                "stateMutability": "view",
                "type": "function"
            },
            {
                "inputs": [],
                "name": "tokensSold",
                "outputs": [
                    {
                        "internalType": "uint256",
                        "name": "",
                        "type": "uint256"
                    }
                ],
                "stateMutability": "view",
                "type": "function"
            },
            {
                "inputs": [],
                "name": "totalSupply",
                "outputs": [
                    {
                        "internalType": "uint256",
                        "name": "",
                        "type": "uint256"
                    }
                ],
                "stateMutability": "view",
                "type": "function"
            }
        ];
        let AidtokenAddress = "0x17b0e97DF8217a984294De6bDbbb9D7020190479";
        let AidTokenContract;
        let signer = provider.getSigner();
        let usr_account;

        function loadWallet(){
            signer.getAddress().then(async(res)=>{
                usr_account = res;
                await console.log(usr_account);
            });
        }

        // async function setProvider(){
        //   provider = await new ethers.providers.JsonRpcProvider('http://127.0.0.1:8545');
        // }

        function getContract(){
            contract = new ethers.Contract(contractAddress,abi, signer);
            console.log(contract.functions);
        }
        
        function getTokenContract(){
            AidTokenContract = new ethers.Contract(AidtokenAddress,AidTokenAbi, signer);
        }
        
        async function getName(){
            // var name = await contract.functions.getContractName();
            // console.log(name);
            await contract.name().then(async (res)=>{
              await console.log(res);
            });
        }

        async function setInfo(event){
            event.preventDefault();
            loadWallet();
            getContract();
            var uname = document.getElementById('uname').value;
            var pwd = document.getElementById('psw').value;
            var utype = document.getElementById('utype').value;
            await contract.functions.setUname(uname).then(async(res)=>{
                console.log(res);
            });
            await contract.functions.setUtype(utype).then(async(res)=>{
                console.log(res);
            });
            await contract.functions.setPwd(pwd).then(async(res)=>{
                console.log(res);
            });
            //getInfo();
        }

        async function getInfo(event){
          event.preventDefault();
            var uname;
            var utype;
            var pwd;
            loadWallet();
            getContract();
            await contract.functions.uname(usr_account).then(async(res)=>{
                uname=res;
                console.log(res);
            });
            await contract.functions.uType(usr_account).then(async(res)=>{
                utype = res;
                console.log(res);
            });
            await contract.functions.pwd(usr_account).then(async(res)=>{
                pwd=res
                console.log(res);
            });
        }

        async function transfer(event){
            event.preventDefault();
            loadWallet();
            getTokenContract();
            await console.log(".....");
            var numberOfTokens = document.getElementById('numberOfTokens').value;
            await AidTokenContract.functions.transfer(numberOfTokens,{
                from: usr_account,
                gasLimit: 500000
            });
        }

        //setProvider();
        loadWallet();
        getContract();
        //getName();

        // setInfo();
        //getInfo();
<html>
  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/qrcode-generator/1.4.3/qrcode.min.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js"></script>
    <!-- <script src="js/web3.min.js"></script> -->
    <script charset="utf-8"
            src="https://cdn.ethers.io/scripts/ethers-v4.min.js" type="text/javascript">
        </script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.js"></script>
  </head>
  <body>

    <form onsubmit="setInfo(event)">
        <div>
                  <h1>Register</h1>
                  <p>Please fill in this form to create an account.</p>
                  <hr>
                <br>
                  <label for="uname"><b>User Name</b></label>
                  <input type="text" placeholder="Enter Username" id="uname" required>
                <br>
                  <label for="utype">Choose a User type:</label>
                  <select id="utype" name="utype">
                        <option value="Donor">Donor</option>
                        <option value="NGO">NGO</option>
                        <option value="Government">Government</option>
                  </select>
              <br>
                  <label for="psw"><b>Password</b></label>
                  <input type="password" placeholder="Enter Password" id="psw" required>
              
                  <!-- <label for="psw-repeat"><b>Repeat Password</b></label>
                  <input type="password" placeholder="Repeat Password" name="psw-repeat" required>
                  <hr> -->
              
                  <p>By creating an account you agree to our <a href="#">Terms & Privacy</a>.</p>
                  <button type="submit" id="registerbtn">Register</button>
        </div>
              
                <div class="container signin">
                  <p>Already have an account? <a href="#">Sign in</a>.</p>
                </div>
    </form>
<br><br>
    <form onsubmit="getInfo(event)">
        <button type="submit" >Get Info</button>
    </form>

    <form onsubmit="transfer(event)">
      <input id="numberOfTokens" type="number" name="number" value="1" min="1" pattern="[0-9]">
      <button type="submit" >Donate</button>
  </form>
  <!-- <script src="https://cdn.jsdelivr.net/gh/ethereum/web3.js/dist/web3.min.js"></script> -->
  
    
    <script src="js/app.js"></script>

  </body>
</html>

JavaScript

3条答案

按热度按时间
aemubtdh

aemubtdh1#

使用ethers.js与Metamask交互

v6.0.0（2023-02-02）及以上版本

const provider = new ethers.BrowserProvider(window.ethereum);
// Prompt user for account connections
await provider.send("eth_requestAccounts", []);
const signer = provider.getSigner();
console.log("Account:", await signer.getAddress());

v5.7.2及以下版本

const provider = new ethers.providers.Web3Provider(window.ethereum, "any");
// Prompt user for account connections
await provider.send("eth_requestAccounts", []);
const signer = provider.getSigner();
console.log("Account:", await signer.getAddress());
赞(0）分享  回复(0）举报  2023-03-28
c7rzv4ha

c7rzv4ha2#

我也觉得这很困惑。根据Metamask的ethers.js文档，需要以下内容：

const provider = new ethers.providers.Web3Provider(web3.currentProvider);
const signer = provider.getSigner();

但这会导致错误：特别是web3.currentProvider没有被识别。
Ethers.js github issue log在Issue #433中也有类似的抱怨。因此，我使用了window.ethereum来代替web3.currentProvider，并预先包含了.enable()：

await window.ethereum.enable()
const provider = new ethers.providers.Web3Provider(window.ethereum);
const signer = provider.getSigner();

或者（在异步函数之外）：

let provider;
window.ethereum.enable().then(provider = new ethers.providers.Web3Provider(window.ethereum));
const signer = provider.getSigner();

这将清 debugging 误，并确保Metamask在连接到浏览器/DApp之前请求权限。

赞(0）分享  回复(0）举报  2023-03-28
lrpiutwd

lrpiutwd3#

不建议使用window.ethereum.enable()。
您应该用途：

ethereum.request({ method: 'eth_requestAccounts' })
赞(0）分享  回复(0）举报  2023-03-28
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