以太坊切换网络以及调用合约方法
切换网络
window.ethereum &&
window.ethereum
.request({
method: 'wallet_addEthereumChain',
params: [
{
chainId: '0x38',
chainName: 'BSC',
nativeCurrency: {
name: 'BNB',
symbol: 'BNB',
decimals: 18,
},
rpcUrls: ['https://bsc-dataseed.binance.org/'],
blockExplorerUrls: ['https://bscscan.com/'],
},
],
})
.then(() => {
console.log('网络切换成功')
})
.catch((e) => {
})
网络说明，在BitKeep或者TokenPocket等钱包软件中访问DApp的话，可以直接在window.ethereum.chainId获取当前连接，且部分钱包不支持DApp切换网络，仅支持在钱包中切换
以太坊主网无法切换问题
我们一般通过wallet_addEthereumChain方法进行切换和添加网络，但此方法不能切换到主网以太坊Ethereum
在MetaMask钱包9.6.0之前，是不支持主网切换的
https://github.com/rekmarks/EIPs/blob/3326-create/EIPS/eip-3326.md
经过翻阅资料，可以使用 wallet_switchEthereumChain 切换，只需要传入一个chainId即可，此方法在MetaMask钱包9.6.0之后有效，目前9.6.0是最新的版本今天是[2021-06-19 09:55:06 星期六]
window.ethereum &&
window.ethereum
.request({
method: 'wallet_switchEthereumChain',
params: [
{
chainId: '0x1'
},
],
})
.then(() => {
console.log('网络切换成功')
})
.catch((e) => {
})
wallet_switchEthereumChain 可以切换到任意你已经添加到钱包的网络
wallet_addEthereumChain 可以添加网络，如网络已经存在，则为切换，但是无法切换到主网络
web3调用合约
这是我交易的一个地址
https://bscscan.com/address/0x948d2a81086a075b3130bac19e4c6dee1d2e3fe8#readProxyContract
调用方法
let myContract = new web3.eth.Contract(abi, address);
myContract.methods.[方法名](方法参数).call({
from: 发起人，
...其他参数
}).then(res=>{
console.log(res)
})
获取abi
得到abi.json
[
{
"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"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"internalType": "address",
"name": "previousGovernor",
"type": "address"
},
{
"indexed": true,
"internalType": "address",
"name": "newGovernor",
"type": "address"
}
],
"name": "GovernorshipTransferred",
"type": "event"
},
{
"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": "owner",
"type": "address"
},
{
"internalType": "address",
"name": "spender",
"type": "address"
}
],
"name": "allowance",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "spender",
"type": "address"
},
{
"internalType": "uint256",
"name": "amount",
"type": "uint256"
}
],
"name": "approve",
"outputs": [
{
"internalType": "bool",
"name": "",
"type": "bool"
}
],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "account",
"type": "address"
}
],
"name": "balanceOf",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "decimals",
"outputs": [
{
"internalType": "uint8",
"name": "",
"type": "uint8"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "spender",
"type": "address"
},
{
"internalType": "uint256",
"name": "subtractedValue",
"type": "uint256"
}
],
"name": "decreaseAllowance",
"outputs": [
{
"internalType": "bool",
"name": "",
"type": "bool"
}
],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "bytes32",
"name": "key",
"type": "bytes32"
},
{
"internalType": "address",
"name": "addr",
"type": "address"
}
],
"name": "getConfig",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "bytes32",
"name": "key",
"type": "bytes32"
}
],
"name": "getConfig",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "bytes32",
"name": "key",
"type": "bytes32"
},
{
"internalType": "uint256",
"name": "index",
"type": "uint256"
}
],
"name": "getConfig",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "governor",
"outputs": [
{
"internalType": "address",
"name": "",
"type": "address"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "spender",
"type": "address"
},
{
"internalType": "uint256",
"name": "addedValue",
"type": "uint256"
}
],
"name": "increaseAllowance",
"outputs": [
{
"internalType": "bool",
"name": "",
"type": "bool"
}
],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "governor_",
"type": "address"
},
{
"internalType": "address",
"name": "locked",
"type": "address"
},
{
"internalType": "address",
"name": "farm",
"type": "address"
},
{
"internalType": "address",
"name": "eco",
"type": "address"
},
{
"internalType": "address",
"name": "lp",
"type": "address"
}
],
"name": "initialize",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "governor_",
"type": "address"
}
],
"name": "initialize",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [],
"name": "name",
"outputs": [
{
"internalType": "string",
"name": "",
"type": "string"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "renounceGovernorship",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "bytes32",
"name": "key",
"type": "bytes32"
},
{
"internalType": "uint256",
"name": "value",
"type": "uint256"
}
],
"name": "setConfig",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "bytes32",
"name": "key",
"type": "bytes32"
},
{
"internalType": "address",
"name": "addr",
"type": "address"
},
{
"internalType": "uint256",
"name": "value",
"type": "uint256"
}
],
"name": "setConfig",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "bytes32",
"name": "key",
"type": "bytes32"
},
{
"internalType": "uint256",
"name": "index",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "value",
"type": "uint256"
}
],
"name": "setConfig",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [],
"name": "symbol",
"outputs": [
{
"internalType": "string",
"name": "",
"type": "string"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "totalSupply",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "recipient",
"type": "address"
},
{
"internalType": "uint256",
"name": "amount",
"type": "uint256"
}
],
"name": "transfer",
"outputs": [
{
"internalType": "bool",
"name": "",
"type": "bool"
}
],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "sender",
"type": "address"
},
{
"internalType": "address",
"name": "recipient",
"type": "address"
},
{
"internalType": "uint256",
"name": "amount",
"type": "uint256"
}
],
"name": "transferFrom",
"outputs": [
{
"internalType": "bool",
"name": "",
"type": "bool"
}
],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "newGovernor",
"type": "address"
}
],
"name": "transferGovernorship",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
}
]
获取address
得到
0x948d2a81086A075b3130BAc19e4c6DEe1D2E3fE8
调用的方法以及参数
调用方式
关于call和send
https://web3js.readthedocs.io/en/v1.3.4/web3-eth-contract.html#methods-mymethod-call
组合调用
import ABI from './abi.json'
let myContract = new web3.eth.Contract(ABI, '0x948d2a81086A075b3130BAc19e4c6DEe1D2E3fE8');
myContract.methods.balanceOf('0x23FCB0E1DDbC821Bd26D5429BA13B7D5c96C0DE0').call().then(res=>{
console.log(res)
})
调用结果：652202088575856719
我是在币安链上交易的，在调用之前必须切换到币安网络才能调用成功
调用结果与网站上调用结果一致表示调用成功
