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https://blog.csdn.net/peterwanghao/article/details/83181932

https://ethereum.stackexchange.com/questions/21448/how-to-get-a-contracts-balance-in-solidity function contractbalance() public view returns (uint256){ return address(this).balance; } var thecontract = web3.eth.contract([{"constant":false,"inputs":[{"name":"x","type":"uint256"}],"name":"set","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"get","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"gett","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"buy","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Set","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"tokens","type":"uint256"}],"name":"Buyvalue","type":"event"}]); var MyContract = thecontract.at('0xbed0229199614a11e47c39d4800420de968627fa'); MyContract.buy({ from:'0x5921a4C1B13afbD4b61d63e9c7BD47741C47B176', value:web3.toWei("1", "ether") }, console.log)

Just try to click website function or action. Like compile, then try again console web3.eth.accounts maybe no error Or var web3 = new Web3(new Web3.providers.HttpProvider(“http://myLocalHostIP:myRpcPort”));

https://remix.ethereum.org/ Method 1： No function name function () payable external { t = msg.value; emit Buyvalue(msg.value); } function () payable external { OR function () external payable { pragma solidity >=0.4.0 <0.6.0; contract SimpleStorage { uint storedData; uint256 t; event Set(address indexed _from, uint value); event Buyvalue(uint tokens); function set(uint x) public { storedData = x; emit Set(msg.sender, x); } function get() public view returns (uint) { return storedData; } function gett() public view returns (uint) { return t; } function () payable external { t = msg.value; emit Buyvalue(msg.value); } } MetaMask can not director send contract address eth, so use console ...

https://www.ethereum.org/token https://theethereum.wiki/w/index.php/ERC20_Token_Standard https://github.com/bokkypoobah/Tokens#fixed-supply-token