037.Solidity入门——24发送代币_solidity发币

Solidity 有三种方法可以发送代币，分别是 transfer、send 和call。

示例代码：

pragma solidity ^0.8.7;
// 3 ways to send ETH
// transfer - 2300 gas, reverts
// send - 2300 gas, returns bool
// call -all gas, return bool and data
contract SendEther{    
    constructor() payable{}    
    receive() external payable {}    
    
    function sendViaTransfer(address payable _to, uint amount) external payable {
        //transfer方法        
        _to.transfer(amount);    
    }
        
    function sendViaSend(address payable _to, uint amount) external payable {
        //send 方法        
        bool sent = _to.send(amount);        
        require(sent, "send failed");    
    }
        
    function sendViaCall(address payable _to, uint amount) external payable {
        //call 方法        
        (bool success,) = _to.call{value: amount}("");        
        require(success, "call failed");    
    }
}
 
contract EthReceiver {//接收合约    
    event Log(uint amount, uint gas);
        
    receive() external payable {        
        emit Log(msg.value,gasleft());    
    }
}