Question

8.11. 合约调用

		
address token = 0xdC7c2ab64Bc6861852C0Cd60B79564164eD890CF;
token.call(bytes4(sha3("fun(uint256)")), a);		
		
		

		
Function: transfer(address _to, uint256 _value)
MethodID: 0xa9059cbb		

token.call('0xa9059cbb', _to, _value);


pragma solidity ^0.4.24;

contract Test{
    address public token;
    
    constructor(address _contractAddress) public {
        token = _contractAddress; 
    }
    function transfer(address _to, uint256 _value) public returns (bool success){
        if(token.call(bytes4(keccak256("fun(address, uint256)")), _to, _value)){
            return false;
        }
        return true;
    }
}