• address.transfer(uint256 value) ：给 address 转账 value(Wei)，且调用异常会抛出。

• address.call,  address.delegatecall：智能合约相互调用时使用，两者区别是，A调用B函数，call方法结果展示到B中，delegatecall方法结果展示到A中。

1、合约代码

pragma solidity ^0.4.0;
contract CA{
    uint public p;
    event e(address add,uint p);
    function fun(uint u1,uint u2)public{
        p = u1 + u2;
        emit e(msg.sender,p);
    }
}
contract CB{
    uint public q;
    bool public b;
    
    function CB() public payable {
        
    }
    
    function call1(address add)public returns(bool) {
        b = add.call(bytes4(keccak256("fun(uint256,uint256)")),2,3);
        return b;
    }
    
    function call2(address add)public returns(bool){
        b = add.delegatecall(bytes4(keccak256("fun(uint256,uint256)")),1,2);
        return b;
    }
    
    function sendDemo(address add) public{
        uint u = 1 ether;
        add.transfer(u);
    }
}

2、部署CA和CB合约，CB合约部署时存入100以太币

3、调用CB合约的send Dome方法，向主账户发送1个以太币

4、发送成功，CB合约以太币变为99