Solidity的三种转账方式与比较

转账的3种方式

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address.transfer() address.send() address.call.value().gas()()

转账transfer

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function transfer(address _address) public payable{     _address.transfer(msg.value); }  function transfer2(address _address) public payable{     _address.transfer(10 * 10**18); }

转账send

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function transfer4(address _address) public payable {       _address.send(10 ether); }

转账call

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function transfer5(address _address) public payable returns(bool){    return  _address.call.value(10 ether)(); }

对比总结

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transfer与send相似，都为转账操作 transfer出错抛出异常 send、call出错不抛出异常，返回true或false tansfer相对send更安全 send、call即便转账失败也会执行其后的代码 慎用call函数转账，容易发生重入攻击。

address.transfer()

• throws on failure
• forwards 2,300 gas stipend (not adjustable), safe against reentrancy
• should be used in most cases as it's the safest way to send ether

address.send()

• returns false on failure
• forwards 2,300 gas stipend (not adjustable), safe against reentrancy
• should be used in rare cases when you want to handle failure in the contract

address.call.value().gas()()

• returns false on failure
• forwards all available gas (adjustable), not safe against reentrancy
• should be used when you need to control how much gas to forward when sending ether or to call a function of another contract