转账的3种方式
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address.transfer()
address.send()
address.call.value().gas()()
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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);
}
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转账send
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function transfer4(address _address) public payable {
_address.send(10 ether);
}
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转账call
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function transfer5(address _address) public payable returns(bool){
return _address.call.value(10 ether)();
}
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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。
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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