address

address.transfer(value)

调用后，可以将异常返回到调用者手中

建议使用在转钱的过程

address.send(value)

只会返回布尔类型，不会有具体的报错信息

address.call, address.callcode, address.delegatecall

常用于智能合约和智能合约之间相互调用彼此函数的时候

0x0

While the zero address is only intended for contract registration, it sometimes receives payments from various addresses. There are two explanations for this:

• either it is by accident, resulting in the loss of ether
• or it is an intentional ether burn (see [burning_ether]).

If you want to do an intentional ether burn, you should make your intention clear to the network and use the specially designated burn address instead