Solidity-获取区块属性信息

前言：

合约发布工具及版本：mist v0.11.0

一：区块属性

1. blockhash(uint blockNumber)
   在0.4.22版本，将block.blockhash(uint blockNumber) returns (bytes32)替换

2. block.coinbase (address): 当前块所属旷工地址

3. block.difficulty (uint): 当前块难度
4. block.gaslimit (uint): 当前块汽油上限
5. block.number (uint): 当前块号
6. block.timestamp (uint): 当前块的时间戳，UNIX时代以来的秒
7. gasleft() returns (uint256): 剩余汽油
   在0.4.21版本，将msg.gas (uint)替换
8. msg.data (bytes): 提交的完整数据
9. msg.sender (address): 发送者
10. msg.sig (bytes4): calldata的前4个字节
11. msg.value (uint): 发送信息使用的wei数量
12. now (uint): 当前块的时间戳 (即 block.timestamp)
13. tx.gasprice (uint): 汽油的交易价格
14. tx.origin (address): 交易发送者

二：实例

pragma solidity ^0.4.20;
contract BlockDemo{
    bytes32 public _blockHash;
    address public _coinbase = block.coinbase;
    uint public _difficulty = block.difficulty;
    uint public _gasLimit = block.gaslimit;
    uint public _number = block.number;
    bytes public _data = msg.data;
    uint public _gas = gasleft();
    address public _sender = msg.sender;
    bytes4 public _gis = msg.sig;
    uint public _value  = msg.value;
    uint public _gasPrice = tx.gasprice;
    address public _orign = tx.origin;
    uint public _now = now;

    constructor() public {
        _blockHash = blockhash(block.number);
    }
}