【開發智能合約 — Solidity系列】實作篇Ep.4 -貨幣與時間單位

💰 乙太幣單位

// 1 wei是貨幣中的最小單位
uint oneWei = 1 wei;
        
require(oneWei == 1, "1 wei is not equal to 1");

// 1 gwei is equal to 10^9 wei
uint oneGWei = 1 gwei;
require(oneGWei == 1e9, "1 gwei is not equal to 1e9");
require(oneGWei == pow(10, 9));

// 1 ether is equal to 10^18 wei
uint oneEther = 1 ether;
require(oneEther == 1e18, "1 ether is not equal to 1e18");
require(oneEther == pow(10, 18));
require(oneEther == 1000000000 * oneGWei, "1 ether is not equal to 1000000000 gwei");

🕑 時間單位

// 1秒
assert(1 seconds == 1);

// 1分鐘 = 60秒
assert(1 minutes == 60 seconds);

// 1小時 = 60分鐘
assert(1 hours == 60 minutes);

// 1天=24小時
assert(1 days == 24 hours);

// 1周 = 7天
assert(1 weeks == 7 days);

function validate(uint start, uint secondsAfter) public {
		// 區塊的時間戳記至少在3秒以前, 才算有效
    if (block.timestamp >= start + secondsAfter * 3 seconds) {
      // ...
    }
}

結語