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update NFTSwap
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38_NFTSwap/readme.md

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@@ -43,7 +43,7 @@ event Update(address indexed seller, address indexed nftAddr, uint256 indexed to
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### 订单
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`NFT`订单抽象为`Order`结构体,包含挂单价格`price`和持有人`owner`信息。`nftList`映射记录了订单是对应的`NFT`系列(合约地址)和`tokenId`信息。
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`NFT`订单抽象为`Order`结构体,包含挂单价格`price`和持有人`owner`信息。`nftList`映射通过`NFT`合约地址和`tokenId`信息,能定位到具体NFT的订单(包括持有者地址和挂单价格)
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```solidity
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// 定义order结构体

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