The blockchain mall system is mainly based on blockchain technology to create an e-commerce ecosystem and build a decentralized business ecosystem. By connecting the value of digital assets and real business, we will perfectly combine powerful offline experiential services with efficient blockchain internet finance, provide more efficient and valuable intelligent services for users and merchants, and realize the blockchain transformation of commercial services. Blockchain is a distributed database (system) placed in a non-secure environment. It uses cryptographic methods to ensure that existing data cannot be tampered with. At the same time, blockchain uses consensus algorithms to reach consensus on new data. Based on the above characteristics, the current situation of data transaction can be completely changed in data transaction, and a variety of solutions and design ideas have been produced. The following is mainly explained from the perspective of blockchain technology in solving data ownership on the big data transaction platform. 　　合約初始化 　　公共函數(shù)（合約內(nèi)外部都可以調(diào)用） 　　constructor 　　代碼速覽 　　constructor()public{ 　　factory=msg.sender; 　　}商城系統(tǒng)：I35 system 7O98 development o7I8 　　參數(shù)分析 　　函數(shù)constructor的入?yún)⒂?個(gè)，出參有0個(gè)。 　　在合約初始化時(shí)，Pair合約會(huì)將msg.sender記錄為factory地址。 　　實(shí)現(xiàn)分析 　　... 　　{ 　　//設(shè)置factory地址 　　factory=msg.sender; 　　} 　　總結(jié) 　　Pair合約初始化時(shí)，會(huì)記錄factory地址。 　　外部函數(shù)（僅合約外部可以調(diào)用） 　　initialize 　　代碼速覽 　　function initialize(address _token0,address _token1)external{開發(fā)流程：mrsfu123 　　require(msg.sender==factory,'UniswapV2:FORBIDDEN'); 　　token0=_token0; 　　token1=_token1; 　　} 　　參數(shù)分析 　　函數(shù)initialize的入?yún)⒂?個(gè)，出參有0個(gè)，對(duì)應(yīng)的解釋如下： 　　function initialize( 　　address _token0,//token0地址 　　address _token1//token1地址 　　)external{ 　　... 　　} 　　由于create2函數(shù)無法傳參，因此需要再次調(diào)用initialize函數(shù)來記錄token0和token1的地址。 　　實(shí)現(xiàn)分析 　　... 　　{ 　　//檢查msg.sender地址等于factory地址 　　require(msg.sender==factory,'UniswapV2:FORBIDDEN'); 　　//記錄token0和token1地址 　　token0=_token0; 　　token1=_token1; 　　} 　　總結(jié) 　　由于initialize是初始化函數(shù)，因此只能由factory調(diào)用，且只會(huì)調(diào)用一次。