imtoken錢包丨metamask小狐狸錢包丨tp錢包系統開發丨去中心化錢包系統開發詳細及原始碼

　　 區塊鏈可以執行程式碼。儘管最初的區塊鏈用於簡單的程式，主要是令牌事務，但是技術的進步使它能夠執行更復雜的事務並識別出開發良好的程式語言。

　　因為這些程式在區塊鏈上執行，所以它們的特性不同於其他軟體。

　　關於區塊鏈專案技術開發唯:MrsFu123，代幣發行、dapp智慧合約開發、鏈遊開發、單雙幣質押、多鏈錢包開發、NFT盲盒遊戲、公鏈、鏈上游戲開發

　　Uniswap博餅、交易所開發、量化合約開發、合約對沖、互助遊戲開發、Nft數字藏品開發、眾籌互助開發、元宇宙開發、swap開發、DAO智慧合約、

　　夾子合約、鏈上合約開發、ido開發、商城開發等，開發過各種各樣的系統模式，更有多種模式、制度、案例、後臺等，成熟技術團隊，歡迎實體參考。

　　首先，程式本身被記錄在塊鏈上，

　　因此具有區塊鏈非審計性；模式開發威：MrsFu123,其次，程式可以控制區塊鏈資產，例如可以儲存和傳輸加密貨幣；第三，程式由區塊鏈執行。

　　Blockchain is a new application model for computer technology such as distributed data storage,peer-to-peer transmission,consensus mechanism,and encryption algorithms.

　　Narrowly speaking,blockchain is a chain like data structure that combines data blocks in chronological order and ensures that they are tamper proof and unforgeable in a cryptologically secure distributed ledger.

　　Broadly speaking,blockchain technology is a new distributed infrastructure and computing method that utilizes blockchain data structures to validate and store data,distributed node consensus algorithms to generate and update data,cryptography to ensure data transmission and access security,and smart contracts composed of automated script code to program and operate data

　　什麼是DAPP？DAPP是Decentralized Application的縮寫，中文叫分散式應用/去中心化應用。通常來說，不同的DAPP會採用不同的底層技術開發平臺和共識機制，或者自行釋出代幣。

　　//returns sorted token addresses,used to handle return values from pairs sorted in this order

　　//兩個地址排序

　　function sortTokens(address tokenA,address tokenB)internal pure returns(address token0,address token1){

　　require(tokenA!=tokenB,'UniswapV2Library:IDENTICAL_ADDRESSES');

　　(token0,token1)=tokenA<tokenB?(tokenA,tokenB):(tokenB,tokenA);

　　require(token0!=address(0),'UniswapV2Library:ZERO_ADDRESS');

　　}

　　//calculates the CREATE2 address for a pair without making any external calls

　　//計算交易對地址，注意這個init code hash...這是個坑

　　function pairFor(address factory,address tokenA,address tokenB)internal pure returns(address pair){

　　(address token0,address token1)=sortTokens(tokenA,tokenB);

　　pair=address(uint(keccak256(abi.encodePacked(

　　hex'ff',

　　factory,

　　keccak256(abi.encodePacked(token0,token1)),

　　hex'de683b3097cb455dd2d3ea50f1f95386fdeca75180cc01bb6b12207c44272e17'//init code hash

　　))));

　　}

　　//fetches and sorts the reserves for a pair

　　//獲取當前儲備量，返回值會根據你輸入的token排序

　　function getReserves(address factory,address tokenA,address tokenB)internal view returns(uint reserveA,uint reserveB){

　　(address token0,)=sortTokens(tokenA,tokenB);

　　(uint reserve0,uint reserve1,)=IUniswapV2Pair(pairFor(factory,tokenA,tokenB)).getReserves();

　　(reserveA,reserveB)=tokenA==token0?(reserve0,reserve1):(reserve1,reserve0);

　　}

　　//given some amount of an asset and pair reserves,returns an equivalent amount of the other asset

　　//新增流動性時，透過tokenA輸入額，計算tokenB需要輸入多少

　　function quote(uint amountA,uint reserveA,uint reserveB)internal pure returns(uint amountB){

　　require(amountA>0,'UniswapV2Library:INSUFFICIENT_AMOUNT');

　　require(reserveA>0&&reserveB>0,'UniswapV2Library:INSUFFICIENT_LIQUIDITY');

　　amountB=amountA.mul(reserveB)/reserveA;

　　}

　　//given an input amount of an asset and pair reserves,returns the maximum output amount of the other asset

　　//透過in計算out(後面詳細說明)

　　function getAmountOut(uint amountIn,uint reserveIn,uint reserveOut)internal pure returns(uint amountOut){

　　require(amountIn>0,'UniswapV2Library:INSUFFICIENT_INPUT_AMOUNT');

　　require(reserveIn>0&&reserveOut>0,'UniswapV2Library:INSUFFICIENT_LIQUIDITY');

　　uint amountInWithFee=amountIn.mul(997);

　　uint numerator=amountInWithFee.mul(reserveOut);

　　uint denominator=reserveIn.mul(1000).add(amountInWithFee);

　　amountOut=numerator/denominator;

　　}

　　//given an output amount of an asset and pair reserves,returns a required input amount of the other asset

　　//透過out計算in(後面詳細說明)

　　function getAmountIn(uint amountOut,uint reserveIn,uint reserveOut)internal pure returns(uint amountIn){

　　require(amountOut>0,'UniswapV2Library:INSUFFICIENT_OUTPUT_AMOUNT');

　　require(reserveIn>0&&reserveOut>0,'UniswapV2Library:INSUFFICIENT_LIQUIDITY');

　　uint numerator=reserveIn.mul(amountOut).mul(1000);

　　uint denominator=reserveOut.sub(amountOut).mul(997);

　　amountIn=(numerator/denominator).add(1);

　　}