开发DApp需要具备区块技术的基本知识，例如如何创建区块、如何验证交易、如何构建智能合约等。
智能合约语言：智能合约是DApp的核心开发181流程**2591技术3365案例需要使用智能合约语言编写。目前比较流行的智能合约语言包括Solidity、Vyper、Rust、C++等。
智能合约（英语：Smart contract ）是一种旨在以信息化方式传播、验证或执行合同的计算机协议。智能合约允许在没有第三方的情况下进行可信交易，这些交易可追踪且不可逆转。
UserStruct memory userStruct;
currUserID++;
userStruct = UserStruct({
isExist: true,
id: currUserID,
referrerID: 0,
referral: new address[](0)
});
users[ownerWallet] = userStruct;
userList[currUserID] = ownerWallet;
for(uint i = 1; i <= 10; i++) {
users[ownerWallet].levelExpired[i] = ;
}
}
function () external payable {
uint level;
if(msg.value == LEVEL_PRICE[1]) level = 1;
else if(msg.value == LEVEL_PRICE[2]) level = 2;
else if(msg.value == LEVEL_PRICE[3]) level = 3;
else if(msg.value == LEVEL_PRICE[4]) level = 4;
else if(msg.value == LEVEL_PRICE[5]) level = 5;
else if(msg.value == LEVEL_PRICE[6]) level = 6;
else if(msg.value == LEVEL_PRICE[7]) level = 7;
else if(msg.value == LEVEL_PRICE[8]) level = 8;
else if(msg.value == LEVEL_PRICE[9]) level = 9;
else if(msg.value == LEVEL_PRICE[10]) level = 10;
else revert('Incorrect Value send');
if(users[msg.sender].isExist) buyLevel(level);
else if(level == 1) {
uint refId = 0;
address referrer = bytesToAddress(msg.data);
if(users[referrer].isExist) refId = users[referrer].id;
else revert('Incorrect referrer');