学习 Solidity——智能合约开发Solidity 是一种受 C++、JavaScript 和 Python 影响的面向对象的编程语言。区分变量作用域：状态变量通常位于智能合约内部，但位于函数外部。局部变量位于函数内部，不能从该函数之外访问。全局变量不是由你声明的，当时它们“神奇地”可供你使用。// SPDX-License-Identifier: MIT pragma solidity ^0.8.20; import "@chainlink/contracts/src/v0.8/shared/interfaces/AggregatorV3Interface.sol"; contract PriceConsumerV3 { AggregatorV3Interface internal priceFeed; // priceFeed is a public variable of type AggregatorV3Interface constructor() { // _priceFeed is the address of the contract that implements the AggregatorV3Interface priceFeed = AggregatorV3Interface(0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e); // priceFeed is set to the address of the contract that implements the AggregatorV3Interface } function getLatestPrice() public view returns(int) { ( /*uint80 roundID*/, int price, // price is the price of the asset in the chainlink oracle /*uint startedAt*/, /*uint timeStamp*/, /*uint80 answeredInRound*/ ) = priceFeed.latestRoundData(); // Call the latestRoundData() function on the priceFeed contract return price; // Return the price of the asset in the chainlink oracle } }参考cid:link_0