质押模式（Staking）通常在区块链项目中用于提高网络安全性，奖励参与共识机制的用户。以下是一个简单的以太坊智能合约（Solidity）代码示例，用于实现一个简单的质押系统。这个示例包括质押、解锁和领取奖励等功能。

```solidity

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

contract Staking {

using SafeMath for uint256;

// 定义事件

event Staked(address indexed user, uint256 amount);

event Unstaked(address indexed user, uint256 amount);

event RewardClaimed(address indexed user, uint256 reward);

// 定义质押代币

enum Token { ETH, ERC20 }

// 定义质押代币合约地址

address public constant ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

address public constant ERC20_ADDRESS = 0x***;

// 定义质押代币名称

string public constant ETH_NAME = "Ether";

string public constant ERC20_NAME = "Custom ERC20 Token";

// 定义质押代币符号

string public constant ETH_SYMBOL = "ETH";

string public constant ERC20_SYMBOL = "CET";

// 定义质押代币精度

uint8 public constant ETH_DECIMALS = 18;

uint8 public constant ERC20_DECIMALS = 18;

// 定义质押奖励

mapping(Token => uint256) public rewards;

// 定义质押余额

mapping(address => mapping(Token => uint256)) public balances;

// 定义质押总数

mapping(Token => uint256) public totalStaked;

// 定义用户质押起始时间

mapping(address => mapping

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