Or if you want to clone the github repository (wget need to be installed first) :
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git clone https://github.com/ethereum/remix-ide.git
git clone https://github.com/ethereum/remix.git # only if you plan to link remix and remix-ide repositories and develop on it.
cd remix-ide
npm install
npm run setupremix # only if you plan to link remix and remix-ide repositories and develop on it.
npm start
Then open your text editor and start developing. The browser will automatically refresh when files are saved.
Most of the the time working with other modules (like debugger etc.) hosted in the Remix repository is not needed.
Troubleshooting building
Some things to consider if you have trouble building the package:
Make sure that you have the correct version of node, npm and nvm. You can find the version that is tested on Travis CI by looking at the log in the build results.
Run:
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node --version
npm --version
nvm --version
In Debian based OS such as Ubuntu 14.04LTS you may need to run apt-get install build-essential. After installing build-essential run npm rebuild.
Unit Testing
Register new unit test files in test/index.js. The tests are written using tape.
Run the unit tests via: npm test
For local headless browser tests run npm run test-browser (requires Selenium to be installed – can be done with npm run selenium-install)
Running unit tests via npm test requires at least node v7.0.0
Browser Testing
To run the Selenium tests via Nightwatch serve the app through a local web server:
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npm run serve # starts web server at localhost:8080
Then you will need to either:
1.Have a Selenium server running locally on port 4444.
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Run: npm run test-browser
2.Or, install and run SauceConnect.
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Run: sc -u <USERNAME> -k <ACCESS_KEY> (see .travis.yml for values)
Run: npm run browser-test-sc
Usage as a Chrome Extension
If you would like to use this as a Chrome extension, you must either build it first or pull from the gh-pages branch, both described above. After that, follow these steps:
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1.Browse to chrome://extensions/
2.Make sure 'Developer mode' has been checked
3.Click 'Load unpacked extension...' to pop up a file-selection dialog
4.Select your remix-ide folder
Documentation
To see details about how to use Remix for developing and/or debugging Solidity contracts, please see our documentation page
https://remix.readthedocs.io/en/latest/
//指定使用solidity开发语言版本
pragma solidity ^0.4.19;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
//基本的算术方法库
//乘
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
assert(c / a == b);
return c;
}
//除
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
//减
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
//加
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
/**
* @title ERC20Basic
* @dev Simpler version of ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/179
*/
contract ERC20Basic {
//总供给量，也就是发币总量
uint256 public totalSupply;
//查询指定地址余额
function balanceOf(address who) public view returns (uint256);
//推荐的转账方法可以安全写入
function transfer(address to, uint256 value) public returns (bool);
//记录日志
//address indexed fromaddress indexed to, uint256 value:
event Transfer(address indexed from, address indexed to, uint256 value);
}
/**
* @title ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
contract ERC20 is ERC20Basic {
//, _owner _spender查询能够从地址 _owner 提出的代币数量
function allowance(address owner, address spender) public view returns (uint256);
// A-B从地址 _from 转移代币到地址 _to，必须触发 Transfer 事件
function transferFrom(address from, address to, uint256 value) public returns (bool);
// _spender _value成功调用 approve 时触发
function approve(address spender, uint256 value) public returns (bool);
//触发事件记录日志
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
* @title Basic token
* @dev Basic version of StandardToken, with no allowances.
*/
contract BasicToken is ERC20Basic {
//SafeMathLibrary,
using SafeMath for uint256;
//
mapping(address => uint256) balances;
//_valuetoken_to
/**
* @dev transfer token for a specified address
* @param _to The address to transfer to.
* @param _value The amount to be transferred.
*/
function transfer(address _to, uint256 _value) public returns (bool) {
//require
//address(0) 必须是有效地址
require(_to != address(0));
//balances:
//msg.sender
//发送者余额不为0
require(_value <= balances[msg.sender]);
// SafeMath.sub will throw if there is not enough balance.
//发送者余额扣减
balances[msg.sender] = balances[msg.sender].sub(_value);
//接受者余额增加
balances[_to] = balances[_to].add(_value);
//进行交易
Transfer(msg.sender, _to, _value);
return true;
}
//// balanceOffunctionbalanceOf(address _owner)constantreturns(uint256 balance)
/**
* @dev Gets the balance of the specified address.
* @param _owner The address to query the the balance of.
* @return An uint256 representing the amount owned by the passed address.
*/
function balanceOf(address _owner) public view returns (uint256 balance) {
return balances[_owner];
}
}
/**
* @title Standard ERC20 token
*
* @dev Implementation of the basic standard token.
* @dev https://github.com/ethereum/EIPs/issues/20
*/
contract StandardToken is ERC20, BasicToken {
mapping (address => mapping (address => uint256)) internal allowed;
/**
* @dev Transfer tokens from one address to another
* @param _from address The address which you want to send tokens from
* @param _to address The address which you want to transfer to
* @param _value uint256 the amount of tokens to be transferred
*/
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
require(_value <= balances[_from]);
require(_value <= allowed[_from][msg.sender]);
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(_value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
Transfer(_from, _to, _value);
return true;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
*
* Beware that changing an allowance with this method brings the risk that someone may use both the old
* and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
* race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
* @param _spender The address which will spend the funds.
* @param _value The amount of tokens to be spent.
*/
function approve(address _spender, uint256 _value) public returns (bool) {
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
/**
* @dev Function to check the amount of tokens that an owner allowed to a spender.
* @param _owner address The address which owns the funds.
* @param _spender address The address which will spend the funds.
* @return A uint256 specifying the amount of tokens still available for the spender.
*/
function allowance(address _owner, address _spender) public view returns (uint256) {
return allowed[_owner][_spender];
}
}
/// @title UFO Protocol Token.
/// For more information about this token, please visit http://www.banyanbbt.org
contract UFOToken is StandardToken {
string public name;
string public symbol;
uint public decimals;
/**
* CONSTRUCTOR
*
* @dev Initialize the UFO Token
*/
function UFOToken() public {
totalSupply = 10 * 10 ** 26;
balances[msg.sender] = totalSupply;
name = "UFOToken";
symbol = "UFO";
decimals = 18;
}
}
