环境安装

nodejs安装

https://nodejs.org/

下载nodejs安装即可, node -v查看安装的版本，npm -v 查看npm版本。 建议对nodejs进行简单的环境配置, 同时下载并安装git， 并通过git –version查看git版本。

进行chain3库安装

npm install chain3 -g

注意：某些情况下，Windows下需要用“以管理员身份运行”进入cmd界面，才能使用npm
install 命令

API使用准备

var Chain3 = require('chain3');
var chain3 = new Chain3();
chain3.setProvider(new chain3.providers.HttpProvider('http://xxx.xxx.xxx.xxx:xxxx'));

API介绍

1. chain3.version.network：查看当前MOAC网络ID

var networkId = chain3.version.network;
console.log('network id:'+ networkId);

2. chain3.setProvider: 设置API访问MOAC节点方式

chain3.setProvider(new chain3.providers.HttpProvider('http://localhost:8545'));

3. chain3.sha3(string,options)

参数：string：传入的需要使用Keccak-256 SHA3算法进行哈希运算的字符串 options：可选项，如果要解析的是hex格式的十六进制字符串，需要设置为hex

var hash = chain3.sha3("the string to be hashed");
console.log(hash);
var hashOfHash = chain3.sha3(hash,{encoding:'hex'});
console.log(hashOfHash);

4. chain3.net.peerCount: 返回连接节点已连上的其他moac节点的数量

var peerCount = chain3.net.peerCount;
console.log(peerCount);

5. chain3.net.listening: 返回连接节点的listen状态

var listenState = chain3.net.listening;
console.log(listenState);

6. chain3.mc.coinbase: 节点配置的，如果挖矿成功奖励发送到该地址

var nodeCoinbase = chain3.mc.coinbase;
console.log(nodeCoinbase);

7. chain3.mc.mining: 节点的挖矿状态

var miningState = chain3.mc.mining;
console.log(miningState);  //true or false

8. chain3.mc.accounts: 节点持有的账户列表

var nodeAccounts = chain3.mc.accounts;
console.log(nodeAccounts);

9. chain3.mc.blockNumber: 当前区块号

var nowBlockNumber = chain3.mc.blockNumber;
console.log(nowBlockNumber);

10. chain3.mc.getBlockTransactionCount: 指定区块的交易数量

var transactionCount = chain3.mc.getBlockTransactionCount(96160);
console.log(transactionCount);

11. chain3.mc.getBalance: 给定地址的余额

var balance = chain3.mc.getBalance("0x36eaa71d7383be53cb600743aad08a55222a4915");
console.log("getBalance1" + balance); //instanceof BigNumber
console.log("getBalance2" + balance.toString(10));
//输出结果： getBalance1:3.04527226722e+21
//         getBalance2:3045272267220000000000

12. chain3.mc.defaultBlock: 默认块设置

var defultBlock = chain3.mc.defaultBlock;
console.log("defaultBlock" + defultBlock);
//默认值是latest，即最近刚出的区块
chain3.mc.defaultBlock = 123;  //传入一个值来覆盖默认配置
console.log("defaultBlock" + defultBlock);

13. chain3.mc.gasPrice: 当前gas价格

var gasPrice = chain3.mc.gasPrice;//该值由最近几个块的gas价格的中值决定
console.log(gasPrice.toString(10));

14. chain3.mc.estimateGas: 执行一个消息调用或交易，返回使用的gas量

var result = chain3.mc.estimateGas({
 to :"0xf7ebc6b854a202efe08e91422a44ba2161ed50dc",
 data: '0x23455654'
    //gas: 11,          //可选参数，设定gas
    //gasPrice: 11      //可选参数，设定gasPrice
});
console.log('estimateGas  :'+ result);
//输出结果：gasprice :20000000000
//        estimateGas :1273

15. chain3.mc.getCode: 获取指定地址的代码（地址合约编译后的字节代码）

var code  = chain3.mc.getCode("0x0000000000000000000000000000000000000065");//contract address

16. chain3.mc.syncing: 如果正在同步，返回同步对象；否则返回false

var sync = chain3.mc.syncing;
console.log('syncing  :'+ sync );
//如果正在同步，返回同步开始区块号、节点当前正在同步的区块号、预估要同步到的区块号

17. chain3.mc.getTransaction: 返回指定交易哈希值的交易

var blockHash = "0xbeca9c6a3a2f7bde119193e802f9506cc0ae58f23aca59f7ac8bf98e4e2242b5";
var transaction = chain3.mc.getTransaction(blockHash);
console.log('get transaction:'+ JSON.stringify(transaction));

18. chain3.mc.getBlock: 返回区块号或区块哈希值所对应的区块

var getTheBlock = chain3.mc.getBlock(96190);
console.log('get the block  :'+ JSON.stringify(getTheBlock ));

//TODO 稍后更新