eosjs简明使用手册(最新版)

以下教程用于EOS正式版,已在DEV开发链和EOS1.0.5-1.0.7版本的主链上测试通过。

官方文档 <https://github.com/EOSIO/eosjs/blob/master/README.md>因为版本的原因,内容多有错误,仅供参考。

eosjs的API与http-RPC调用一致,如rpc使用get-block,则在eosjs中使用getBlock()方法。即去横岗,首字符大写

eosjs几个容易出错的地方

* asset类型,表达方式为字符串,如:100.0000 EOS,千万注意小数点后四位,少一位都不行
* 与链连接时需要指定chainId,可以通过cleos get info获得
1- 安装eosjs

eosjs用于对交易签名、交易等操作。 eosjs-api用于读取链上数据,只读,如果只需要读取链上数据的话,只需要使用eosjs-api。

在nodejs中安装:
npm install eosjs npm install eosjs-api
注意nodejs需要最新版,如安装过程发生错误,请用node -v和npm -v查看版本。

2- 建立eosjs与链的连接
Eos = require('eosjs') // Optional configuration.. config = { keyProvider:
['PrivateKeys...'], // 配置私钥字符串 httpEndpoint: 'http://178.62.196.196:8888',
//DEV开发链url与端口 chainId:
"0b08e71a2f8caaccc2dc13244b788f5eba29462ecd5d5dea1ad8cbe9581e885a", // 通过cleos
get info可以获取chainId mockTransactions: () => null, // 如果要广播,需要设为null
transactionHeaders: (expireInSeconds, callback) => { callback(null/*error*/,
headers) //手动设置交易记录头,该方法中的callback回调函数每次交易都会被调用 }, expireInSeconds: 60,
broadcast: true, debug: false, sign: true, authorization: null //
该参数用于在多签名情况下,识别签名帐号与权限,格式如:account@permission } eos = Eos(config)
3- 建立eosjs-api与链的连接

如果加载了eosjs后,默认加载eosjs-api,无需单独链接eosjs-api与链
EosApi = require('eosjs-api') // everything is optional options = {
httpEndpoint: 'http://178.62.196.196:8888', verbose: false, // API logging
logger: { // Default logging functions //log: config.verbose ? console.log :
'', error: console.error }, fetchConfiguration: {} } eos = EosApi(options)
4- 获取帮助

不添加如何参数,可以获取该方法的使用说明,如:
eos.getBlock()
5- 获取链上最新出块信息
eos.getInfo({}).then(result => { console.log(result) })
返回:
{ server_version: 'b195012b', chain_id:
'0b08e71a2f8caaccc2dc13244b788f5eba29462ecd5d5dea1ad8cbe9581e885a',
head_block_num: 209307, last_irreversible_block_num: 209267,
last_irreversible_block_id:
'00033173a9ccd4bdd60a92d257e9354023b0457b134797be472a236cd908bc31',
head_block_id:
'0003319ba8ddc60d80c3cd0c7a70695cfd951f51ace9a798c913384cfbae659c',
head_block_time: '2018-07-15T01:51:07.500', head_block_producer:
'eoshackathon', virtual_block_cpu_limit: 100000000, virtual_block_net_limit:
1048576000, block_cpu_limit: 99900, block_net_limit: 1048576 }
如果需要拿到某一个数据值,比如:head_block_producer,则使用:
eos.getInfo({}).then(result => { console.log(result.head_block_producer)
//以对象属性方式获取head_block_producer })
6- 获取指定区块信息
eos.getBlock(200000).then(result => { console.log(result) }) //获取第200000个区块
或者:
eos.getBlock({block_num_or_id: 200000}).then(result => { console.log(result)
}) //获取第200000个区块
或者:

eos.getBlock('00030d4011a6744857533a6e6d907037a94c27a2dc006b4d28125f76bed2b355').then(result
=> { console.log(result) }) //根据id获取区块
或者:
eos.getBlock({block_num_or_id:
'00030d4011a6744857533a6e6d907037a94c27a2dc006b4d28125f76bed2b355'}).then(result
=> { console.log(result) }) //根据id获取区块
或者将返回值传到回调函数callback中处理:
callback = (err, res) => { err ? console.error(err) : console.log(res) }
eos.getBlock(200000, callback)
7- 获取账户余额
eos.getCurrencyBalance({ code: "eosio.token", account: "eosio", symbol: "DEV"
}).then(result => console.log(result))
以上命令相当于
cleos get currency balance eosio.token eosio DEV
8- 获取某代币的信息
eos.getCurrencyStats({code: "eosio.token", symbol: "DEV"}, callback)
//用上面出现的callback,下同
9- 获取账户信息
eos.getAccount({account_name: "eoshackathon"}, callback) //获取eoshackathon账户的信息
相当于:
cleos get account eoshackathon
返回:
{ account_name: 'eoshackathon', head_block_num: 219997, head_block_time:
'2018-07-15T03:20:12.500', privileged: false, last_code_update:
'1970-01-01T00:00:00.000', created: '2018-07-13T20:54:28.000', ram_quota: 8148,
net_weight: 500000, cpu_weight: 500000, net_limit: { used: 145, available:
120795486, max: 120795631 }, cpu_limit: { used: 1511, available: 11518458, max:
11519969 }, ram_usage: 3414, permissions: [ { perm_name: 'active', parent:
'owner', required_auth: [Object] }, { perm_name: 'owner', parent: '',
required_auth: [Object] } ], total_resources: { owner: 'eoshackathon',
net_weight: '50.0000 DEV', cpu_weight: '50.0000 DEV', ram_bytes: 8148 },
self_delegated_bandwidth: null, refund_request: null, voter_info: null }
10- 获取智能合约代码
eos.getCode({ account_name: "eosio"}, callback)
获取eosio账户的所有合约代码

11- 获取智能合约ABI
eos.getAbi({ account_name: "eosio"}, callback)
12- 获取Table行数据
eosjs.getTableRows({"scope":contract_name, "code":contract_name,
"table":"game", "json": true},callback)
13- 获取账户的Actions列表
eos.getActions({account_name: "eoshackathon", pos: 0, offset: 15}, callback)
//pos和offset是指:从第pos条记录开始获取offset条Actions
14- 获取公钥对应的账户
eos.getKeyAccounts({ public_key: 公钥字符串}, callback)
如果查找到帐号,则返回[],如果该公钥没有对应帐号,则报错。 相当于:
cleos get accounts 公钥
15- 获取主账号控制的其他帐号
eos.getControlledAccounts({ controlling_account: "eoshackathon"}, callback)
16- 获取transaction交易细节

该指令有bug,慎用!
eos.getTransaction({id: "xxxx"}, callback)
17- 转账交易

首先,在链接配置config中,keyProvider: [发送方私钥] 其次,可以设置options参数如下:
options = { authorization: '发送方帐号@active', broadcast: true, sign: true }
方式1:
eos.transfer('发送方帐号', '接收方帐号', '0.3000 DEV','memo')
如果需要对返回值处理:
eos.transfer('发送方帐号', '接收方帐号', '0.3000 DEV','memo', callback)
如果有options参数,则:
eos.transfer('发送方帐号', '接收方帐号', '0.3000 DEV','memo', options, callback)
方式2:

使用对象:
eos.transfer({ from: '发送方帐号', to: '接收方帐号', quantity: '0.1000 DEV', memo: '备注',
callback })
如果不想广播交易,可以使用以下简便指令:
eos.transfer('发送方帐号', '接收方帐号', '0.3000 DEV','memo', false) //在最后加上false,不广播
方式3:

使用eos.transaction,构造对象执行
eos.transaction( { // ...headers, actions: [ { account: 'eosio.token', name:
'transfer', authorization: [{ actor: '发送方帐号', permission: 'active' }], data: {
from: '发送方帐号', to: '接收方帐号', quantity: '0.3000 DEV', memo: '备注' } } ] } //
options -- example: {broadcast: false} )
以上命令与以下cleos相同:
cleos push action eosio.token transfer '[ "发送方帐号", "接收方帐号", "0.3000 DEV", "备注"
]' -p 发送方帐号
18- 新建帐号
creatoraccount = "testtesttest" //主账号 newaccount = "testtest1113" //新账号
newaccount_pubkey = "EOS5LUYdLZAd3uHF5XGAeE61aTeSXWqvqxBSUq3uhqYH7kY15Drjf"
//新账号的公钥 //构建transaction对象 eos.transaction(tr => { //新建账号 tr.newaccount({
creator: creatoraccount, name: newaccount, owner: newaccount_pubkey, active:
newaccount_pubkey }) //为新账号充值RAM tr.buyrambytes({ payer: creatoraccount,
receiver: newaccount, bytes: 8192 }) //为新账号抵押CPU和NET资源 tr.delegatebw({ from:
creatoraccount, receiver: newaccount, stake_net_quantity: '1.0000 DEV',
stake_cpu_quantity: '1.0000 DEV', transfer: 0 }) })
19- 购买RAM
creatoraccount = "testtesttest" //主账号 newaccount = "testtest1113" //新账号
eos.transaction(tr => { tr.buyrambytes({ payer: creatoraccount, receiver:
newaccount, bytes: 8192 })
或者
eos.transaction(tr => { tr.buyram({ payer: creatoraccount, receiver:
newaccount, quant: 8 //以k为单位的内存,8k=8192字节 })
20- 出售RAM
eos.transaction(tr => { tr.sellram({ account: 'testtesttest', bytes: 1024
//出售1k内存 }) })
21- 竞拍账号名
eos.transaction(tr => { tr.bidname ({ bidder: "testtesttest", newname:
"竞拍的名字", bid: 价格 }) })
22- 抵押CPU和NET
eos.transaction(tr => { tr.delegatebw({ from: "testtesttest", receiver:
"testtesttest", //testtesttest账户为自己抵押 stake_net_quantity: "1.0000 DEV",
stake_cpu_quantity: "1.0000 DEV", transfer: 0 }) })
23- 取消抵押(赎回)CPU和NET
eos.transaction(tr => { tr.undelegatebw({ from: "testtesttest", receiver:
"testtesttest", unstake_net_quantity: "0.1000 DEV", //赎回0.1个DEV
unstake_cpu_quantity: "0.1000 DEV" }) })
24- 智能合约部署

如果是加载wasm合约,不用使用binaryen,如果加载wast合约,需要安装并使用binaryen,如下:
npm install [email protected]
并用以下方式导入到js
binaryen = require('binaryen') eos = Eos({keyProvider, binaryen})
部署合约

以官方自带的hello合约为例
fs = require('fs') wasm = fs.readFileSync(`contracts/hello/hello.wasm`)
//这个文件在客户端上,而不是在服务器上 abi = fs.readFileSync(`contracts/hello/hello.abi`)
eos.setcode('contract_name', 0, 0, wasm) // contract_name 为合约名
eos.setabi('contract_name', JSON.parse(abi)) // @returns {Promise}
25- 智能合约的执行

方法一:
eos.contract("contract_name").then(hello => { //hello随便起的变量名 hello.hi('axay',
{ //hi是方法名, 'axay'是该hello合约hi方法的参数 authorization: ['testtesttest']
//testtesttest是建立该合约的用户 }).then(result => { console.log(result); }); });
方法二:
eos.transaction( { actions: [ { account: 'contract_name', //合约名 name: 'hi',
//方法名,该方法在官方的hello合约中有 authorization: [{ actor: 'testtesttest', permission:
'active' }], data: { user: 'axay' } } ] } // options -- example: {broadcast:
false} ).then(result => console.log(result))
26- 通过eosjs发行一个代币

发行代币有两种方式,一种是通过cleos,参考这里
<https://github.com/qq776355102/eos_dapp_development_cn/blob/master/docs/token_exchange_msig.md>
,但前提是必须要安装好EOS系统。 另一种方式是通过eosjs,无需在本机安装EOS系统。

注意:

此操作需要以eosio.token账户进行操作,因此需将eosio.token帐号的私钥导入到keyProvider数组中。但如果出于安全原因,不允许将
eosio.token账户私钥加到程序中的话,则可以由发币的用户先部署eosio.token合约,然后再做接下去的操作。

第一步:创建代币
eos.transaction( { // ...headers, actions: [ { account: 'eosio.token', //合约名
name: 'create', //调用创建代币的方法 authorization: [{ actor: 'eosio.token',
//必须是eosio.token permission: 'active' }], data: { issuer: 'testtesttest',
//代币发行方 maximum_supply: '10000.0000 AAA', //代币总量与名称 can_freeze: 0, can_recall:
0, can_whitelist: 0 } } ] } // options -- example: {broadcast: false}
).then(result => console.log(result))
第二步:发行代币
eos.transaction( { // ...headers, actions: [ { account: 'eosio.token', //合约名
name: 'issue', //调用发行代币的方法 authorization: [{ actor: 'testtesttest', //必须是代币的发行方
permission: 'active' }], data: { to: 'testtesttest', //收到代币的帐号 quantity:
'1000.0000 AAA', memo: "testtesttest issue 1000 AAA" } } ] } // options --
example: {broadcast: false} ).then(result => console.log(result))
也可以将以上两步合在一起操作,如:
eos.transaction( { // ...headers, actions: [ { account: 'eosio.token', //合约
name: 'create', //方法 authorization: [{ actor: 'eosio.token', permission:
'active' }], data: { issuer: 'testtesttest', maximum_supply: '10000000.0000
GAT', can_freeze: 0, can_recall: 0, can_whitelist: 0 } }, { account:
'eosio.token', //合约 name: 'issue', //方法 authorization: [{ actor:
'testtesttest', permission: 'active' }], data: { to: 'testtest1111', quantity:
'1000.0000 GAT', memo: "testtesttest issue 1000 GAT to testtest1111" } } ] } //
options -- example: {broadcast: false} ).then(result => console.log(result))
 27- 获取合约abi和wasm文件
eos.getRawCodeAndAbi(contract_name)
 

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