区块链开发学习第五章:truffle-unbox使用
使用truffle模板能极大的提高我们学习区块链的进度以及了解智能合约
一、下载MetaCoin模板
truffle unbox metacoin
这里不知道是网络问题还是环境问题,搞了半天都没搞好,无论是K学上网还是设置hosts,都没用,最后只能通过git clone下载metacoin代码。
truffle官网地址:https://www.trufflesuite.com/boxes
git上下载truffle各模板地址:https://github.com/truffle-box
下载完之后同样需要修改truffle-config.js文件里面的私有链地址
二、truffle test
三、truffle compile
这里要开启挖矿
四、truffle console
五、控制台与合同进行交互
1、查看部署合约的账户metacoin余额
MetaCoin.deployed().then(function(instance){return instance.getBalance(web3.eth.accounts[0]);}).then(function(value){return value.toNumber()});
这里出了问题,提示是地址不合法,我查了合约代码应该是没问题来着,结果把web3.eth.accounts[0]换成我们私有链的第一个默认账户地址就可以了
MetaCoin.deployed().then(function(instance){return instance.getBalance('0x229ea411d368c97b008c7bc19b01fdd813163701');}).then(function(value){return value.toNumber()});
10000
为什么这里会有10000余额呢,我看了合约代码原来是这样的:
我们前面创建了两个账户,现在查一下第二个账户:
MetaCoin.deployed().then(function(instance){return instance.getBalance('0xbb723ee82cb41a733f2289588697f0e199e29de5');}).then(function(value){return value.toNumber()}); 0
合约里面getBalanceInEth方法写了一个metacoin值两个eth,所以调用下换算方法:
MetaCoin.deployed().then(function(instance){return instance.getBalanceInEth('0x229ea411d368c97b008c7bc19b01fdd813163701');}).then(function(value){return value.toNumber()}); 20000
调用sendCoin转账方法(开启挖矿):
MetaCoin.deployed().then(function(instance){return instance.sendCoin('0xbb723ee82cb41a733f2289588697f0e199e29de5', 500);}); { tx: '0x8716dab16ffb66b23604c476643105929cab24890914592f8eecd2ebb2f72020', receipt: { blockHash: '0xc94a716ba1463740bc85ceb7be6abaccd09d1c1f329642630a685a3b60785f7f', blockNumber: 546, contractAddress: null, cumulativeGasUsed: 51520, effectiveGasPrice: '0x3b9aca00', from: '0x229ea411d368c97b008c7bc19b01fdd813163701', gasUsed: 51520, logs: [ [Object] ], logsBloom: '0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000100000000000000000000004000010000000000000000000000000000000000000000000000000000000000000000000000100000000104000000000000000000000000000000000004000000020000000000000000002000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000100000', status: true, to: '0xaed8bef575a739c7239b4a140c789b2f41043279', transactionHash: '0x8716dab16ffb66b23604c476643105929cab24890914592f8eecd2ebb2f72020', transactionIndex: 0, type: '0x0', rawLogs: [ [Object] ] }, logs: [ { address: '0xAED8BEf575A739C7239B4a140c789B2f41043279', blockNumber: 546, transactionHash: '0x8716dab16ffb66b23604c476643105929cab24890914592f8eecd2ebb2f72020', transactionIndex: 0, blockHash: '0xc94a716ba1463740bc85ceb7be6abaccd09d1c1f329642630a685a3b60785f7f', logIndex: 0, removed: false, id: 'log_4626e8e8', event: 'Transfer', args: [Result] } ] }
转账完查看两个账户余额:
##账户一 MetaCoin.deployed().then(function(instance){return instance.getBalance('0x229ea411d368c97b008c7bc19b01fdd813163701');}).then(function(value){return value.toNumber()}); 9500 ##账户二 MetaCoin.deployed().then(function(instance){return instance.getBalance('0xbb723ee82cb41a733f2289588697f0e199e29de5');}).then(function(value){return value.toNumber()}); 500
如果有学习计划的童鞋,可以加我QQ一起交流: