网上搜索的资料写的很详细啊，可试验啊试验，始终不成功，

使用Web3.js查询以太币和代币余额以及转账

https://www.jianshu.com/p/496c9d833df9

不用自己同步以太坊节点，直接发起签名交易

https://segmentfault.com/a/1190000014729677

以太坊ERC20 Token标准完整说明

https://blog.csdn.net/diandianxiyu_geek/article/details/78082551?utm_source=gold_browser_extension

最后发现，问题所在是因为网上的资料大部分都是针对私链的，而公链的转账是不一样的。。。啊。。。花费了两天的时间才试验出来

??????var myContract = new web3.eth.Contract(apiInterface, contractAddress);

??????// console.log(myContract.methods)

?????//合约查询账户余额

?????myContract.methods.balanceOf(currentAccount).call().then(data => {?

???????console.log('from balance:' + data)

?????})

//合约转账

??var txData = {

???????????to: contractAddress,

???????????value: web3.utils.toWei('0','ether'),//合约转账时，此值需设为0

???????????gas: this.chainGas,

???????????gasPrice: this.gasPrice,

???????????nonce: nonce,

???????????chainId: this.chainID,

???????????data: myContract.methods.transfer(toAddress, 10000).encodeABI(),

?????????}

????????web3.eth.accounts.signTransaction(txData, this.curAccount.decryptKey.privateKey)

?????????.then((data)=>{

??????????web3.eth.sendSignedTransaction(data.rawTransaction)

????????????.on('transactionHash', (data)=>{

??????????????console.log('ok')

????????????})

????????????.catch((data)=>{

??????????????console.log(data)

????????????})?????

???????????})

最后附上大神的私链代码供参考：

router.post('/transfer/token/sign.json', function (req, res) {

????const from????= req.body.from;

????const to??????= req.body.to;

????

????const symbol??= req.body.symbol;

????const key?????= req.body.key;

????var message = {};

????try{

???????const abi = fs.readFileSync( __dirname + '/abi/'+symbol+'.abi', 'utf-8');

???????const contractAddress = contracts[symbol];

???????const contract = new web3.eth.Contract(JSON.parse(abi), contractAddress, { "from": from});

??????contract.methods.balanceOf(from).call().then(function(balance){

??????????contract.methods.decimals().call().then(function(decimals){

??????????????const amount = new BigNumber(req.body.amount).toFixed(Number(decimals)).toString().replace(".","");

??????????????if(Number(amount) > Number(balance)){

?????????????????message = {"status": false, "code":1, "data":{"error":"balance = " + balance}};

?????????????????logger.error(message);

?????????????????res.json(message);

?????????????????return;

??????????????}

??????????

?????????????web3.eth.getGasPrice().then(function(gasPrice){

?????????????????var price = Number(gasPrice);

????????????????web3.eth.getTransactionCount(from).then(function(nonce){

????????????????????contract.methods.transfer(from, amount).estimateGas().then(function(gas){

????????????????????????var rawTransaction = {

???????????????????????????"nonce": web3.utils.toHex(nonce),

???????????????????????????"from": from,

???????????????????????????"to": contractAddress,

???????????????????????????"gas": web3.utils.toHex(gas),

???????????????????????????"gasPrice": web3.utils.toHex(price),

???????????????????????????// "gasLimit": this.web3.utils.toHex(gasLimit.gasLimit),

???????????????????????????"value": "0x0",

???????????????????????????"data": contract.methods.transfer(to, amount).encodeABI()

????????????????????????};

????????????????????????// console.log(`balance: ${balance}`);

????????????????????????// console.log(price);

????????????????????????// console.log(gas);

????????????????????????// console.log(amount);

????????????????????????// console.log(rawTransaction);

???????????????????????logger.debug(`/transfer/token/sign.json - gas: ${gas}, price: ${price}, cost: ${gas * price}, balance: ${balance}, amount: ${amount}, value: ${value}`);

????????????????????????// console.log(rawTransaction);

????????????????????????

????????????????????????var privateKey = new Buffer.from(key, 'hex');

????????????????????????var tx = new Tx(rawTransaction);

????????????????????????tx.sign(privateKey);

????????????????????????var serializedTx = tx.serialize();

??????????

???????????????????????web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex')).on('receipt', function(txhash){

???????????????????????????message = {"status":true, "code":0, "data":{"txhash":txhash}};

???????????????????????????logger.info(message);

???????????????????????????res.json(message);?

????????????????????????});?

?????????????????????});

?????????????????});

??????????????});

???????????});

???????});

????}catch(error){

???????message = {"status": false, "code":1, "data":{"error":error.message}};

???????logger.error(message);

???????res.json(message);

????};

????

});

[区块链]智能合约开发遇到的坑

使用Web3.js查询以太币和代币余额以及转账