infura調用需gasfee的ERC721合約功能

官方文檔:

https://docs.infura.io/infura/tutorials/ethereum/call-a-contract

 

由於開發時，官方文檔未更新，所以用另外的方法來實現。

1.0 install @ethereumjs/tx

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1	npm install @ethereumjs/tx

　　

2.0 convect object to bytes

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async function getContractRaw(txCount, data) {     var gasPrice = await web3.eth.getGasPrice();     curGasPrice = gasPrice;     var txParams = {       nonce: web3.utils.toHex(parseInt(txCount)),       gasLimit: web3.utils.toHex(60000*4),       gasPrice: web3.utils.toHex(gasPrice),       to: contractAddress,       value: '0x00',       data: data,     };     var tx = new EthereumTx.Transaction(txParams, {chain: network});     tx.sign(_privateKey)     var serializedTx = tx.serialize();     return '0x' + serializedTx.toString('hex'); }

　　Also, encrypt your private key in bytes.

3.0 call ERC721 funcs using sendSignedTransaction

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var raw = await getContractRaw(txCount, data);   web3.eth.sendSignedTransaction(raw)   .on('transactionHash', function(_hash){})   .on('receipt', function(receipt){})   .on('confirmation', function(confirmationNumber, receipt){     res.jsonp({result: {transactionHash: hash, effectiveGasPrice: curGasPrice}});   })   .on('error', console.error);

　　sendSignedTransaction() allows you to call ERC721 funcs that requires gas fee.