Question

我正在尝试将令牌转移到其他地址。在调用传递函数之前，我先调用estimateGas()来估计所需的气体。

下面提到了代码：

var count = await web3Config.web3.eth.getTransactionCount(process.env.OWNER_ADDRESS);
        var data = web3Config.contractInstance.methods.transfer(req.body.address, req.body.amount*Math.pow(10,18)).encodeABI();

        var estimatedGasPrice = await web3Config.web3.eth.estimateGas({
          from : process.env.OWNER_ADDRESS,
          to:   process.env.CONTRACT_ADDRESS,
          data : data
        });

          logs.error(estimatedGasPrice)
          var rawTx = {
              from : process.env.OWNER_ADDRESS,
              to:   process.env.CONTRACT_ADDRESS,
              data : data,
              nonce: "0x" + count.toString(16),
              gasPrice: web3Config.gasPrice,
              value: '0x0',
              gasLimit: estimatedGasPrice,
              chainId: 3
          }

          var tx = new Tx(rawTx);
          tx.sign(web3Config.ownerPrivKey);
          var serializedTx = tx.serialize();

          var receipt = await web3Config.web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex'));
          res.send(receipt)
          logs.log(receipt)

我的合同中的小数位是 18 。

如果我想转移1 token，则由于小数点需要将其转换为1000000000000000000。

问题在req.body.amount*Math.pow(10,18)行中。当我尝试转移超过100000的令牌时，它给出了如下所述的异常：

Error: [number-to-bn] while converting number 1e+22 to BN.js instance, error: invalid number value. Value must be an integer, hex string, BN or BigNumber instance. Note, decimals are not supported. Given value: "1e+22"
warning.js:18
    at toBN (/home/akshay/WS/ethereum/node_modules/web3-utils/src/utils.js:64:15)
    at Object.toTwosComplement (/home/akshay/WS/ethereum/node_modules/web3-utils/src/utils.js:77:18)
    at SolidityTypeUInt.formatInputInt [as _inputFormatter] (/home/akshay/WS/ethereum/node_modules/web3-eth-abi/src/formatters.js:44:36)
    at SolidityTypeUInt.SolidityType.encode (/home/akshay/WS/ethereum/node_modules/web3-eth-abi/src/type.js:188:17)
    at /home/akshay/WS/ethereum/node_modules/web3-eth-abi/src/index.js:255:29
    at Array.map (<anonymous>)
    at ABICoder.encodeParameters (/home/akshay/WS/ethereum/node_modules/web3-eth-abi/src/index.js:254:34)
    at /home/akshay/WS/ethereum/node_modules/web3-eth-contract/src/index.js:420:24
    at Array.map (<anonymous>)
    at Object._encodeMethodABI (/home/akshay/WS/ethereum/node_modules/web3-eth-contract/src/index.js:419:12)
    at main (/home/akshay/WS/ethereum/routes/blockchain.js:55:116)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)

它超出了数字范围。

任何帮助/建议将不胜感激。

Answer 1

如果您在控制台中键入value，则会看到该值太大而无法通过javascript转换该值。

> 1*Math.pow(10,18)

1000000000000000000

> 100000000000000*Math.pow(10,18)

1e+32

我认为您可以使用web3 bn对象来存放或计算令牌。

或者您也可以使用web3 toWei来做同样的事情。

如果令牌的十进制数为18（例如以太坊与wei），那么您只需使用toWei(1, 'ether')即可获取令牌数量。

Web3js传输令牌

1 个答案: