Dapp本地测试用Ganache-cli 能够正常交互，truffle migrate --network ropsten部署到ropsten后出现合约交互(transact)一直失败，测试已检查Metamask连接网络的chainID 和url都匹配无误。

版本：truffle 5.15, soildity 0.5.16  npm 6.14.3

代码如下：

const dotenv=require('dotenv');
const result=dotenv.config();
if (result.error){
  throw result.error;
}
console.log(result.parsed);
var NonceTrackerSubprovider = require("web3-provider-engine/subproviders/nonce-tracker");
var HDWalletProvider = require("truffle-hdwallet-provider");
var infura_apikey=myprojectID;
var mnemonic_ropsten=process.env.mnemonic_ropsten;//存储在.env文件中
module.exports = {
   networks: {
     development: {//本地测试
       host: "127.0.0.1",
       port: 7545,
       network_id: "*", // Match any network 
       gas : 3000000000
     },
    ropsten:{
      provider :new HDWalletProvider(mnemonic_ropsten,"https://ropsten.infura.io/v3/"+myprojectID),
      network_id: 3,
      gas: 7003605,
      gasPrice: 100000000000,
      networkCheckTimeout: 600000
    }
  }
};