没有指定网络。无法确定当前网络

Question

如何解决以下问题？

 $ truffle migrate
    Error: No network specified. Cannot determine current network.
        at Object.detect (C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\truffle-core\lib\environment.js:31:1)
        at C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\truffle-core\lib\commands\migrate.js:91:1
        at finished (C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\truffle-workflow-compile\index.js:53:1)
        at C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\truffle-compile\index.js:314:1
        at C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\truffle-compile\profiler.js:158:1
        at C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\~\async\dist\async.js:3888:1
        at C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\~\async\dist\async.js:473:1
        at replenish (C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\~\async\dist\async.js:1006:1)
        at iterateeCallback (C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\~\async\dist\async.js:995:1)
        at C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\~\async\dist\async.js:969:1
        at C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\~\async\dist\async.js:3885:1
        at C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\truffle-compile\profiler.js:154:1
        at C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\~\async\dist\async.js:1140:1
        at C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\~\async\dist\async.js:473:1
        at iteratorCallback (C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\~\async\dist\async.js:1064:1)
        at C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\~\async\dist\async.js:969:1
        at C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\~\async\dist\async.js:1137:1
        at C:\Users\Welcome\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\truffle-compile\profiler.js:133:1
        at FSReqWrap.oncomplete (fs.js:153:5)

Answer 1

您必须在truffle.js文件中指定一个网络。你应该有这样的东西：

module.exports = {
  networks: {
    my_ganache: {
      host: "127.0.0.1",
      port: 7545,
      network_id: "*"  
    }
  }
};

然后在所有命令中使用--network my_ganache。EXP：

truffle migrate --network my_ganache 

当然，在这种情况下，应该在端口7545下运行ganache。