运行ning { PORT=4001 npm 运行 test} 此命令时出现节点 JS 错误

Question

var app= express();
const port=process.env.PORT || 4000;

app.listen(port,function(){
    console.log('Listen on port '+port);
});

当我运行这个命令 $PORT=4001 npm run test

我看到这个错误

PORT=4001 : The term 'PORT=4001' is not recognized as the name of a cmdlet, function, script file, or operable
program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ PORT=4001 npm run test
+ ~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (PORT=4001:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Answer 1

您似乎是运行 PowerShell 下的这个，但使用了某人使用 Unix/Linux shell 的示例。让它成为两个命令

$Env:PORT = "4001"
npm run test

运行ning { PORT=4001 npm 运行 test} 此命令时出现节点 JS 错误

Node JS error while running { PORT=4001 npm run test} this command

javascript

port

node.js