var portfinder = require(‘portfinder‘); portfinder.getPort(function (err, port) { // // `port` is guaranteed to be a free port // in this scope. // });
Promise形式
const portfinder = require(‘portfinder‘); portfinder.getPortPromise() .then((port) => { // // `port` is guaranteed to be a free port // in this scope. // }) .catch((err) => { // // Could not get a free port, `err` contains the reason. // });
By default portfinder will start searching from 8000 and scan until maximum port number (65535) is reached.
You can change this globally by setting:
portfinder.basePort = 3000; // default: 8000 portfinder.highestPort = 3333; // default: 65535
默认端口从8000扫描到65535，上面两个方法可以i实现自定义扫描范围
or by passing optional options object on each invocation:
portfinder.getPort({ port: 3000, // minimum port stopPort: 3333 // maximum port }, callback);
原文：https://www.cnblogs.com/cangqinglang/p/10770297.html