JavaScript错误处理指南之Node.js

const net = require("net");
const server = net.createServer().listen(8081, "127.0.0.1");
server.on("listening", function () {
  console.log("Server listening!");
});
server.on("connection", function (socket) {
  console.log("Client connected!");
  socket.end("Hello client!");
});
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const net = require("net");
const server = net.createServer().listen(80, "127.0.0.1");
server.on("listening", function () {
  console.log("Server listening!");
});
server.on("connection", function (socket) {
  console.log("Client connected!");
  socket.end("Hello client!");
});
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events.js:291
      throw er; // Unhandled 'error' event
      ^
Error: listen EACCES: permission denied 127.0.0.1:80
Emitted 'error' event on Server instance at: ...
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server.on("error", function(error) {
  console.error(error.message);
});
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listen EACCES: permission denied 127.0.0.1:80
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