Node.js - Errors模块

// 抛出 ReferenceError 因为 b 未定义
try {
  const a = 1;
  const c = a + b;
} catch (err) {
  console.log(err);
}

node error_example1.js

const fs = require('fs');
function nodeStyleCallback(err, data) {
 if (err) {
   console.error('There was an error', err);
   return;
 }
 console.log(data);
}
fs.readFile('/some/file/that/does-not-exist', nodeStyleCallback);
fs.readFile('/some/file/that/does-exist', nodeStyleCallback);

node error_example2.js