如何使用 JavaScript 实现一个简单的验证码系统？

// Generate a random code
var code = Math.random().toString(36).substring(2, 10);

// Print the code
console.log('Your code is: ' + code);

// Get the user's input
var input = prompt('Enter verification code:');

// Compare user input with the generated code
if (input === code) {
  console.log('Correct!');
} else {
  console.log('Incorrect!');
}