js 对象属性拼接

const person = {
  firstName: 'John',
  lastName: 'Doe',
  age: 30
};

const fullName = `${person.firstName} ${person.lastName}`;
console.log(fullName); // 输出: John Doe

const fullName2 = person.firstName + ' ' + person.lastName;
console.log(fullName2); // 输出: John Doe

const fullName3 = [person.firstName, person.lastName].join(' ');
console.log(fullName3); // 输出: John Doe

const person = {
  firstName: 'John',
  lastName: 'O\'Reilly'
};

const safeFullName = `${JSON.stringify(person.firstName).slice(1, -1)} ${JSON.stringify(person.lastName).slice(1, -1)}`;
console.log(safeFullName); // 输出: John O'Reilly

const person = {
  firstName: 'John',
  lastName: undefined
};

const safeFullName = `${person.firstName || ''} ${person.lastName || ''}`.trim();
console.log(safeFullName); // 输出: John