JavaScript 中 if 嵌套 assert 的方法

function assert(condition, message = 'Assertion failed') {      if (!condition) {          throw new Error(message);      }  }

function checkUserQualifications(user) {      // 假设user对象包含age, profession, hasSignedAgreement属性            // 检查年龄是否大于等于18      assert(user.age >= 18, 'User must be at least 18 years old.');        // 进一步的检查，根据职业      if (user.profession === 'teacher') {          // 教师有特殊的资格要求          assert(user.hasSpecialTeacherQualification, 'Teachers must have special qualification.');      } else if (user.profession === 'doctor') {          // 医生需要医学执照          assert(user.hasMedicalLicense, 'Doctors must have a medical license.');      } else {          // 其他职业，确保签署了协议          assert(user.hasSignedAgreement, 'All users must sign the agreement.');      }        // 如果所有检查都通过，执行某些操作      console.log('User qualifications are met. Proceeding with the operation.');  }    // 示例用户数据  const user1 = {      age: 25,      profession: 'teacher',      hasSpecialTeacherQualification: true,      hasSignedAgreement: true  };    const user2 = {      age: 30,      profession: 'doctor',      hasMedicalLicense: false, // 故意设置为false以触发断言错误      hasSignedAgreement: true  };    // 测试user1  try {      checkUserQualifications(user1);  } catch (error) {      console.error(error.message);  }    // 测试user2  try {      checkUserQualifications(user2);  } catch (error) {      console.error(error.message); // 应输出：Doctors must have a medical license.  }