循环遍历包含布尔值的对象

var checkboxes = document.querySelectorAll('input[type="checkbox"]');
for (var i = 0; i < checkboxes.length; i++) {
  if (checkboxes[i].checked) {
    console.log('第' + (i+1) + '个复选框被选中了');
  } else {
    console.log('第' + (i+1) + '个复选框未被选中');
  }
}

var switches = document.querySelectorAll('.switch');
for (var i = 0; i < switches.length; i++) {
  if (switches[i].classList.contains('on')) {
    console.log('第' + (i+1) + '个开关按钮是打开状态');
  } else {
    console.log('第' + (i+1) + '个开关按钮是关闭状态');
  }
}

import psycopg2

conn = psycopg2.connect(database="mydb", user="myuser", password="mypassword", host="localhost", port="5432")
cur = conn.cursor()

cur.execute("SELECT id, name, is_active FROM users")
rows = cur.fetchall()

for row in rows:
  user_id = row[0]
  user_name = row[1]
  is_active = row[2]
  
  if is_active:
    print('用户', user_name, '是活跃的')
  else:
    print('用户', user_name, '是不活跃的')

conn.close()