js 許可權二進位制

const READ = 0b1;
const CREATE = 0b10;
const UPDATE = 0b100;
const DELETE = 0b1000;

const rights = READ | UPDATE | DELETE //組合許可權讀 更新 刪除 13
console.log(rights) //13
if ((rights && READ) === 1) {
  console.log('有read許可權')
} else {
  console.log('沒有read許可權')
}
if ((rights ^ READ) === 0b1100) {
  console.log('刪除read許可權')
} else {
  console.log('有read許可權')
}