Javascript - 如何迭代对象中的键值？

Question

var roles = {
    Guest: ["CAN_REGISTER"],
    Player: ["CAN_LOGIN", "CAN_CHAT"],
    Admin: ["CAN_KICK", "CAN_LOGIN", "CAN_CHAT"]
};

这是我的对象，我正在尝试检查用户是否具有特定的权限

get_perms: function(player, perm) {
    let arrayLength = accounts.length;
    let name = player.name;

    if (arrayLength == 0 && (perm == "CAN_CHAT" || perm == "CAN_LOGIN" || perm == "CAN_KICK")){
        return false;
    }

    for (var i = 0; i < arrayLength; i++)
    {
        if (accounts[i][0] == name)
        {
            for (var key in roles)
            {
                if (roles.hasOwnProperty(key))
                {
                    if (accounts[i][2] == key){

                        if (roles[key] == perm){
                            for (var x = 0; x < roles[key].length; x++){
                                if (roles[key][x] == perm){
                                    return true;
                                }
                            }
                        }
                    }
                }
            }
        }
        else{
            return false;
        }
    }
}

account[i][2]是与名称匹配的播放器的角色，我正在尝试检查该角色是否有perm发送给该函数，例如"CHAT_PERMS"

Answer 1

const roles = {
    Guest: ["CAN_REGISTER"],
    Player: ["CAN_LOGIN", "CAN_CHAT"],
    Admin: ["CAN_KICK", "CAN_LOGIN", "CAN_CHAT"]
};

const arr = Object.keys(roles).reduce((acc, cur) => [...acc, ...roles[cur]], []);
console.log(arr);
const rightSet = new Set(arr);
console.log(rightSet.has("CAN_CHAT"))

这是我使用ES6的解决方案：

1. 使用reduce with array spread语法创建一个平面数组，它为您提供[ "CAN_REGISTER", "CAN_LOGIN", "CAN_CHAT", "CAN_KICK", "CAN_LOGIN", "CAN_CHAT" ]
2. 将此数组保存在一组
中
3. 使用has()功能检查Set
中是否正确

Answer 2

使用for-loop和函数includes检查角色和权限。

var roles = {
    Guest: ["CAN_REGISTER"],
    Player: ["CAN_LOGIN", "CAN_CHAT"],
    Admin: ["CAN_KICK", "CAN_LOGIN", "CAN_CHAT"]
};

var playerRoles = ['Admin', 'Guest'];
var perm = 'CAN_LOGIN';

var found = false;
for (var role of playerRoles) {
  if ((found = roles[role].includes(perm))) {
    console.log("Permission '"+perm+"' found in Role '" + role + "'");
    break;
  }
}

if (!found) {
    console.log("Permission '"+perm+"' didn't found");
}