Javascript-如何遍历对象中键的值？

Question

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

that is my object and I am trying to check if the user has specific perms

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] is the role of the player which matches the name, I am trying to check if that role has perm which is sent to the function, for example "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"))

This is my solution using ES6:

1. Use reduce with array spread syntax to create a flat array, which give you [ "CAN_REGISTER", "CAN_LOGIN", "CAN_CHAT", "CAN_KICK", "CAN_LOGIN", "CAN_CHAT" ]
2. Save this array in a set
3. Use has() function to check if the right in the Set

Answer 2

Use a for-loop and the function includes to check the role and permission.

 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"); }