Question

我需要一个数据结构来存储多个JavaScript对象，并且能够使用字符串id（get / set / delete操作）访问它们。

以下是我需要存储的项目示例：

var Player = function(name) {
  this.name = name;
  this.x = 0;
  this.y = 0;
  this.toString = function() {
    return 'player : ' + this.name + ' at ' + this.x + ', ' + this.y;
  };
}

我想将玩家存储在一个数据结构中，并且能够通过他们的名字来获取/设置/删除它们，例如players.get('Bob')以获得名为Bob的玩家。

起初，我以为我可以使用名称为关键的地图（我正在使用来自collectionsjs的Dict）。但是我无法从项目的方法中访问该名称（在我的示例中为toString）。

我可以使用常规数组，保留name属性并实现我自己的get / set / delete方法，但我宁愿使用可靠的数据结构，但我找不到它。

提前致谢：]

Answer 1

Javascript对象可行。

var players = [];
players[0] = {"name":"Bob", "age":1};
players[1] = {"name":"John", "age":4};

for (var i in players) {
    if (players[i].name == "Bob") {
        alert("Bob is " + players[i].age);
    }
}

编辑：

var players = [];
players[0] = {"name":"Bob", "age":1};
players[1] = {"name":"John", "age":4};

players.forEach(function(player){
    if (player.name == "Bob") {
        alert("Bob is " + player.age);
    }
});

Answer 2

var Players = function(){
    this.players = [];
    this.add = function(player){
        this.players.push(player);
    }
    this.delete = function(name){
        for(var i=0;i<this.players.length;i++)
            if(this.players[i].name==name)
            {
                var f = this.players.slice(i+1,this.players.length+1);
                this.players = this.players.slice(0,i).concat(f);
                return;
            }
    }
    this.set = function(name,player){
            for(var i=0;i<this.players.length;i++)
            if(this.players[i].name==name)
            {
                this.players[i] = player;
                return;
            }
    }
    this.show = function(){
        for(var i=0;i<this.players.length;i++)
            console.log(this.players[i].toString());
    }
}

var p = new Players();
p.add(new Player('Lorem'));
p.add(new Player('Ipsum'));
p.show();
p.delete('Ipsum');
p.show();

Answer 3

阵列的不可靠性是什么？使用内置方法IMO。一个简单的例子：

var players = [];

var Player = function(name) {
    this.name = name;
    this.x = 0;
    this.y = 0;
    this.toString = function() {
        return 'player : ' + this.name + ' at ' + this.x + ', ' + this.y;
    };
}

function getPlayerByName(name){
    return players.filter(function(p){
        return p.name.toLowerCase() === name.toLowerCase();
    })[0];
}

// etc...
players.push(new Player('foo'));

var fetched = getPlayerByName('foo');

console.log(fetched);

http://jsfiddle.net/cy39sqge/

JavaScript数据结构：键值/值，具有键访问权限

3 个答案: