javascript - 二维对象/将数组关联到三维对象Javascript

Question

无论如何要形成这个

var stateDat = {
ME: ['Maine',1328361],
etc.
};

对此

var stateDatHistory = {
1:[
  ME: ['Maine',1328361],
  etc.
  ],
2:[
  ME: ['Maine',1328361],
  etc.
  ],
etc
};

动态地在一个函数中？例如，这不起作用……</p>

turn = 1;

function start(){
stateDatHistory[turn].push(stateDat);
stateDat['ME'][1]= stateDat['ME'][1] - 500; //changing population
turn++;
}

Answer 1

它的历史部分可能是一组对象。所以...

var stateDatHistory = [
   { ME: ['Maine', 1328361] }
];

或者，如果您需要通过键引用历史中的每个“步骤”，它可能是一个对象，其数组值包含对象......

var stateDatHistory = {
    1: [
        { ME: ['Maine', 12334] }
    ]
}

在后一种情况下，“开始”代码将类似于...

turn = 1

function start() {
    if (typeof stateDatHistory[turn] === 'undefined') {
        stateDatHistory[turn] = [];
    }
    stateDatHistory[turn].push(stateDat);
    stateDat['ME'][1]= stateDat['ME'][1] - 500; //changing population
    turn++;
}

说了这么多，我想提一下，使用一个对象来包含所有这些状态数据将是一个不错的决定。例如考虑...

// Define our manager
var stateDatManager = function() { };
(function(instance) {

    instance.init = function() {
        // Setup internal state
        this.history = {};
        this.turn = 0;
        this.initialized = true;
    };

    instance.start = function(turn, data) {
        if (!this.initialized) { this.init(); }
        this.turn = turn;
        this.addToHistory(data);
    };

    instance.addToHistory(data) {
        if (typeof this.history[this.turn] === 'undefined') {
            this.history[this.turn] = [];
        }
        this.history[this.turn].push(data);
    };

    instance.advanceTurn() {
        this.turn += 1;
    };

}(stateDatManager.prototype));

// Use it
var manager = new stateDatManager();
manager.start(1, [
    { ME: ['Maine', 1328361] }
]);

// Move to the next turn...
manager.advanceTurn();

// etc.