Javascript 对象数量

Question

假设我有一个记录数据库，此处称为 recordDOM，并且我需要分割其长度以适应特定的大​​小限制。

以下代码片段不起作用。它产生一个 TypeError: TypeError: packet[packetCount] is undefined

var packet = {};
var packetCount = 0;
var elementCount = 0;

$.each(recordDOM, function(index, element) {
    if (elementCount >= 168) {
        packetCount++;
        elementCount = 0
    }

    if (typeof element != "undefined") {
        packet[packetCount][elementCount] = element;
    }
    elementCount++;
});

我已经尝试将packet变量初始化为数组，并对上面的代码进行了一些其他小的编辑，但我显然遗漏了一些东西。可以请您赐教吗？

[编辑]所需的输出是:

packet = {
    "0": {
        "0": {
            // First Element
        },
        "1": {
            // Second Element
        },
        ...
        "167": {
            // Last element of the first packet
        }
    },
    "1": {
        "0": {
            // First Element of the second packet
        },
        "1": {
            // Second Element
        },
        ...
        "167": {
            // Last element of the second packet
        }
    }
}

Answer 1

你只需要初始化内部对象，

var packet = {};
var packetCount = 0;
var elementCount = 0;

$.each(recordDOM, function(index, element) {
    if (elementCount >= 168) {
        packetCount++;
        elementCount = 0
    }

    if (element != undefined) {
        if(!packet[packetCount]){
          packet[packetCount] = {};      // Change is here
        }
        packet[packetCount][shipCount] = element;
    }
    shipCount ++;
});