Question

你好我想获得那种数据库格式：

 2013-10-10, 4, username1
 2013-10-10, 20, username2
 2013-10-12, 1, username1

到一个看起来像这样的数组：

 Array(
 [0] =>
 Array(
    [timestamp] => 2013-10-10,
    [username1] => 4, *from username1*
    [username2] => 20 *from username2*    
 [1] =>
 Array(
    [timestamp] => 2013-10-12,
    [username1] => 1
      )

）

我试过了：

function generatedata(data)
{
    var datas = [];
    for (item in data)
    {
       // console.log(data[item]['qty']); Logs well as numbers
        var dater = data[item]['timestamp'];
            if (!datas.hasOwnProperty(dater))
            {
                datas[dater] = [];
                var date = new Date(data[item]['timestamp'].replace(' ', 'T'));
                datas[dater]['date'] = date;
            }
        datas[dater][data[item]['name']] += data[item]['qty']; // gets assined as undefinedXX like undefined22 

    }
return datas;
}

由名称确定的值为'undefined22'或'undefined1'，即使我检查其是否存在损失我使用PHP和JavaScript 甚至没有想法

Answer 1

试试这个：

var timestamp_to_id = {};
var last_id = 0;

var out = [];

for(var i = 0, data; data = datas[i++];)
{
    var timestamp = new Date(data[0].replace(' ', 'T'));
    var qty = data[1];
    var username = data[2];

    var id = timestamp_to_id[timestamp];
    if (id === undefined) {
        id = timestamp_to_id[timestamp] = last_id ++;
        out[id] = { timestamp: timestamp };
    }

    out[id][username] = qty;
}

http://jsfiddle.net/hWwtL/

请参阅控制台（F12）

javascript数组值被定义为undefined

1 个答案: