javascript 数组无法正确打印到控制台

Question

我将一些日期放入数组中，并希望该数组中的第二个“层”包含与该日期关联的订单号。它似乎工作正常，但是当我在 chrome 控制台中打印出数组时，我只看到第一个日期数组。如果我手动访问 console.log(dateArray[1]['order_number']);，我会看到预期的信息。我没有正确构造这个数组吗？

谢谢!

    for ( var u in valuesArr ) {

        //store the text seperator between the information and the order it is associated with
        var sep = "?order_num=";

        //store the string from which the information and order number will be extracted
        var str = valuesArr[u];

        //location of seperator
        var start = str.indexOf("?order_num=");

        var order_number = str.substring(start+sep.length);

        var current_date = valuesArr[u].substring(0, start);

        //date goes into "current_date" array
        current_date = current_date.split(" / ");

        //fashion it into a javascript date
        //month needs one subtracted
        dateArray[u] = new Date ( current_date[2], current_date[0]-1, current_date[1]);

        /*
        *to identify from which order this date derives, an order_number slot is created
        *underneath the sorted date slot
        *this is done so that when the html is reformatted to re-order the dates
        *the content associated with this date can be 'brought along with' it
        *as the its parent div's id contains the order number
        */
        dateArray[u]['order_number'] = order_number;

    }
    console.log(dateArray)//only outputs the array of dates
    console.log(dateArray[1]['order_number']);//outputs the order number

Answer 1

您对 dateArray[u]['order_number'] = order_number; 所做的是向 Date 对象添加属性，而不是向数组添加元素。

要向数组添加元素，请使用:

dateArray[u][1] = order_number;