javascript - 为什么 Javascript 对象不更新字段？

Question

下面我有以下代码:

var imageType = "BoxArt";
var uploadReason = "New season";
var fileKey = "b2fc";

alert("imageType = " + imageType);
alert("uploadReason = " + uploadReason);
alert("fileKey = " + fileKey);

var iVO = { "images":{}};
var thisImage = fileKey;
iVO["images"][thisImage.fileKey] = thisImage;
iVO["images"][thisImage.imageType] = imageType;
iVO["images"][thisImage.uploadReason] = uploadReason;

alert("iVO['images'][thisImage.imageType] = " + iVO["images"][thisImage.imageType]);
alert("iVO['images'][thisImage.uploadReason] = " + iVO["images"]    [thisImage.uploadReason]);
alert("iVO['images'][thisImage.fileKey] = " + iVO["images"][thisImage.fileKey]);
alert("JSON.stringify(iVO):\n" + JSON.stringify(iVO));

当我执行此命令时，我得到以下输出:

imageType = "BoxArt"
uploadReason = "New season"
fileKey = "b2fc"
iVO['images'][thisImage.imageType] = "New season"
iVO['images'][thisImage.uploadReason] = "New season"
iVO['images'][thisImage.fileKey] = "New season"
JSON.stringify(iVO):
{"images"}:{"undefined":"New season"}}

这是怎么回事？!？!？

前三个警报(显示 imageType、uploadReason 和 fileKey 分配)符合预期，但 iVO code> 对象的行为根本不像我预期的那样。 JSON.stringify 方法是正常的 json2.js方法，我没有修改它。

为什么“新赛季”显示为每个 iVO["images"] 字段值？为什么没有 iVO 分配好好工作？!？ 我需要做什么来修复它们？

JSON.stringify(iVO) 的所需输出将是(以 pretty-print 形式):

{
    "images":
    {
        "b2fc":
        {
            "imageType":"BoxArt",
            "uploadReason":"New season",
            "fileKey":"b2fc"
        }
    }
}

提前致谢!

Answer 1

当然，你定义的位置

iVO["images"][thisImage.fileKey] = thisImage;
iVO["images"][thisImage.imageType] = imageType;
iVO["images"][thisImage.uploadReason] = uploadReason;

thisImage 是之前分配给 fileKey 的字符串，因此 thisImage.fileKey、thisImage.imageType 和 thisImage.uploadReason 是无效引用

可能你想做一些类似的事情 iVO["images"][fileKey]["imageType"] = imageType