javascript - JSON 文件中缺少值

Question

代码创建如下:

function create_story_json_file()
{
//Update the last edited page:

    img_dataURLs[current_page]= drawing_plate.toDataURL("image/png");
    create_display_img_url(current_page);

    var page_num= total_page_num;                               //Story total page number
    var page_cont= new Array();
    var page_view= new Array();

    //Page View:( as the pages is clicked, the page views have to be shown. 
        page_view= display_img_dataURL;


    var img_data_URL;           //if it's a variable only, you have to assign the first value in the declaration, or the tag would disappear. 
    var stamp_arr= new Array();
    var rec_arr= new Array();
    var background_msc; 


//For each Story:   
    alert("total_page_num :"+ total_page_num );
    for(var p_number=0 ; p_number < total_page_num ; p_number++)
    {
        img_data_URL= img_dataURLs[p_number];

    //Stamp
        stamp_arr= [];                                          //reset.    
        var stamp_arr_for_current_page= stamp_for_all_pages[ p_number ].arr;
        for(var stamp_num= 0; stamp_num < stamp_arr_for_current_page.length ; stamp_num++)
        {
            stamp_arr.push( stamp_arr_for_current_page[stamp_num].get_stmp_json_obj );

        }
        alert("stamp_arr.length is:" + stamp_arr.length);
    //Rec:
        rec_arr= [];
        var rec_objs_at_certain_page= records_pages_arr[ p_number ].rec_objs;
        for(var rec_num= 0; rec_num <  rec_objs_at_certain_page.length; rec_num++)
        {
            rec_arr.push( rec_objs_at_certain_page[ rec_num ].get_rec_json_obj );               //check if rec_objs_at_certain_page[ rec_num ] is a rec_object! 
        }
        alert("rec_arr length is: " + rec_arr.length);
    //Background_music:
        var bgr_msc_in_certain_page= back_ground_music_arr[ p_number ];
        alert ("bgr_msc_in_certain_page.created" + bgr_msc_in_certain_page.created);
        background_msc= bgr_msc_in_certain_page.get_bgr_msc_json_obj;





        var page_content_json_obj= {
            img_data_url: img_data_URL,
            stamp:stamp_arr,
            record: rec_arr,
            bgr_msc:  background_msc
        }

        page_cont.push(page_content_json_obj); 


    }


        var story_json_obj= {

        page_number: page_num, 
        page_content: page_cont,
                    page_img_view: page_view

        }

    //Change to JSON String and write it to the file.   
    story_json_str= JSON.stringify(story_json_obj);
}

我很困惑为什么结果 JSON 字符串:story_json_str 会是:

{"page_number":1,
"page_content":[{"img_data_url":"data:image/base64......lots of      character"}]}

没有别的，“page_content”中的“stamp”、“record”和“bgr_msc”在哪里？
为什么“page_img_view”也消失了？
为什么他们会错过？

请解释并更正代码。

Ps:我在Android系统上工作，通过HTML5的功能将JSON字符串存储到文件中。我没有可用的调试平台...

Answer 1

最终我发现了问题所在。

background_msc= bgr_msc_in_certain_page.get_bgr_msc_json_obj;

由于 get_bgr_msc_json_obj 是类中的函数，因此我需要编写get_bgr_msc_json_obj()。缺少括号将不会调用该函数。

这两个工具:get_rec_json_obj和get_stmp_json_obj犯了同样的错误。
多么愚蠢的错误。