访问嵌套属性 json

Accessing nested properties json(访问嵌套属性 json)

问题描述

我有这个 json:

{"objects":[{"text":{"x":643,"y":71,"width":82,"height":33,"font":"Arial","style":"bold","size":24,"label":"Part A"}},
{"text":{"x":643,"y":116,"width":389,"height":42,"font":"Arial","style":"bold","size":16,"label":"What does "novel" mean as it is used in paragraph 8 of "Turning Down a New Road"? "}},
{"radiobutton":{"x":643,"y":170,"width":100,"height":20,"label":"A. old"}},{"radiobutton":{"x":643,"y":209,"width":100,"height":20,"label":"B. afraid"}},
{"radiobutton":{"x":643,"y":250,"width":100,"height":20,"label":"C. new"}},
{"radiobutton":{"x":643,"y":289,"width":100,"height":20,"label":"D. friendly"}}]}

我需要获取每个元素的属性，但是我无法获取二级属性，我的意思是我不知道元素是文本"、单选按钮"、标签"，我三级属性没问题.

I need to get the properties of each element, but I can't get the property of second level, I mean I can´t know if the element is a "text","radiobutton","label", I have no problem with the propeties of third level.

这是我的来源:

                   $.ajax({
                        url: 'generateobject.php',
                        dataType: 'json',
                        type: 'GET'
                    }).done(function(data) {
                        $.each(data, function(index, firstLevel) {
                            $.each(firstLevel, function(anotherindex, secondLevel) {
                                alert(secondLevel[0]);//shows [object Object]
                                $.each(secondLevel, function(yetAnotherIndex, thirdLevel) {
                                    //alert(thirdLevel.y+''+thirdLevel.y);
                                });
                            });
                        });
                    });

如何获得二级属性?

推荐答案

使用 Object.keys(data) 并访问第一项.如果您运行该代码段，您应该会看到预期的类型警报:

Use Object.keys(data) and access the first item. If you run the snippet you should see the types alert as expected:

var data = {"objects":[{"text":{"x":643,"y":71,"width":82,"height":33,"font":"Arial","style":"bold","size":24,"label":"Part A"}},
{"text":{"x":643,"y":116,"width":389,"height":42,"font":"Arial","style":"bold","size":16,"label":"What does "novel" mean as it is used in paragraph 8 of "Turning Down a New Road"? "}},
{"radiobutton":{"x":643,"y":170,"width":100,"height":20,"label":"A. old"}},{"radiobutton":{"x":643,"y":209,"width":100,"height":20,"label":"B. afraid"}},
{"radiobutton":{"x":643,"y":250,"width":100,"height":20,"label":"C. new"}},
{"radiobutton":{"x":643,"y":289,"width":100,"height":20,"label":"D. friendly"}}]};


$.each(data, function(index, firstLevel) {
  $.each(firstLevel, function(anotherindex, secondLevel) {
    alert(Object.keys(secondLevel)[0]);
    $.each(secondLevel, function(yetAnotherIndex, thirdLevel) {
      //alert(thirdLevel.y+''+thirdLevel.y);
    });
  });
});

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