访问嵌套属性json

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，但我不能得到二级属性，我的意思是我不知道该元素是“文本”，“radiobutton”，“标签”，我没有问题与第三级的职业。

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); }); }); }); }); 

我如何获得二级财产？

Answer 1

使用Object.keys(data)并访问第一项。 如果您运行代码段，您应该按预期看到类型提醒：

 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); }); }); });