訪問嵌套屬性 json

Question

我有這個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"}}]}

我需要獲取每個元素的屬性，但是我無法獲取第二級的屬性，我的意思是我不知道元素是“文本”、“單選按鈕”、“標簽”，我沒有問題具有三級屬性。

這是我的來源：

                   $.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);
                                });
                            });
                        });
                    });

如何獲得二級屬性？

Answer 1

使用Object.keys(data)並訪問第一項。 如果您運行該代碼段，您應該會看到預期的類型警報：

 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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