使用jQuery获取JSON中的键/值对中的键名称?

问题描述：

说我有这个JSON:

[
    {
        "ID": "1",
        "title": "Title 1",
    },
    {
        "ID": "2",
        "title": "Title 2",
    }
]

如何返回每个记录重复出现的一组键名?在这种情况下，为ID, title.

How would I return the set of key names that recur for each record? In this case, ID, title.

我尝试过:

$.getJSON('testing.json', function(data) {
  var items = [];
  $.each(data, function(key, val) {
    items.push(key +', ');
  });

  $('<p/>', {
     html: items.join('')
  }).appendTo('#content');
});

没有成功.

这是一个JSON数据库"，每个记录"具有相同的键.我只想要一个脚本，该脚本可以告诉我键是什么，而不是测试它们是否出现在每个条目中.

This is a JSON "database", and every "record" has the same keys. I just want a script that will tell me what the keys are, not test whether or not they occur in every entry.

答

这将为您提供与对象数组匹配的所有字符串属性的数组.那是您要找的东西吗?

This will give you an array of all the string properties that match across an array of objects. Is that what you are looking for?

$.getJSON('testing.json', function(data) {
    var propertiesThatExistInAll = getPropertiesThatExistInAll(data);
});


var getPropertiesThatExistInAll = function(arr) {
    var properties = $.map(data[0], function (prop, value) {
        return prop;
    });

    var propertiesThatExistInAll = [];

    $.each(properties, function (index, property) {
        var keyExistsInAll = true;

        // skip the first one since we know it has all the properties
        for (var i = 1, len = data.length; i < len; i++) {
            if (!data[i].hasOwnProperty(property)) {
                keyExistsInAll = false;
                break;
            }
        }

        if (keyExistsInAll) {
            propertiesThatExistInAll.push(property);
        }
    });

    return propertiesThatExistInAll;
};

使用jQuery获取JSON中的键/值对中的键名称?

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