为什么只记录了我的 json 数据的一部分？

Question

我试图最终将我的 json 数据显示在标签中。但是，当我 console.log json 数据时，只显示最后两个对象。当我将数据传递给标签时，只显示最后一个对象。提前感谢您的帮助！

这是我的代码：

var json = 
    {
        "Question:": " What is my name? ",
        "Answer:": " James ",
        "Question:": " What is my age? ",
        "Answer:": " 31 "

    };

for (var key in json)
{
    if (json.hasOwnProperty(key))
    {
        console.log(key + " = " + json[key]);

    }

}
var label = Ti.UI.createLabel({
    text: key + json[key]
});



win3.add(label);

Answer 1

您的问题与 Titanium 无关。在 JavaScript 字典中，您不能有两个具有不同值的相同键。为了证明你在哪里犯了错误，我将重写你的第一行：

var json = {};
json["Question:"] = " What is my name? ";
json["Answer:"] = " James ";
// We are fine untill now.
json["Question:"] = " What is my age? ";
json["Answer:"] = " 31 ";
// Here you overwrote values for keys "Question:" and "Answer:" which were set above.

为了解决您的问题，我会将您的 json 字典更改为字典数组：

var i, key, label;
var json = [
    {
        "Question:": " What is my name? ",
        "Answer:": " James ",
    },
    {
        "Question:": " What is my age? ",
        "Answer:": " 31 "
    }
];

for (i in json) {
    for (key in json[i]) {
        label = Ti.UI.createLabel({
            text: key + json[i][key]
        });
        win3.add(label);
    }
}

Answer 2

你的 json 对象键是重复的，javascript 不会抱怨，它只会用第二个值覆盖第一个键值