如何从文件中获取JSON数组的getJSON？ [英] How to get JSON array from file with getJSON?

问题描述

我怎么能得到一个JSON文件的数组使用Javascript和jQuery

How could I get an array json of a json file with javascript and jquery

我的下一个code triyng，它不工作：

I was triyng with the next code, with it doesnt work:

var questions = [];
function getArray(){
    $.getJSON('questions.json', function (json) {
        for (var key in json) {
            if (json.hasOwnProperty(key)) {
                var item = json[key];
                questions.push({
                    Category: item.Category
                });
            }
        }
        return questions;
    })
}

这就是所谓的JSON文件：questions.json

this is the json file called: questions.json

{
"Biology":{
    "Category":{
        "cell":{
            "question1":{
                "que1":"What is the cell?"
            },
            "option1":{
                "op1":"The cell is the basic structural and functional unit",
                "op2":"is a fictional supervillain in Dragon Ball"
            },
            "answer1":"opt1"
        }
    }
},
"Astronomy":{
    "Category":{
        "Mars":{
            "question1":{
                "que1":"How many moons does Mars?"
            },
            "option1":{
                "op1":"5",
                "op2":"2"
            },
            "answer1":"opt2"
        }
    }
}
}

我希望得到这种格式的数组{生物学：{类别：{细胞：{问题1 ....}}}}

I want to get an array with this format {Biology:{Category:{cell:{question1....}}}}

推荐答案

$。的getJSON 是一个异步函数，因此返回该函数内部的东西什么都不做，因为它不是在范围上，还是没有收到。你应该这样做：

$.getJSON is an asynchronous function, so returning something inside that function does nothing, as it's not in scope, or received yet. You should probably do something like:

function getArray(){
    return $.getJSON('questions.json');
}

getArray().done(function(json) {
    // now you can use json
    var questions = [];
    $.each(json, function(key, val) {
        questions[key] = { Category: val.Category };
    });
});

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