Question

我有一些数据：

{
    "_id": ObjectId("528ae48e31bac2f78431d0ca"),
    "altitude": "110",
    "description": [
        {
            "id": "2",
            "des": "test"
        }
    ],
    "id": "1",
    "latitude": "24.9528802429251",
    "longitude": "121.509316013427",
    "name": "H hotel"
}

我希望得到描述长度并显示它的上下文

请帮助我!!

Answer 1

这是一个JSON数据，您可以对该数据进行字符串解析。

var data = JSON.stringify({
    "_id": "ObjectId(528ae48e31bac2f78431d0ca)",
    "altitude": "110",
    "description": [
        {
            "id": "2",
            "des": "test"
        }
    ],
    "id": "1",
    "latitude": "24.9528802429251",
    "longitude": "121.509316013427",
    "name": "H hotel"
})

var parseData = JSON.parse(data)

parseData.description.length
1


parseData.description[0].id
"2"
parseData.description[0].des
"test"

建议：您可以在此格式之外获取ObjectId（528ae48e31bac2f78431d0ca）的值，并将其作为String传递给_id值

Answer 2

首先，你需要验证你的json，

{
    "_id": "528ae48e31bac2f78431d0ca",
    "altitude": "110",
    "description": [
        {
            "id": "2",
            "des": "test"
        }
    ],
    "id": "1",
    "latitude": "24.9528802429251",
    "longitude": "121.509316013427",
    "name": "H hotel"
}

这是一个有效的json。现在你可以像这样做 -

$.getJSON('assets/json/demo.json', function(data) {
                $.each(data, function(key, value){
                    if(key === 'description'){
                        var description_length = value.length;

                    }
                });
            });

要显示其内容，您可以再次循环“描述”一些类似的内容 -

$.each(value, function(index, val){
   alert(index+'-'+val);
});

Answer 3

您没有提供太多信息，但这里是一个概述。我假设你有一个JSON 字符串而不是一个对象。我会称他为“Jason Data”......或者更确切地说是jsonData。

这样的东西用于说明目的（只有没有新的行，因为你不能以这种方式在JavaScript中执行多行字符串，但你明白了）：

// Jason Data, head full of doubt, road full of promises
var jsonData = '{
    "_id": "528ae48e31bac2f78431d0ca",
    "altitude": "110",
    "description": [
        {
            "id": "2",
            "des": "test"
        }
    ],
    "id": "1",
    "latitude": "24.9528802429251",
    "longitude": "121.509316013427",
    "name": "H hotel"
}';

然后治疗我们的门诊病人Jason Data：

// let's get his Mona Lisa
var data = JSON.parse(jsonData);

// since he holds numerous memories, let's first get the count (as you wish)
var numDescriptions = data.description.length;

// as if we were psychiatrists, we will now analyze each of his experiences
for ( var i = 0; i < numDescriptions; i++ ) {
    // and write a poem about his life. (even though this goes against doctor-patient privilege, sue me)
    console.log(data.description[i].id,data.description[i].des);
}

Answer 4

你的问题不明确，无论如何，如果你想获得与关键“描述”相对应的价值，那么试试这个yourdata.description来获得它的价值

我已在http://jsfiddle.net/twmSk/1/

创建了这些步骤

//storing your data into variable yourdata
var yourdata = {
    "_id": ObjectId("528ae48e31bac2f78431d0ca"),
    "altitude": "110",
    "description": [
        {
            "id": "2",
            "des": "test"
        }
    ],
    "id": "1",
    "latitude": "24.9528802429251",
    "longitude": "121.509316013427",
    "name": "H hotel"
}

$('#test').html(JSON.stringify(yourdata.description))

如何从json数组长度和上下文中获取一些数据

4 个答案: