json键名中的双点

debugcn 发表于 Dev

西蒙

我正在使用nodejs，并且试图访问一个json键，该键包含一个双点：

 "elements": [
    {
        "type": "node",
        "id": 122509567,
        "lat": 50.9772739,
        "lon": 8.0544817,
        "tags": {
            "addr:city": "Hilchenbach",
            "addr:country": "DE",
            "addr:housenumber": "6",
            "addr:postcode": "57271",
            "addr:street": "Bernhard-Weiss-Platz",
            "amenity": "cinema",
            "name": "Viktoria-Kino Dahlbruch",
            "start_date": "1952-05-01",
            "toilets:wheelchair": "yes",
            "wheelchair": "yes"
        }
    },
    {
        "type": "node",
        "id": 269951105,
        "lat": 50.8768216,
        "lon": 8.0214439,
        "tags": {
            "addr:city": "Siegen",
            "addr:country": "DE",
            "addr:housenumber": "31",
            "addr:postcode": "57072",
            "addr:street": "Sandstraße",
            "amenity": "cinema",
            "level": "2",
            "name": "Cinestar",
            "wheelchair": "limited"
        }
    },

我当前的函数如下所示：

async function createCustomCinemaJson (json) {
 try {
     const cinemas = {};

     for (let i = 0; i < json.elements.length; i ++) {
         if(json.elements[i].lat | json.elements[i].tags.addr & json.elements[i].tags.name) {
             console.log(json.elements[i]);
         } else {
             console.log('No Way')
         }
         //cinemas.push(genres[k].name)
     }

     return json

 } catch (e) {

     console.error(e);

 }
}

目前访问“ json.elements [i] .lat”或“ json.elements [i] .tags.name”没有问题，但是我如何才能访问“ addr：housenumber”或“ addr：city”？

查尔拉卡

只需使用括号符号和字符串作为键名即可访问此类值。您可以通过访问的任何对象值object["keyname"]

参见下面的例子

var json = JSON.parse(document.getElementById('json').value);
var city = json.elements[0].tags['addr:city'];
console.log(city);

// If you need to iterate the keys because you don't know the name
// you can use for( keyname in object )

var tags = json.elements[0].tags, name;
for(name in tags) {
   if(tags.hasOwnProperty(name)) {
      console.log(name, '=', tags[name]);
   }
}

<textarea id="json">
 {
 "elements": [
    {
        "tags": {
            "addr:city": "Hilchenbach",
            "addr:country": "DE",
            "addr:housenumber": "6",
            "addr:postcode": "57271",
            "addr:street": "Bernhard-Weiss-Platz"
        }
    }
  ]
}
</textarea>

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