Question

我有这个JSON文件：http://danish-regional-data.googlecode.com/svn/trunk/danish_regional_data.json

如何删除所有邮政编码的所有归因within_5_km，within_10_km，within_25_km，within_50_km，within_100_km？

$(document).ready(function() {

    $.getJSON("post.json", function(data) {

    var pc = data.postalcodes;
    for (var id in pc) {
       if(pc.hasOwnProperty(id)) {
          for(var attr in pc[id]) {
             if(pc[id].hasOwnProperty(attr) && attr.indexOf('within_') === 0) {
               delete pc[id][attr];
             }
          }
       }
    }

    $("#json").html(pc);

    });

});

Answer 1

转到您提供的json url并打开Firebug控制台。然后放入以下代码并执行它：

var p = document.getElementsByTagName('pre');
for(i=0; i < p.length; i++) {

  var data = JSON.parse(p[i].innerHTML);
  var pc = data.postalcodes;

  // this is the code i gave you... the previous is jsut to pull it out of the page
  // in Firebug - this works for me

  for (var id in pc) {
     if(pc.hasOwnProperty(id)) {
        for(var attr in pc[id]) {
          if(pc[id].hasOwnProperty(attr) && attr.indexOf('within_') === 0) {
             console.log('Deleting postalcodes.'+id+'.'+attr);
             delete pc[id][attr];
           }
        }
     }
  }
}

// assume data is the complete json

var pc = data.postalcodes;
for (var id in pc) {
   if(pc.hasOwnProperty(id)) {
      for(var attr in pc[id]) {
         if(pc[id].hasOwnProperty(attr) && attr.indexOf('within_') === 0) {
           delete pc[id][attr];
         }
      }
   }
}

Answer 2

在ES2016中，您可以使用destructing为子集对象选择所需的字段。

//ES6 subset of an object by specific fields
var object_private = {name: "alex", age: 25, password: 123};
var {name,age} = object_private, object_public = {name,age}


//method 2 using literals
let object_public = (({name,age})=>({name,age}))(object_private);


//use map if array of objects
    users_array.map(u=>u.id)

Answer 3

JSON截断：

var data = {"postalcodes":
{"800":{"id":"800","name":"H\u00f8je Taastrup","region_ids":["1084"],"region_names":["Hovedstaden"],"commune_ids":["169"],"commune_names":["H\u00f8je-Taastrup"],"lat":"55.66713","lng":"12.27888", "within_5_km":["800","2620","2630","2633"],"within_10_km":["800","2600","2605","2620"]},
"900":{"id":"900","name":"K\u00f8benhavn C","region_ids":["1084"],"region_names":["Hovedstaden"],"commune_ids":["101"],"commune_names":["K\u00f8benhavns"],"lat":"55.68258093401054","lng":"12.603657245635986","within_5_km":["900","999"]},
"1417":{"commune_id":"390","region_id":"1085"}}};
var pc = data.postalcodes;
for (var id in pc) {
    var entry = pc[id];
    for(var attr in entry) {
        if(attr.indexOf('within_') === 0) {
            delete entry[attr];
        }
    }
}
console.dir(data); // your data object has been augmented at this point

您也可以使用正则表达式

var data = {"postalcodes":
{"800":{"id":"800","name":"H\u00f8je Taastrup","region_ids":["1084"],"region_names":["Hovedstaden"],"commune_ids":["169"],"commune_names":["H\u00f8je-Taastrup"],"lat":"55.66713","lng":"12.27888", "within_5_km":["800","2620","2630","2633"],"within_10_km":["800","2600","2605","2620"]},
"900":{"id":"900","name":"K\u00f8benhavn C","region_ids":["1084"],"region_names":["Hovedstaden"],"commune_ids":["101"],"commune_names":["K\u00f8benhavns"],"lat":"55.68258093401054","lng":"12.603657245635986","within_5_km":["900","999"]},
"1417":{"commune_id":"390","region_id":"1085"}}};
var regexp = new RegExp("^within_", "i");   // case insensitive regex matching strings starting with within_
var pc = data.postalcodes;
for (var id in pc) {
    var entry = pc[id];
    for(var attr in entry) {
        if(regexp.test(attr)) {
            delete entry[attr];
        }
    }
}
console.dir(data);

Answer 4

我已经编写了一个npm模块unset，它正是这样做的。您指定类似于json-path模块的json路径，直到您要删除的叶属性。

INFO: I/O exception (java.net.NoRouteToHostException) caught when processing request to {}->http://myserver:80: No route to host (Host unreachable)

第二个参数

支持多个路径

Answer 5

你可以做到这一点：

var postalcodes = YOUR JSON;

for(var code in postalcodes)
{
 delete postalcodes[code].within_5_km;
 .
 .
 .
}

您可能想要检查代码是否包含您的属性...

如何删除嵌套属性？

5 个答案: