Question

如何在json中获取重复对象的值，例如：

{ TableName: 'Table_0',
  Rows:
   [ [ 277, '2017-08-22T14:00:00Z' ],
     [ 263, '2017-08-22T15:00:00Z' ],
     [ 265, '2017-08-22T16:00:00Z' ],
     [ 266, '2017-08-22T17:00:00Z' ],
     [ 265, '2017-08-22T18:00:00Z' ],
     [ 264, '2017-08-22T19:00:00Z' ] ] }
{ TableName: 'Table_1',
  Rows: [ [ '{"Visualization":"table","Title":"","Accumulate":false,"IsQuerySorted":false,"Kind":"","Annotation":"","By":null}' ] ] }

我只想要第一个 Rows 对象的值，我该如何实现？

可以找到完整的json here

Answer 1

您可以使用var raster = new ol.layer.Tile({ source: new ol.source.OSM() }); var data = new ol.Collection(); data.push(new ol.Feature({ geometry: new ol.geom.Point([0, 0]) })); var f = new ol.Feature({ geometry: new ol.geom.Point([0, 0]) }); f.setStyle(new ol.style.Style({ image: new ol.style.Circle({ radius: 10, fill: new ol.style.Fill({ color: [255, 255, 255, 0.5] }), zIndex: Infinity }), })); data.push(f); var vector = new ol.layer.Vector({ source: new ol.source.Vector({ features: data }) }); var modify = new ol.interaction.Modify({ features: data }); var map = new ol.Map({ interactions: ol.interaction.defaults().extend([modify]), layers: [raster, vector], target: 'map', view: new ol.View({ center: [0, 0], zoom: 12 }) });获取目标对象（基于Array.find值）：

＆＃13;

TableName

＆＃13;

如果你不支持ES6：

const data = { Tables: 
 [{ TableName: 'Table_0',
    Rows:
   [ [ 277, '2017-08-22T14:00:00Z' ],
     [ 263, '2017-08-22T15:00:00Z' ],
     [ 265, '2017-08-22T16:00:00Z' ],
     [ 266, '2017-08-22T17:00:00Z' ],
     [ 265, '2017-08-22T18:00:00Z' ],
     [ 264, '2017-08-22T19:00:00Z' ] ] },
   { TableName: 'Table_1',
    Rows: [ [ '{"Visualization":"table","Title":"","Accumulate":false,"IsQuerySorted":false,"Kind":"","Annotation":"","By":null}' ] ] }]};

console.log(data.Tables.find(row => row.TableName === 'Table_0').Rows)

如果您知道索引，也可以使用简单数组访问：

var targetObject = data.Tables.find(function(row) { 
   return row.TableName === 'Table_0'
})
console.log(targetObject.Rows)

如何获取JSON中第一个重复对象的值？

1 个答案: