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我想遍历 react.js 中的一组对象并按条件对其进行排序

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我的 JSON 文件看起来像这样

 {
    "PlanetIdentifier": "KOI-1843.03","Typeflag": 0,"PlanetaryMassJpt": 0.0014,"RadiusJpt": 0.054,"PeriodDays": 0.1768913,"SemiMajorAxisAU": 0.0048,"Eccentricity": "","PeriastronDeg": "","LongitudeDeg": "","DiscoveryYear": 2012,"
  },{
    "PlanetIdentifier": "KOI-1843.01","PlanetaryMassJpt": "","RadiusJpt": 0.114,"PeriodDays": 4.194525,"SemiMajorAxisAU": 0.039,"DiscoveryYear": "",}

现在我的目标是按 year 对对象进行排序，然后使用 RaduisJpt 再次对其进行排序。

if(RaduisJpt > 2) then it is large planet
if(RaDuisJpt <1) then it is a small planet
else it is a medium

然后我必须展示每年有多少小、中和大行星被发现。

MAODAN2536 回答：我想遍历 react.js 中的一组对象并按条件对其进行排序

使用Array#sort：

const arr = [{
    "PlanetIdentifier": "KOI-1843.03","TypeFlag": 0,"PlanetaryMassJpt": 0.0014,"RadiusJpt": 0.054,"PeriodDays": 0.1768913,"SemiMajorAxisAU": 0.0048,"Eccentricity": "","PeriastronDeg": "","LongitudeDeg": "","DiscoveryYear": 2012,},{
    "PlanetIdentifier": "KOI-1843.01","PlanetaryMassJpt": "","RadiusJpt": 0.114,"PeriodDays": 4.194525,"SemiMajorAxisAU": 0.039,"DiscoveryYear": 2010,"RadiusJpt": 0.5,}
]
const sorted = arr.sort((a,b) => {
  let sum = a.DiscoveryYear - b.DiscoveryYear;
  return sum == 0 ? a.RadiusJpt - b.RadiusJpt : sum
})
console.log(sorted);

arraysjavascriptjson
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