按3個值對JavaScript數組進行排序

-1

我想按三個值排序此JavaScript數組，但我似乎無法弄清楚如何一次對多個屬性進行排序。按3個值對JavaScript數組進行排序

的要求是：

featured項目應該是在最高層
然後項目進行沒有名（null）
然後用姓名的項目是不featured
按createdAt降序排序（從最新的優先排序）

這是數組：

var items [ 
    { name: 'foo-1', featured: true, createdAt: 1493000001 }, 
    { name: null, featured: false, createdAt: 1493000003 }, 
    { name: 'foo-3', featured: true, createdAt: 1493000002 }, 
    { name: 'foo-4', featured: false, createdAt: 1493000004 }, 
    { name: 'foo-5', featured: false, createdAt: 1493000005 }, 
];

結果應該是：

[ 
    { name: 'foo-3', featured: true, createdAt: 1493000002 }, 
    { name: 'foo-1', featured: true, createdAt: 1493000001 }, 
    { name: null, featured: false, createdAt: 1493000003 }, 
    { name: 'foo-5', featured: false, createdAt: 1493000005 }, 
    { name: 'foo-4', featured: false, createdAt: 1493000004 }, 
]

來源

2017-04-26 Till

已經回答[如何排序多個字段對象數組？]（HTTP的=> http://stackoverflow.com/a/4760279/1315419 – Vasan

可能重複：/ /stackoverflow.com/questions/6913512/how-to-sort-an-array-of-objects-by-multiple-fields） –

@Vasan是的，這個答案真的很好 - http://stackoverflow.com/a/ 4760279/2957677 –

var items = [ 
 
    { name: 'foo-1', featured: true, createdAt: 1493000001 }, 
 
    { name: null, featured: false, createdAt: 1493000003 }, 
 
    { name: 'foo-3', featured: true, createdAt: 1493000002 }, 
 
    { name: 'foo-4', featured: false, createdAt: 1493000004 }, 
 
    { name: 'foo-5', featured: false, createdAt: 1493000005 }, 
 
]; 
 

 
items.sort(function(a, b) { 
 
    if(a.featured && !b.featured) return -1; // if a is featured and b is not, then put a above b 
 
    if(!a.featured && b.featured) return 1; // if b is featured and a is not, then put b above a 
 
    
 
    if(!a.name && b.name) return -1;   // if a doesn't have a name and b does, then put a above b 
 
    if(a.name && !b.name) return 1;   // if b doesn't have a name and a does, then put b above a 
 
    
 
    return b.createdAt - a.createdAt;  // otherwise (a and b have simillar properties), then sort by createdAt descendently 
 
}); 
 

 
console.log(items);

來源

2017-04-26 22:42:24

你可以使用一個比較，可以作爲參數傳遞給sort（）函數傳遞功能 - 有關更多詳細信息，請參閱Array.prototype.sort()。你的情況比較函數可能看起來像這樣：

var items = [ 
    { name: 'foo-1', featured: true, createdAt: 1493000001 }, 
    { name: null, featured: false, createdAt: 1493000003 }, 
    { name: 'foo-3', featured: true, createdAt: 1493000002 }, 
    { name: 'foo-4', featured: false, createdAt: 1493000004 }, 
    { name: 'foo-5', featured: false, createdAt: 1493000005 }, 
]; 

function compare(a, b) { 
    if (a.featured === true && b.featured === false) return -1; 
    if (a.featured === false && b.featured === true) return 1; 
    if (a.name === null && b.featured !== null) return -1; 
    if (a.name !== null && b.name === null) return 1; 

    return b.createdAt - a.createdAt; 
}; 

items.sort(compare);

應該覆蓋情況下，當名是一個空字符串。

來源

2017-04-26 22:37:15

按3個值對JavaScript數組進行排序

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