我有以下数组：
"devices": [
{
"_id": "HP Printer",
"count": 1
},
{
"_id": "55UA8990",
"count": 1
},
{
"_id": "Mac OS X 10.5",
"count": 1
},
{
"_id": "Nokia",
"count": 4
},
{
"_id": "Ubuntu Linux",
"count": 3
},
{
"_id": "LG handset",
"count": 1
},
{
"_id": "Samsung Home Audio/Video equipment",
"count": 1
},
{
"_id": "Generic Linux",
"count": 1
},
{
"_id": "Sony handset",
"count": 1
},
{
"_id": "Mac OS X 10.8",
"count": 12
},
{
"_id": "Linux Handheld",
"count": 1
},
{
"_id": "Symbian OS",
"count": 15
},
{
"_id": "RIM BlackBerry",
"count": 28
},
{
"_id": "Apple iPod",
"count": 1
},
{
"_id": "LG BL40",
"count": 1
},
{
"_id": "Slingbox",
"count": 67
},
{
"_id": "Windows XP",
"count": 60
},
{
"_id": "BlackBerry",
"count": 51
},
{
"_id": "Chrome OS",
"count": 7
},
{
"_id": "Eye-Fi Wireless Memory Card",
"count": 6
},
{
"_id": "Mac OS X 10.9",
"count": 62
},
{
"_id": "Mac OS X 10.10",
"count": 215
},
{
"_id": "Windows Vista",
"count": 4
},
{
"_id": "Windows Mobile OS",
"count": 213
},
{
"_id": "Windows 7/Vista",
"count": 394
},
{
"_id": "Mac OS X 10.11",
"count": 303
},
{
"_id": "Samsung TV",
"count": 1
},
{
"_id": "PlayStation Portable",
"count": 1
},
{
"_id": "Mac OS X",
"count": 755
},
{
"_id": "Windows 7",
"count": 612
},
{
"_id": "Apple iPad",
"count": 2597
},
{
"_id": "Ellipsis 8",
"count": 193
},
{
"_id": "Mac OS X 10.12",
"count": 550
},
{
"_id": "Nexus",
"count": 4657
},
{
"_id": "Windows 10",
"count": 772
},
{
"_id": "Windows 8",
"count": 1191
},
{
"_id": "Xbox 360",
"count": 39
},
{
"_id": "Mac OS X 10.6",
"count": 5
},
{
"_id": "Apple iPhone",
"count": 41039
},
{
"_id": "iOS",
"count": 25725
},
{
"_id": "Debian-based Linux",
"count": 9
},
{
"_id": null,
"count": 5291
},
{
"_id": "Mac OS X 10.7",
"count": 16
},
{
"_id": "Belkin Wireless Router",
"count": 1
},
{
"_id": "Windows",
"count": 1002
},
{
"_id": "Android",
"count": 51314
}
]
我正在尝试将_id对应同一个操作系统的所有值分组，并从每个元素添加count，所以我可以得到类似的内容：
[
{
"label": "Windows",
"value": "9999"
},
{
"label": "Android",
"value": "8888"
},
{
"label": "iOS",
"value": "7777"
},
{
"label": "Macos",
"value": "10000"
},
{
"label": "Other",
"value": "5000"
}
]
我完全迷失在这里，我真的很感激一些帮助和指导。
答案 0 :(得分：1)
为您的方案使用了Array.prototype.reduce和String.prototype.match。希望这会有所帮助。
var input = {"devices":[{"_id":"HP Printer","count":1},{"_id":"55UA8990","count":1},{"_id":"Mac OS X 10.5","count":1},{"_id":"Nokia","count":4},{"_id":"Ubuntu Linux","count":3},{"_id":"LG handset","count":1},{"_id":"Samsung Home Audio/Video equipment","count":1},{"_id":"Generic Linux","count":1},{"_id":"Sony handset","count":1},{"_id":"Mac OS X 10.8","count":12},{"_id":"Linux Handheld","count":1},{"_id":"Symbian OS","count":15},{"_id":"RIM BlackBerry","count":28},{"_id":"Apple iPod","count":1},{"_id":"LG BL40","count":1},{"_id":"Slingbox","count":67},{"_id":"Windows XP","count":60},{"_id":"BlackBerry","count":51},{"_id":"Chrome OS","count":7},{"_id":"Eye-Fi Wireless Memory Card","count":6},{"_id":"Mac OS X 10.9","count":62},{"_id":"Mac OS X 10.10","count":215},{"_id":"Windows Vista","count":4},{"_id":"Windows Mobile OS","count":213},{"_id":"Windows 7/Vista","count":394},{"_id":"Mac OS X 10.11","count":303},{"_id":"Samsung TV","count":1},{"_id":"PlayStation Portable","count":1},{"_id":"Mac OS X","count":755},{"_id":"Windows 7","count":612},{"_id":"Apple iPad","count":2597},{"_id":"Ellipsis 8","count":193},{"_id":"Mac OS X 10.12","count":550},{"_id":"Nexus","count":4657},{"_id":"Windows 10","count":772},{"_id":"Windows 8","count":1191},{"_id":"Xbox 360","count":39},{"_id":"Mac OS X 10.6","count":5},{"_id":"Apple iPhone","count":41039},{"_id":"iOS","count":25725},{"_id":"Debian-based Linux","count":9},{"_id":null,"count":5291},{"_id":"Mac OS X 10.7","count":16},{"_id":"Belkin Wireless Router","count":1},{"_id":"Windows","count":1002},{"_id":"Android","count":51314}]};
var output = input.devices.reduce(function(a, b) {
var match = b._id?b._id.match(/(Mac|Windows|Android|iOS)/):null;
match = match ? match[0] : 'Others';
a[match] = (a[match] || 0) + b.count;
return a;
}, {});
output = Object.keys(output).map(function(k){
return {
label: k,
value: output[k]
};
});
console.log(output);
答案 1 :(得分：0)
.*windows.*。_id与正则表达式匹配。value。如果不匹配，请添加到＆＃34;其他＆＃34;。你是如何做的取决于你，这只是一个普遍的想法。
答案 2 :(得分：0)
您可以执行以下操作：
var results = [];
devices.forEach(function(d) {
if(results.length === 0){ //shortcut for the first element
results.push({label:d._id, value: d.count});
} else {
var found = false;
for(var j =0; j < results.length; j++){
var i = results[j];
if(i.label === d._id){
found = true;
i.value += d.count;
results[j] = i;
}
});
if(!found) {
results.push({label:d._id, value: d.count});
}
}
});
return results;
这将迭代设备数组并找到匹配的数组中的元素，并将计数添加到结果数组中该项的值。如果找不到该项，或者它是第一项，则会将新对象推送到结果数组。
答案 3 :(得分：0)
您可以将数组与分组字符串一起使用，并使用哈希表进行计数。
var data = { devices: [{ _id: "HP Printer", count: 1 }, { _id: "55UA8990", count: 1 }, { _id: "Mac OS X 10.5", count: 1 }, { _id: "Nokia", count: 4 }, { _id: "Ubuntu Linux", count: 3 }, { _id: "LG handset", count: 1 }, { _id: "Samsung Home Audio/Video equipment", count: 1 }, { _id: "Generic Linux", count: 1 }, { _id: "Sony handset", count: 1 }, { _id: "Mac OS X 10.8", count: 12 }, { _id: "Linux Handheld", count: 1 }, { _id: "Symbian OS", count: 15 }, { _id: "RIM BlackBerry", count: 28 }, { _id: "Apple iPod", count: 1 }, { _id: "LG BL40", count: 1 }, { _id: "Slingbox", count: 67 }, { _id: "Windows XP", count: 60 }, { _id: "BlackBerry", count: 51 }, { _id: "Chrome OS", count: 7 }, { _id: "Eye-Fi Wireless Memory Card", count: 6 }, { _id: "Mac OS X 10.9", count: 62 }, { _id: "Mac OS X 10.10", count: 215 }, { _id: "Windows Vista", count: 4 }, { _id: "Windows Mobile OS", count: 213 }, { _id: "Windows 7/Vista", count: 394 }, { _id: "Mac OS X 10.11", count: 303 }, { _id: "Samsung TV", count: 1 }, { _id: "PlayStation Portable", count: 1 }, { _id: "Mac OS X", count: 755 }, { _id: "Windows 7", count: 612 }, { _id: "Apple iPad", count: 2597 }, { _id: "Ellipsis 8", count: 193 }, { _id: "Mac OS X 10.12", count: 550 }, { _id: "Nexus", count: 4657 }, { _id: "Windows 10", count: 772 }, { _id: "Windows 8", count: 1191 }, { _id: "Xbox 360", count: 39 }, { _id: "Mac OS X 10.6", count: 5 }, { _id: "Apple iPhone", count: 41039 }, { _id: "iOS", count: 25725 }, { _id: "Debian-based Linux", count: 9 }, { _id: null, count: 5291 }, { _id: "Mac OS X 10.7", count: 16 }, { _id: "Belkin Wireless Router", count: 1 }, { _id: "Windows", count: 1002 }, { _id: "Android", count: 51314 }] },
os = ["Windows", "Android", "iOS", "Mac OS", "Other"],
result = data.devices.reduce(function (hash) {
return function (r, a) {
var key = 'Other';
os.some(function (o) {
if (typeof a._id === 'string' && a._id.toLowerCase().indexOf(o.toLowerCase()) !== -1) {
key = o;
return true;
}
});
if (!hash[key]) {
hash[key] = { label: key, value: 0 };
r.push(hash[key]);
}
hash[key].value += a.count;
return r;
};
}(Object.create(null)), []);
console.log(result);.as-console-wrapper { max-height: 100% !important; top: 0; }