如果我有一个JavaScript对象，如:
var list = {
"you": 100,
"me": 75,
"foo": 116,
"bar": 15
};
是否有一种方法可以根据值对属性进行排序?最后得到
list = {
"bar": 15,
"me": 75,
"you": 100,
"foo": 116
};
当前回答
let toSort = {a:2323, b: 14, c: 799}
let sorted = Object.entries(toSort ).sort((a,b)=> a[1]-b[1])
输出:
[ [ "b", 14 ], [ "c", 799 ], [ "a", 2323 ] ]
其他回答
你的对象可以有任意数量的属性，如果你把对象放在数组中，你可以选择根据你想要的任何对象属性进行排序，数字或字符串。考虑这个数组:
var arrayOfObjects = [
{
name: 'Diana',
born: 1373925600000, // Mon, Jul 15 2013
num: 4,
sex: 'female'
},
{
name: 'Beyonce',
born: 1366832953000, // Wed, Apr 24 2013
num: 2,
sex: 'female'
},
{
name: 'Albert',
born: 1370288700000, // Mon, Jun 3 2013
num: 3,
sex: 'male'
},
{
name: 'Doris',
born: 1354412087000, // Sat, Dec 1 2012
num: 1,
sex: 'female'
}
];
按出生日期排序，最年长的先
// use slice() to copy the array and not just make a reference
var byDate = arrayOfObjects.slice(0);
byDate.sort(function(a,b) {
return a.born - b.born;
});
console.log('by date:');
console.log(byDate);
按名称排序
var byName = arrayOfObjects.slice(0);
byName.sort(function(a,b) {
var x = a.name.toLowerCase();
var y = b.name.toLowerCase();
return x < y ? -1 : x > y ? 1 : 0;
});
console.log('by name:');
console.log(byName);
http://jsfiddle.net/xsM5s/16/
let toSort = {a:2323, b: 14, c: 799}
let sorted = Object.entries(toSort ).sort((a,b)=> a[1]-b[1])
输出:
[ [ "b", 14 ], [ "c", 799 ], [ "a", 2323 ] ]
我用sort的解决方案:
let list = {
"you": 100,
"me": 75,
"foo": 116,
"bar": 15
};
let sorted = Object.entries(list).sort((a,b) => a[1] - b[1]);
for(let element of sorted) {
console.log(element[0]+ ": " + element[1]);
}
我遵循slebetman给出的解决方案(去阅读它的所有细节)，但调整，因为你的对象是非嵌套的。
// First create the array of keys/values so that we can sort it:
var sort_array = [];
for (var key in list) {
sort_array.push({key:key,value:list[key]});
}
// Now sort it:
sort_array.sort(function(x,y){return x.value - y.value});
// Now process that object with it:
for (var i=0;i<sort_array.length;i++) {
var item = list[sort_array[i].key];
// now do stuff with each item
}
感谢@orad在TypeScript中提供了答案。现在，我们可以在JavaScript中使用下面的代码片断。
function sort(obj,valSelector) { const sortedEntries = Object.entries(obj) .sort((a, b) => valSelector(a[1]) > valSelector(b[1]) ? 1 : valSelector(a[1]) < valSelector(b[1]) ? -1 : 0); return new Map(sortedEntries); } const Countries = { "AD": { "name": "Andorra", }, "AE": { "name": "United Arab Emirates", }, "IN": { "name": "India", }} // Sort the object inside object. var sortedMap = sort(Countries, val => val.name); // Convert to object. var sortedObj = {}; sortedMap.forEach((v,k) => { sortedObj[k] = v }); console.log(sortedObj); //Output: {"AD": {"name": "Andorra"},"IN": {"name": "India"},"AE": {"name": "United Arab Emirates"}}
