我使用AJAX获取了以下对象，并将它们存储在数组中：
var homes = [
{
"h_id": "3",
"city": "Dallas",
"state": "TX",
"zip": "75201",
"price": "162500"
}, {
"h_id": "4",
"city": "Bevery Hills",
"state": "CA",
"zip": "90210",
"price": "319250"
}, {
"h_id": "5",
"city": "New York",
"state": "NY",
"zip": "00010",
"price": "962500"
}
];
如何创建一个函数，仅使用JavaScript按price属性按升序或降序对对象进行排序？
当前回答
function compareValues(key, order = 'asc') {
return function innerSort(a, b) {
if (!a.hasOwnProperty(key) || !b.hasOwnProperty(key)) {
// property doesn't exist on either object
return 0;
}
const varA = (typeof a[key] === 'string')
? a[key].toUpperCase() : a[key];
const varB = (typeof b[key] === 'string')
? b[key].toUpperCase() : b[key];
let comparison = 0;
if (varA > varB) {
comparison = 1;
} else if (varA < varB) {
comparison = -1;
}
return (
(order === 'desc') ? (comparison * -1) : comparison
);
};
}
http://yazilimsozluk.com/sort-array-in-javascript-by-asc-or-desc
其他回答
仅对于元素值的普通数组：
function sortArrayOfElements(arrayToSort) {
function compareElements(a, b) {
if (a < b)
return -1;
if (a > b)
return 1;
return 0;
}
return arrayToSort.sort(compareElements);
}
e.g. 1:
var array1 = [1,2,545,676,64,2,24]
output : [1, 2, 2, 24, 64, 545, 676]
var array2 = ["v","a",545,676,64,2,"24"]
output: ["a", "v", 2, "24", 64, 545, 676]
对于对象数组：
function sortArrayOfObjects(arrayToSort, key) {
function compareObjects(a, b) {
if (a[key] < b[key])
return -1;
if (a[key] > b[key])
return 1;
return 0;
}
return arrayToSort.sort(compareObjects);
}
e.g. 1: var array1= [{"name": "User4", "value": 4},{"name": "User3", "value": 3},{"name": "User2", "value": 2}]
output : [{"name": "User2", "value": 2},{"name": "User3", "value": 3},{"name": "User4", "value": 4}]
要对其进行排序，需要创建一个接受两个参数的比较器函数。然后用比较器函数调用排序函数，如下所示：
// a and b are object elements of your array
function mycomparator(a,b) {
return parseInt(a.price, 10) - parseInt(b.price, 10);
}
homes.sort(mycomparator);
如果要按升序排序，请切换负号两边的表达式。
如果使用Undercore.js，请尝试sortBy：
// price is of an integer type
_.sortBy(homes, "price");
// price is of a string type
_.sortBy(homes, function(home) {return parseInt(home.price);});
function sortByProperty(home){
return home.price
}
sortByProperty按价格获取属性。将来，您可能希望按“zip”或字符串值“city”对数据进行排序。您需要在上面的函数中更改home.price
// if you want descending order change this to false
// if you are on react.js you could set this with useState
const ascending=true
// Initially "b" is the index-1 item and "a" is the index-0 item
homes.sort((a,b)=>{
//initially 0th index
const first=sortByProperty(a)
// initially 1st index
const second=sortByProperty(b)
// if you multiply by -1 it will be descending
const sortOrder=ascending ? 1 : -1
if (typeof first==="number"){
return (first-second) * sortOrder
} else {
// this will compare the string values
return (first.localeCompare(second)) * sortOrder
}
})
function compareValues(key, order = 'asc') {
return function innerSort(a, b) {
if (!a.hasOwnProperty(key) || !b.hasOwnProperty(key)) {
// property doesn't exist on either object
return 0;
}
const varA = (typeof a[key] === 'string')
? a[key].toUpperCase() : a[key];
const varB = (typeof b[key] === 'string')
? b[key].toUpperCase() : b[key];
let comparison = 0;
if (varA > varB) {
comparison = 1;
} else if (varA < varB) {
comparison = -1;
}
return (
(order === 'desc') ? (comparison * -1) : comparison
);
};
}
http://yazilimsozluk.com/sort-array-in-javascript-by-asc-or-desc
