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?
你需要两个功能
function desc(a, b) {
return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
}
function asc(a, b) {
return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
}
然后可以将其应用于任何对象属性:
data.sort((a, b) => desc(parseFloat(a.price), parseFloat(b.price)));
让数据=[{label:“一”,值:10},{label:“two”,值:5},{label:“three”,值:1},];//排序函数函数desc(a,b){返回b<a-1:b>a?1:b>=a?0:NaN;}函数asc(a,b){返回a<b-1:a>b?1:a>=b?0:NaN;}//描述(DESC)data.sort((a,b)=>desc(a.value,b.value));document.body.insert相邻HTML('之前','<strong>DESC排序</strong><pre>'+JSON.stringify(数据)+'</pre>');//美国科学院data.sort((a,b)=>asc(a.value,b.value));document.body.insert相邻HTML('之前','<strong>ASCending sorted</strong><pre>'+JSON.stringify(数据)+'</pre>');
更像LINQ的解决方案:
Array.prototype.orderBy = function (selector, desc = false) {
return [...this].sort((a, b) => {
a = selector(a);
b = selector(b);
if (a == b) return 0;
return (desc ? a > b : a < b) ? -1 : 1;
});
}
优势:
财产的自动补全扩展阵列原型不更改数组易于在方法链中使用
用法:
Array.prototype.orderBy=函数(选择器,desc=false){return[…this].sort((a,b)=>{a=选择器(a);b=选择器(b);如果(a==b)返回0;返回(desc?a>b:a<b)-1 : 1;});};var家=[{“h_id”:“3”,“城市”:“达拉斯”,“状态”:“TX”,“zip”:“75201”,“价格”:“162500”}, {“h_id”:“4”,“城市”:“贝弗利山”,“状态”:“CA”,“zip”:“90210”,“price”:“319250”}, {“h_id”:“5”,“城市”:“纽约”,“州”:“NY”,“zip”:“00010”,“价格”:“962500”}];let sorted_homes=homes.orderBy(h=>parseFloat(h.price));console.log(“按价格排序”,sorted_homes);let sorted_homes_desc=homes.orderBy(h=>h.city,true);console.log(“按城市降序排序”,sorted_home_desc);
我最近编写了一个通用函数,如果您想使用它,可以为您管理它。
/**
* Sorts an object into an order
*
* @require jQuery
*
* @param object Our JSON object to sort
* @param type Only alphabetical at the moment
* @param identifier The array or object key to sort by
* @param order Ascending or Descending
*
* @returns Array
*/
function sortItems(object, type, identifier, order){
var returnedArray = [];
var emptiesArray = []; // An array for all of our empty cans
// Convert the given object to an array
$.each(object, function(key, object){
// Store all of our empty cans in their own array
// Store all other objects in our returned array
object[identifier] == null ? emptiesArray.push(object) : returnedArray.push(object);
});
// Sort the array based on the type given
switch(type){
case 'alphabetical':
returnedArray.sort(function(a, b){
return(a[identifier] == b[identifier]) ? 0 : (
// Sort ascending or descending based on order given
order == 'asc' ? a[identifier] > b[identifier] : a[identifier] < b[identifier]
) ? 1 : -1;
});
break;
default:
}
// Return our sorted array along with the empties at the bottom depending on sort order
return order == 'asc' ? returnedArray.concat(emptiesArray) : emptiesArray.concat(returnedArray);
}