排序一组JavaScript对象
我使用Ajax读取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"
}
];
如何创建一个函数来按price属性按升序或降序排序对象，只使用JavaScript？
按照价格从小到大排序：
homes.sort(function(a, b) {
return parseFloat(a.price) - parseFloat(b.price);
});
或者在ES6版本之后：
homes.sort((a, b) => parseFloat(a.price) - parseFloat(b.price));
有些文档可以在这里找到。
这是一个更灵活的版本，它允许您创建可重用的排序功能，并按任何字段进行排序。
var sort_by = function(field, reverse, primer){
var key = primer ?
function(x) {return primer(x[field])} :
function(x) {return x[field]};
reverse = !reverse ? 1 : -1;
return function (a, b) {
return a = key(a), b = key(b), reverse * ((a > b) - (b > a));
}
}
现在你可以按任意字段排序......
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"
}];
// Sort by price high to low
homes.sort(sort_by('price', true, parseInt));
// Sort by city, case-insensitive, A-Z
homes.sort(sort_by('city', false, function(a){return a.toUpperCase()}));
要对其进行排序，您需要创建一个带有两个参数的比较函数。 然后使用该比较函数调用排序函数，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);
如果要按升序切换减号每一侧的表达式。
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