淺談JavaScript對象數組根據某屬性sort升降序排序

一、自定義一個比較器，其參數爲待排序的屬性。

二、將帶參數的比較器傳入sort()。

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var data = [
	{name: "Bruce", age: 23, id: 16, score: 80},
	{name: "Alice", age: 24, id: 12, score: 90},
	{name: "David", age: 21, id: 11, score: 70},
	{name: "Cindy", age: 22, id: 10, score: 100},
];
data.sort(compareUp("age"));
data.sort(compareDown("age"));
function compareUp(propertyName) { // 升序排序
    if ((typeof data[0][propertyName]) != "number") { // 屬性值爲非數字
		return function(object1, object2) {
			var value1 = object1[propertyName];
			var value2 = object2[propertyName];
			return value1.localeCompare(value2);
		}
	}
	else {
		return function(object1, object2) { // 屬性值爲數字
			var value1 = object1[propertyName];
			var value2 = object2[propertyName];
			return value1 - value2;
		}
	}
}
function compareDown(propertyName) { // 降序排序
    if ((typeof data[0][propertyName]) != "number") { // 屬性值爲非數字
		return function(object1, object2) {
			var value1 = object1[propertyName];
			var value2 = object2[propertyName];
			return value2.localeCompare(value1);
		}
	}
	else {
		return function(object1, object2) { // 屬性值爲數字
			var value1 = object1[propertyName];
			var value2 = object2[propertyName];
			return value2 - value1;
		}
	}
}

​