一个闭包，多传一个参数.

closure.js

function createComparisonFunciton(propertyName) {
	
	return function(object1, object2) {
		var value1 = object1[propertyName];
		var value2 = object2[propertyName];

		if (value1 < value2) {
			return -1;
		} else if (value1 > value2) {
			return 1;
		} else {
			return 0;
		}
	}
}

var data = [{name: "Zachary", age: 28}, {name: "Nicholas", age；29}];

data.sort(createComparisonFunciton("age"));
console.log(data[0].age);

data.sort(createComparisonFunciton("name"));
console.log(data[0].name);