JS实现给数组对象排序的方法分析

function createComprisonFunction(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;
        }
    }
}
//上面的函数可以像在下面的列子中这样使用
var data = [{name:"Zachary",age:28},{name:"Nicholas",age:29}];
data.sort(createComprisonFunction("name"));
console.log(data[0].name); //Nicholas
data.sort(createComprisonFunction("age"));
console.log(data[0].name); //Zachary