Sort()函数的多种用法

var values = ["orange","apple","banana"];
values.sort();
console.log(values);//结果["apple", "banana", "orange"]

var values = [,,,,];
values.sort();
console.log(values);//结果[, , , , ]

function compare(a, b){
return (a - b);
}//按升序排列的比较函数
var values = [,,,,];
values.sort(compare);
console.log(values);//结果[, , , , ]

function createComparisonFunction(propertyName){
return function(object, object){
var a = object[propertyName];
var b = object[propertyName];
if(a < b){
return -;
}else if(a > b){
return ;
}else{
return ;
}
}
}//返回一个根据属性名创建的按升序排列的比较函数

var data = [{name:"Lily", age: }, {name:"Judy", age: }];
data.sort(createComparisonFunction("name"));
console.log(data[].name);//Judy
data.sort(createComparisonFunction("age"));
console.log(data[].name);//Lily