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按年龄对用户排序

重要程度: 5

编写函数 sortByAge(users) 获得对象数组的 age 属性并对它进行排序。

例如:

let john = { name: "John", age: 25 };
let pete = { name: "Pete", age: 30 };
let mary = { name: "Mary", age: 28 };

let arr = [ pete, john, mary ];

sortByAge(arr);

// now: [john, mary, pete]
alert(arr[0].name); // John
alert(arr[1].name); // Mary
alert(arr[2].name); // Pete
function sortByAge(arr) {
  arr.sort((a, b) => a.age > b.age ? 1 : -1);
}

let john = { name: "John", age: 25 };
let pete = { name: "Pete", age: 30 };
let mary = { name: "Mary", age: 28 };

let arr = [ pete, john, mary ];

sortByAge(arr);

// 现在排序是:[john, mary, pete]
alert(arr[0].name); // John
alert(arr[1].name); // Mary
alert(arr[2].name); // Pete