JavaScript数组与对象排序实战：从字典序到自定义规则

var ary = [2, 98, 34, 45, 78, 7, 10, 100, 99];
ary.sort();
console.log(ary);

Array [ 10, 100, 2, 34, 45, 7, 78, 98, 99 ]

var ary = [2, 98, 34, 45, 78, 7, 10, 100, 99];
ary.sort((a, b) => {
 return a-b;
});
console.log(ary);

ary.sort(function(a, b) {
 return b-a;
});
console.log(ary);

ary.sort(function(a, b) {
 return a-b;
});

Array [ 2, 7, 10, 34, 45, 78, 98, 99, 100 ]

Array [ 100, 99, 98, 78, 45, 34, 10, 7, 2 ]

var objArray = [
 {name : 'lily', age : 22},
 {name : 'kandy', age : 20},
 {name : 'lindy', age : 24},
 {name : 'Jone', age : 27}
];

function sortObj(array, key) {
 return array.sort(function(a, b) {
  var x = a[key];
  var y = b[key];
  return x - y;
  //或者 return x > y ? 1 : (x < y ? -1 : 0);
 });
}