js中.sort()函数的常见用法与高级操作

//没有函数参数，按字符编码格式排序
var arr = [3,2,3,34,12,23,234,84,9];
arr.sort();

// 结果: 12,2,23,234,3,3,34,84,9

// 需要升序或者降序则需要传入一个函数参数
var arr = [3,2,3,34,12,23,234,84,9];
arr.sort(function (a, b) {
    return a - b;
});
// 结果：2,3,3,9,12,23,34,84,234

// 降序
var arr = [3,2,3,34,12,23,234,84,9];
arr.sort(function (a, b) {
    return b - a;
});

// 按age升序排列
var users =[
        { "name": "has",   "age": 17, "height": 165 },
        { "name": "saf",   "age": 20, "height": 172 },
        { "name": "gngh",  "age": 45, "height": 182 },
        { "name": "yjerw", "age": 42, "height": 156 },
        { "name": "cvb",   "age": 22, "height": 176 },
        { "name": "wetty", "age": 32, "height": 178 },
        { "name": "aDNY",  "age": 34, "height": 175 }
     ]
users.sort(function (a, b) {
    return a.age - b.age;
});
// 结果（升序）：
/*
name:has age:17 height:165
name:saf age:20 height:172
name:cvb age:22 height:176
name:wetty age:32 height:178
name:aDNY age:34 height:175
name:yjerw age:42 height:156
name:gngh age:45 height:182
*/

// 按name排列
var users =[
        { "name": "has",   "age": 17, "height": 165 },
        { "name": "saf",   "age": 20, "height": 172 },
        { "name": "gngh",  "age": 45, "height": 182 },
        { "name": "yjerw", "age": 42, "height": 156 },
        { "name": "cvb",   "age": 22, "height": 176 },
        { "name": "wetty", "age": 32, "height": 178 },
        { "name": "aDNY",  "age": 34, "height": 175 }
     ]
var users.sort(function (a, b) {
    return a.name - b.name;
});
// 结果：
/*
name:aDNY age:34 height:175
name:cvb age:22 height:176
name:gngh age:45 height:182
name:has age:17 height:165
name:saf age:20 height:172
name:wetty age:32 height:178
name:yjerw age:42 height:156
*/

// 按布尔值排列
var users=[
        { "name": "has",   "age": 17, "height": 165, "state": true},
        { "name": "saf",   "age": 20, "height": 172, "state": false},
        { "name": "gngh",  "age": 45, "height": 182, "state": false },
        { "name": "yjerw", "age": 42, "height": 156, "state": true },
        { "name": "cvb",   "age": 22, "height": 176, "state": false },
        { "name": "wetty", "age": 32, "height": 178, "state": true },
        { "name": "aDNY",  "age": 34, "height": 175, "state": false }
     ]
users.sort(function (a, b) {
    return b.state- a.state;
});
//众所周知，true - false = 1 
//结果
/*
[
  { name: 'has', age: 17, height: 165, state: true },
  { name: 'yjerw', age: 42, height: 156, state: true },
  { name: 'wetty', age: 32, height: 178, state: true },
  { name: 'saf', age: 20, height: 172, state: false },
  { name: 'gngh', age: 45, height: 182, state: false },
  { name: 'cvb', age: 22, height: 176, state: false },
  { name: 'aDNY', age: 34, height: 175, state: false }
]
*/