1、价格升序，距离降序

  1.  var arr = [{
  2.             name:"肯德基",price:100,distance:100
  3.         },
  4.         {
  5.             name:"必胜客",price:200,distance:500
  6.         },
  7.         {
  8.             name:"华莱士",price:50,distance:1000
  9.         }
  10.     ]

2、join拼接字符

  1. var directs = [
  2.             {name:"吴京",id:1001},
  3.             {name:"章子怡",id:1002},
  4.             {name:"徐峥",id:1003}
  5. ]
  6. /* str =吴京/章子怡/徐峥 */

3、sort排序

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>Document</title>
  8. </head>
  9. <body>
  10.     <select  id="mySelect">
  11.         <option value="price">低价优先</option>
  12.         <option value="distance">距离优先</option>
  13.     </select>
  14.     <script>
  15.          var arr = [{
  16.             name:"肯德基",price:100,distance:100
  17.         },
  18.         {
  19.             name:"必胜客",price:200,distance:1500
  20.         },
  21.         {
  22.             name:"华莱士",price:50,distance:1000
  23.         }
  24.     ]
  25.     var mySelect = document.getElementById("mySelect");
  26.     // console.log(mySelect)
  27.     mySelect.onchange = function(){
  28.         console.log(this.value);
  29.         var value = this.value;
  30.         arr.sort(function(a,b){
  31.             return a[value]-b[value];
  32.         })
  33.         /* 对象的某个属性是变量,不能使用.。只能使用[] */
  34.         console.log(arr);
  35.     }
  36.     </script>
  37. </body>
  38. </html>

4、es6解构-展开-键值相同

  1. <script>
  2.         var arr = [
  3.             {
  4.                 name:"lisi",
  5.                 age:18,
  6.                 likes:["lol","足球"],
  7.                 alikes:["音乐","电影"],
  8.                 sex:"male"
  9.             },
  10.             {
  11.                 name:"王五",
  12.                 age:17,
  13.                 likes:["al","栏球"],
  14.                 alikes:["防抖","放到"],
  15.                 sex:"male"
  16.             },
  17.             {
  18.                 name:"张三",
  19.                 age:165,
  20.                 likes:["发顺丰","jf"],
  21.                 alikes:["音乐9","10电影"],
  22.                 sex:"male"
  23.             }
  24.         ]
  25.         var res = [];
  26.         for(var i=0;i<arr.length;i++){
  27.             /* 解构 */
  28.             var {name,age,likes,alikes} = arr[i];
  29.             /* 展开 */
  30.             likes.push(...alikes);
  31.             /* 键和值相同只用写一个 */
  32.             var obj ={
  33.                 name,
  34.                 age,
  35.                 likes
  36.             }
  37.             res.push(obj);
  38.         }
  39.         console.log(res)
  40.     </script>