vue 根据数组中某一项的值进行排序的方法

<div id="app">
  <ul>
   <li v-for="a in arr1">{{a}}</li>
  </ul>
 </div>
  <script type="text/javascript">
   new Vue({
    el:"#app",
    data:{
     arr:[1,4,5,2,3,44]
    },computed:{
     arr1:function(){
      return this.arr.sort(sortNum)//调用排序方法
     }
    }
   })
   function sortNum(a,b){//排序方法
    return a-b;
   }
  </script>

<div id="app">
   <ul>
    <li v-for="(stu,index) in students1">{{stu}}</li>
   </ul>
  </div>
  <script type="text/javascript">
   new Vue({
    el:"#app",
    data:{
     students:[
      {name:"小a",age:20},
      {name:"小b",age:21},
      {name:"小c",age:18},
      {name:"小d",age:19},
      {name:"小f",age:18}
     ]
    },
    computed:{
     students1:function(){
      return sortKey(this.students,'age')
     }
    }
   })
   function sortKey(array,key){
    return array.sort(function(a,b){
     var x = a[key];
     var y = b[key];
     return ((x<y)?-1:(x>y)?1:0)
    })
   }
  </script>

<table class="recommend_table" cellspacing="0">
 <tr>
  <th>股票</th>
  <th @click="sort('in_price')">入选价</th>
  <th @click="sort('now_price')">最新价</th>
  <th @click="sort('increase')">模拟涨跌幅</th>
 </tr>
 <tr v-for="(item,index) in recommendlist" :key="index">
  <td>
   <div class="recommend_name">{{item.name}}</div>
   <div class="recommend_num">{{item.bn}}</div>
  </td>
  <td>{{item.in_price}}</td>
  <td>{{item.now_price}}</td>
  <td>{{item.increase}}%</td>
 </tr>
</table>

<script type="text/ecmascript-6">
 export default {
  data(){
   return{
    recommendlist: [
     { name:'高科石化', bn:'002778', in_price: 20.68, now_price: 28.68, increase: 10.01 },
     { name:'中孚信息', bn:'300659', in_price: 19.46, now_price: 17.46, increase: 9.06 },
     { name:'永福股份', bn:'300712', in_price: 17.68, now_price: 32.68, increase: 2.01 }
    ],
    sortType: 'in_price'
   }
  },
  methods: {
   sort(type) {
    this.sortType = type;
    this.recommendlist.sort(this.compare(type));
    // switch(type){
     // case 'in_price':
     //  this.sortType = 'in_price';
     //  this.recommendlist.sort(this.compare('in_price'));
     //  break;
     // case 'now_price':
     //  this.sortType = 'now_price';
     //  this.recommendlist.sort(this.compare('now_price'));
     //  break;
     // case 'increase':
     //  this.sortType = 'increase';
     //  this.recommendlist.sort(this.compare('increase'));
     //  break;
    // }
   },
   compare(attr) {
    return function(a,b){
     var val1 = a[attr];
     var val2 = b[attr];
     return val2 - val1;
    }
   }
  }
 }
</script>

compare(key) {
 return function(a,b){
  var val1 = a[key];
  var val2 = b[key];
  return val2 - val1;
 }
}

sort(type) {
 this.sortType = type;
 this.recommendlist.sort(this.compare(type));
 // switch(type){
  // case 'in_price':
  //  this.sortType = 'in_price';
  //  this.recommendlist.sort(this.compare('in_price'));
  //  break;
  // case 'now_price':
  //  this.sortType = 'now_price';
  //  this.recommendlist.sort(this.compare('now_price'));
  //  break;
  // case 'increase':
  //  this.sortType = 'increase';
  //  this.recommendlist.sort(this.compare('increase'));
  //  break;
 // }
}