数组demo

 1 <!DOCTYPE html>
 2 <html>
 3 <head lang="en">
 4     <meta charset="UTF-8">
 5     <title></title>
 6 </head>
 7 <body>
 8 <script>
 9 
10     var arr2 = [7,6,15,4,13,2,1];
11 
12     var aaa = sort(arr2, function (a,b) {
13         return b-a;
14     });
15 
16     console.log(aaa);
17 
18     function sort(arr,fn){
19         for(var i=0;i<arr.length-1;i++){
20             for(var j=0;j<arr.length-1;j++){
21                 if(fn(arr[j],arr[+j1])>0){
22                     var temp = arr[j];
23                     arr[j] = arr[j+1];
24                     arr[j+1] = temp;
25                 }
26             }
27         }
28         return arr;
29     }
30 
31 
32 
33 </script>
34 </body>
35 </html>