javascript数组排序-----1

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>javascript数组去重算法-----3</title>
 6 </head>
 7 <body>
 8     <script>
 9 var arrDemo = new Array();
10 
11  arrDemo[0] = 10;
12  arrDemo[1] = 50;
13  arrDemo[2] = 51;
14  arrDemo[3] = 100;
15 
16  arrDemo.sort(); //调用sort方法后，数组本身会被改变，即影响原数组
17 
18 console.log(arrDemo);//10,100,50,51 默认情况下sort方法是按ascii字母顺序排序的，而非我们认为是按数字大小排序
19 
20  arrDemo.sort(function(a,b){return a>b?1:-1});//从小到大排序
21 
22 console.log(arrDemo);//10,50,51,100
23 
24  arrDemo.sort(function(a,b){return a<b?1:-1});//从大到小排序
25 
26  console.log(arrDemo);
27     </script>
28 </body>
29 </html>
坚持下去就能成功