javascript数组去重算法-----2

 <!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
     <title>javascript数组去重算法-----2</title>
 </head>
 <body>
     <script>
     var arr = [1,1,2,2,3,2,2,3,3,1,1,4,4,5,6];
     function unique(array){
         var n = [array[0]];
         for (var i = 1; i < array.length; i++) {
             if (array.indexOf(array[i])==i) {
                 n.push(array[i])
             }
         }
         return n
     }
 var cc    =unique(arr);
 console.log(cc)
 //利用indexOf()与第一种的区别
     </script>
 </body>
 </html>