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  • javascript中如何去掉数组中的重复项

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    <html lang="en">

    <head>

             <meta charset="UTF-8">

             <title>Document</title>

             <script type="text/javascript">

                       //js对象特性:在js对象中key是永远不会重复的

                       /*

                                1.把数组转成一个js对象

                                2.把数组中的值变成js对象中的key

                                3.把这个对象再次还原成数组

                       */

                       var arr=[2,1,2,10,2,3,5,10,13];

                       // var obj=new Object();

                       // obj.name="xushouwei";

                       // obj.age=30;

                       //把数组变成对象

                       function toObject(arr)

                       {

                                var obj={};

                                for(var i=0;i<arr.length;i++)

                                {

                                         obj[arr[i]]=true;

                                }

                                return obj;

                       }

                       //把对象变成数组

                       function keys(obj)

                       {

                                var arr=[];

                                for(var attr in obj)

                                {

                                         if(obj.hasOwnProperty(attr))

                                         {

                                                   arr.push(attr);

                                         }

                                }

                                return arr;

                       }

                       //综合的方法用于去掉数组中的重复项

                       function uniq(newarr)

                       {

                                return keys(toObject(newarr));

                       }

                       console.log(uniq(arr));

             </script>

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    <body>

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  • 原文地址:https://www.cnblogs.com/Jasxu/p/uniq_array.html
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