JS数组去重和取重 

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<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
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    <title>JS数组去重和取重</title>
</head>

<script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script>

<body>
</body>
<script>
    Array.prototype.distinct = function () {
        var a = [], b = [];
        for (var prop in this) {
            var d = this[prop];
            if (d === a[prop]) continue; //防止循环到prototype
            if (b[d] != 1) {
                a.push(d);
                b[d] = 1;
            }
        }
        return a;
    }
    var x = [1,1,2,2,3,4,4,5];
    document.write('原始数组:' + x);
    document.write("<br />");
    document.write('去重复后:' + x.distinct());
    document.write("<br />");
</script>
方法二：取重复数据
<script type="text/javascript">
    Array.prototype.distinct = function () {
        var a = [], b = [], c = [], d = [];
        for (var prop in this) {
            var d = this[prop];
            if (d === a[prop]) {
                continue;
            }//防止循环到prototype
            if (b[d] != 1) {
                a.push(d);
                b[d] = 1;
            }
            else {
                c.push(d);
                d[d] = 1;
            }
        }
//return a;
        return c.distinct1();
    }
    Array.prototype.distinct1 = function () {
        var a = [], b = [];
        for (var prop in this) {
            var d = this[prop];
            if (d === a[prop]) continue; //防止循环到prototype
            if (b[d] != 1) {
                a.push(d);
                b[d] = 1;
            }
        }
        return a;
    }
    var x = [1,1,2,2,3,4,4,5];
    document.write("<br />");
    document.write('原始数组:' + x);
    document.write("<br />");
    document.write('去重复后:' + x.distinct());
</script>
</html>

 

posted @ 2018-09-21 16:46  164537268  阅读(455)  评论(0)    收藏  举报