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  • [JavaScript] 获取数组中相同元素的个数

        /**
         * 获取数组中相同元素的个数
         * @param val 相同的元素
         * @param arr 传入数组
         */
        function getSameNum(val,arr){
            processArr = arr.filter(function(value) {
                return value == val;
            })
            return processArr.length;
        }
    // 去除数组中相邻的重复元素
        Array.prototype.distinctCloseTo = function() {
            var $ = this;
            var o3 = new Array();
            var t = 0
            for (var i = 0; i < $.length; i++) {
                if ($[i] != $[i - 1]) {
    
                    o3[t] = $[i];
                    t++;
                }
            }
    
            $.length = 0;
            for (var j = 0; j < o3.length; j++) {
                $[j] = o3[j];
            }
            return o3;
        }
        /**
         * 获取数组中相邻的重复元素的最大个数
         * @param val 指定相邻元素值
         * @param arr 传入数组
         * @returns {number} 相邻的重复元素的最大个数
         */
        function getSiblingMax(val,arr) {
            var t=0;
            var max=0;
            for (var i = 0; i < arr.length; i++) {
                if(arr[i]==val&&arr[i] == arr[i - 1]){
                    t++;
                    if(max<t){
                        max = t;
                    }
                }else{
                    t=0;
                }
            }
            return max+1;
        }
        var a = [2, 3, 3, 4, 4, 4, 4, 5, 6,3, 'a', 'a', 'a', 'b', 'a', 'b', 'c'];
        console.log(getSiblingMax(4,a));//4
        console.log(a.distinctCloseTo());//[2, 3, 4, 5, 6, 3, "a", "b", "a", "b", "c"]
        console.log(getSameNum(1,[1,2,3,1]));//2
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  • 原文地址:https://www.cnblogs.com/frost-yen/p/8616429.html
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