js实现从字符串中查找出现次数最多的字符的两种解决办法

方法一：正则表达式匹配

 

 var str = "adadfdfseffserfefsefseeffffftsdg";
        var maxLength = 0; var result = "";
        while (str != '') {
            oldStr = str;
            getStr = str.charAt(0);
            str = str.replace(new RegExp(getStr, "g"), "");
            if (oldStr.length - str.length > maxLength) {
                maxLength = oldStr.length - str.length;
                result = getStr + "=" + maxLength;
            }
        } 
      alert(result);

方法二：利用数组存储

       var str = "abaacabbabab";
       var tempStr = "";
       var arr = Array;
       arr = [0];
      for (var i = 0; i < str.length - 1; i++) {

                    tempStr = str.charAt(i);

                    if (str.split(tempStr).length > arr[0]) {

                       arr[0] = str.split(tempStr).length - 1; //储存该字符出现次数

                       arr[1] = tempStr; //储存该字符
                    }
                }

      alert(arr);