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 = ; var result = "";
         while (str != '') {
             oldStr = str;
             getStr = str.charAt();
             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 = [];
      for (var i = ; i < str.length - ; i++) {

                    tempStr = str.charAt(i);

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

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

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

      alert(arr);