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

 1  var str = "adadfdfseffserfefsefseeffffftsdg";
 2         var maxLength = 0; var result = "";
 3         while (str != ‘‘) {
 4             oldStr = str;
 5             getStr = str.charAt(0);
 6             str = str.replace(new RegExp(getStr, "g"), "");
 7             if (oldStr.length - str.length > maxLength) {
 8                 maxLength = oldStr.length - str.length;
 9                 result = getStr + "=" + maxLength;
10             }
11         } 
12       alert(result);

       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);