获取字符串中出现次数最多的字符以及出现次数

gistfile1.js

var maxchar = function(s){  
    var o = {},t = [0,''];  
    for(var i = 0 , l = s.length; i < l ; i++){  
        if(o[s[i]]){  
            o[s[i]] += 1;  
            if(o[s[i]] > t[0]){  
                t[0] = o[s[i]];  
                t[1] = s[i];  
            }  
        }else{  
            o[s[i]] = 1;  
        }  
    }  
    return t;  
}  
console.log(maxchar('abcdefgabcabcefggg'));