Javascript实例 - 统计字符串中出现最多的字符

var str="abcdefgaddbbbba";
var obj={};
for(var i=0;i<str.length;i++){
    var key = str[i];
    if(!obj[key]){obj[key]=1}else{obj[key]++}  //二维数组，统计出现的单个字符的个数
}
var max = -1;max_key = "";
for(var key in obj){
    if(max<obj[key]){max = obj[key];max_key = key;}
}
console.log("max:"+max+"max_key:"+max_key);