编辑代码

var str = "kgklllaklkdd"
var obj = {
    
}
for(var i = 0; i<str.length;i++){
    //console.log(str[i])
    if(obj[str[i]]){
        obj[str[i]] += 1
    }else{
        obj[str[i]] = 1
    }
}

var max = 0;
var maxstr = ''
for(var i in obj){
    //console.log(obj[i])
    if(obj[i] > max){
        max = obj[i]
        maxstr = i
    }
}

console.log(obj,max,maxstr)