每个字符在字符串中出现的次数

function isMaxTime(str)
    {
        var obj={};
        for (var i=0;i<str.length;i++)
        {
            var arr=str[i];
            if (obj[arr])
            {
                obj[arr]++;
            }
            else
            {
                obj[arr]=1;
            }
        }

        for (var arr in obj)
        {
            console.log(arr+"出现了"+obj[arr]+"次");
        }
    }
    console.log(isMaxTime("ahsahsahjhasdjhdjashdhwsjhasjk"));