数组重复计数，对象方法

var str = "assssddiffdsfs";

var cc = new Object;
function repeatNum(str){
for(var i = 0;i < str.length;i++){
if(!cc[str[i]]){
cc[str[i]] = 1;
}else{
cc[str[i]]++;
}
}
}
repeatNum(str);

console.log(cc);