直接上代码
var str = "aabcceedddabcqweasdzxc";
var obj = {}
for(var i=0;i<str.length;i++){
if(!obj[str[i]]){
obj[str[i]]=1
}else{
obj[str[i]]++
}
}
console.log(obj);
console.log(Object.keys(obj).join(''));
