原生JS去除并计算重复数组的个数

//去掉重复的数组并计算每个字符出现的个数；

var arr = ['a','s','d','g','j','d','a','a','d','d','d','v','g','t','e','w','w','d'];//随便列举字符数组

var obj = { },n = [ ];

for(var i in arr){

!obj[ arr[i] ] ? (obj[ arr[i] ]=1) : (obj[ arr[i] ]++);

};

for(var j in obj){

n.push(j);

console.log('字符'+j+'出现次数:'+obj[j]);

};

console.log('去重数组为:'+n);