数组中每个数组元素出现的次数

<script>
    var obj = [1,4,2,1,3,2,1,4];
    var o = {};


    for (var index in obj){
        if(o.hasOwnProperty(obj[index])){
            var obj1 = obj[index];
            o[obj1] = o[obj1]+1;
        }else{
            var obj1 = obj[index];
            o[obj1] = 1;
        }
    }
    // console.log(o);
    for(k in o){
        console.log(k+"出现了"+o[k]+"次")
    }
</script>