[freee]

var arNames = [
        "value1",
        "value3",
        "value3",
        "value1",
        "value1",
        "value6",
        "value6"
        ];
 
var result = arNames.reduce(function(map, item) {
    map[item] = (map[item] || 0) + 1;
    return map;
}, Object.create(null));

s=""
for (i in result) s+="<span>"+i+"</span>\t-\t"+"<span>"+result[i]+"</span>\n"

alert(s)


//  <span>value1</span>	-	<span>3</span>
//  <span>value3</span>	-	<span>2</span>
//  <span>value6</span>	-	<span>2</span>