数组中去掉分割字符串以及去重

//将数组中的带逗号的元素分割，如["A,B,C","A","A,B","C"]变为["A","B","C"]
	var roleA = new Array();
	var roleB = new Array();
	for(var i in roleInfo){
		if(roleInfo[i].indexOf(",")!=-1){
			
		roleB=	roleInfo[i].split(",");
			for(var j in roleB){
				roleA.push(roleB[j]);
			}
		}else{
			roleA.push(roleInfo[i]);
		}
			}
var roleC = first(roleA);
for(var i in roleC){
			$('#remark').append('<label><input name="'+roleC[i]+'"  type="checkbox" />'+roleC[i]+'</label>');
		}
		//去掉数组中重复的数据
var str1=[];
    function first(args){
        for(var i=0;i<args.length;i++){
            if(str1.indexOf(args[i])<0){
                str1.push(args[i])
            }
        }
        return str1;
    }