JavaScript數組過濾相同元素

var arr = [1,2,2,4,3,6,7,6,8,5,5,5];
function delSameElement(arr){
    var newArr = [];
    for(var i = 0;i< arr.length;i++){
        mark = 0;
        for(var j=0;j<newArr.length;j++){
            if(arr[i]==newArr[j]){
                mark = 1;
                break;
            }else{
                continue;
            }
        }
        if(!mark){
            newArr.push(arr[i]);
        }
    }
    return newArr;
arr = delSameElement(arr);
document.write(arr.join('-'));