var arr1 =[1,2,2,2,3,3,3,4,5,6],
arr2 = [];
for(var i = 0,len = arr1.length; i< len; i++){
if(arr2.indexOf(arr1[i]) == -1){
arr2.push(arr1[i]);
}
}
console.log(arr2);//[1, 2, 3, 4, 5, 6]
var arr1 =[1,2,2,2,3,3,3,4,5,6],
arr2 = [];
for(var i = 0,len = arr1.length; i< len; i++){
if(arr2.indexOf(arr1[i]) == -1){
arr2.push(arr1[i]);
}
}
console.log(arr2);//[1, 2, 3, 4, 5, 6]