JS Array to weight comparison

An array to repeat is a common requirement, and we temporarily consider the same type of array to repeat. The main reason is to clear the thinking and consider performance.
The For loop deletes the following duplicate

var uniquefor = function (arr) {
for (var i = 0; i < arr.length-1; i++) {
var item = Arr[i];
for (var j = i+1 J < Arr.length; J + +) {
item = = = Arr[j] && (Arr.splice (J, 1), j--);
}
};
return arr;
};

Determining Object Properties

var uniqueobject = function (arr) {
var V, r = [], o = {};
for (var i = 0; (v = arr[i])!== undefined; i++) {
!O[V] && (R.push (v), o[v] = true);
}
return R;
};

Array Filter Duplicates Filter

var uniquefilter = function (arr) {
Return Arr.filter (Function (Elem, POS, self) {
Returns true if there are no duplicates
Return Self.indexof (Elem, pos + 1) = =-1;
});
};

Compare execution efficiency

Figure 1 Chrome browser

Figure 2 Firefox browser