js-array, remove the duplicate

For a fixed known array such as:var arr = [' name ', ' OK ', ' 123 ', ' n ', ' look ', ' 777 ', ' n ', ' 123 ', ' name ', 1,3,5,1, ' OK '];

So the question is, how can we get rid of the duplicate strings or numbers, getting a new array?

Method ①:

function takerepetition_1 (arr) {
var data= {}; //This will traverse the data's arr[i] property because the data is empty for the return undefined
var result = [];
For (Var i=0;i<arr.length;i++) {
if (!json[arr[i]]) {
Json[arr[i]] = 1; //So when if satisfied! Undefined is true when the value of the Arr[i] property of data is set to 1
Result.push (Arr[i]); ///And then put in the result array so if there are duplicate values in the ARR array, the If does not meet the criteria will not be added to the array
}
}
return result;
}
Console.log (Unqiue (arr));

method ②:
Array.prototype.takeRepetition_2 = function () { //two cycles iterating through an array, comparing values
var a = [];
var L = this.length;
For (var i = 0;i< l; i++){ 
For (var j = i + 1; j < L; j + +) {
if (this[i] = = = This[j]) {

j = ++i

}
}
A.push (This[i]);
}
return A;
}
Console.log (Arr.takerepetition_2 ());

Method ③:

array.prototype.takerepetition _3 = function () {

var n = []; //A new temporary array
for (var i = 0; i < this.length; i++) { //If the current array is already saved in the temporary array, skip, otherwise push the current item into the temporary array
if (N.indexof (this[i]) = =-1) n.push (This[i]);
}
return n;
}
Console.log (Arr.takerepetition_3 ());

All right, welcome to a different way to discuss it together! ~~~~~

js-array, remove the duplicate