Several methods for the _javascript of JavaScript arrays efficiency testing techniques

The following is my online three kinds of efficient methods of summary and efficiency testing, if you have better opinions or suggestions can also be proposed, we encourage learning.

The array goes to the weight Method 1:

Array.prototype.unique1 = function () {
 console.time ("Array to Weight Method 1"); 　　 The time the record starts executing
 var arr = []; 　　Creates a temporary array of
 var obj = {}; Creates an empty object
 for (var i = 0; i < this.length i++) {//traversal of the currently going to heavy array
  if (!obj[this[i]]) {  //To determine if the Obj object contains the current item, not execute 　　
   Arr.push (This[i]); 　　Push current item to temporary array
   obj[this[i] = 1;　　 Save the current item in obj Object
  }
 }
 console.timeend ("Array to Weight Method 1"); The time the record ends execution return
 arr;
}

The array goes to the weight Method 2:

Array.prototype.unique2 = function () {
 console.time ("Array to Weight Method 2");//record time of start execution
 var arr = [];  Creates a temporary array
 for (var i = 0; i < this.length i++) {  //traversal of the currently going to heavy array
  if (Arr.indexof (this[i)) = = 1) {  // Determines whether the current item is present in the temporary array and does not execute
   arr.push (this[i]);///Push the current item to a temporary array
  }
 console.timeend ("Array to redo 2"); The time the record ends execution return
 arr;
}

The array goes to the weight Method 3:

Array.prototype.unique3 = function () {
 console.time ("Array to Weight Method 3");//records Start execution time
 var arr = [This[0]];//create a temporary array, And will go to the first item of the heavy array into the temporary array for
 (var i = 1; i < this.length; i++) {//from going to the heavy array the second entry begins traversing the
  if (This.indexof (this[i)) = = i) {//Judge Pro Whether the current item is present in the array, not executing
   arr.push (this[i]);///Push the current item to the temporary array
  }
 console.timeend ("Array to Redo Method 3"); The time the record ends execution return
 arr;
}

Efficiency test Method:

var arr1 = []; Create an array to go heavy for
(var i = 0; i < 200000 i++) {//Traverse 200,000 data
 Arr1.push (parseint (Math.random () * 10) + 1);// There is data returned as a number of random numbers (between 1-10) and pushed into the array to be
Console.log}

(Arr1.unique1 ());//print array to redo the execution time of the method 1
console.log ( Arr1.unique2 ()); Print array to 2 execution time
Console.log (Arr1.unique3 ());//print array go to Weight Method 3 execution Time

Efficiency test Results:

Summarize

The above is about several kinds of JavaScript array to weight method efficiency test, hope that the results of the test for everyone to choose to use an array to weight method can help, if you have questions you can message exchange. Thank you for your support to the cloud-dwelling community.