JavaScript中数组去重的示例分析

这篇文章主要为大家展示了“JavaScript中数组去重的示例分析”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下“JavaScript中数组去重的示例分析”这篇文章吧。

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一、前言：

我们在实际工作中，或者在面试找工作时，都会用到或者被问到一个问题，那就是“数组如何去重”。是的，这个问题有很多种解决方案，看看下面的十种方式吧！

二、数组去重方式大汇总：

Methods 1: 思路：定义一个新数组，并存放原数组的第一个元素，然后将元素组一一和新数组的元素对比，若不同则存放在新数组中。

function unique(arr){
 var res = [arr[0]];
 for(var i=1; i
Methods 2:思路：先将原数组排序，在与相邻的进行比较，如果不同则存入新数组。
function unique2(arr){
 var arr2 = arr.sort();
 var res = [arr2[0]];
 for(var i=1; i
Methods 3: 利用对象属性存在的特性，如果没有该属性则存入新数组。
function unique3(arr){
 var res = [];
 var obj = {};
 for(var i=0; i
Methods 4:利用数组的indexOf下标属性来查询。
function unique4(arr){
 var res = [];
 for(var i=0; i
Methods 5: 利用数组原型对象上的includes方法。
function unique5(arr){
 var res = [];
 
 for(var i=0; i
Methods 6: 利用数组原型对象上的 filter 和 includes方法。
function unique6(arr){
 var res = [];
 
 res = arr.filter(function(item){
  return res.includes(item) ? '' : res.push(item);
 });
 return res;
}

console.log('------------方法六---------------');

console.log(unique6([1,1,2,3,5,3,1,5,6,7,4]));
Methods 7: 利用数组原型对象上的 forEach 和 includes方法。
function unique7(arr){
 var res = [];
 
 arr.forEach(function(item){
  res.includes(item) ? '' : res.push(item);
 }); 
 return res;
}

console.log('------------方法七---------------');

console.log(unique7([1,1,2,3,5,3,1,5,6,7,4]));
Methods 8: 利用数组原型对象上的 splice 方法。
function unique8(arr){
 var i,
  j,
  len = arr.length; 
 for(i = 0; i < len; i++){
  for(j = i + 1; j < len; j++){
   if(arr[i] == arr[j]){
    arr.splice(j,1);
    len--;
    j--;
   }
  }
 }
 return arr;
}

console.log('------------方法八---------------');

console.log(unique8([1,1,2,3,5,3,1,5,6,7,4]));
Methods 9: 利用数组原型对象上的 lastIndexOf 方法。
function unique9(arr){
 var res = []; 
 for(var i=0; i
Methods 10: 利用 ES6的set 方法。
function unique10(arr){
 //Set数据结构，它类似于数组，其成员的值都是唯一的
 return Array.from(new Set(arr)); // 利用Array.from将Set结构转换成数组
}

console.log('------------方法十---------------');

console.log(unique10([1,1,2,3,5,3,1,5,6,7,4]));
 三、其他：
有意思的是，当我把数组的长度变得很大的时候（如下所示），测试了一下不同方法的执行时间长短，会发现方法三、四、五、六、七相对来说会更有优势，而方法八的执行速度似乎一直垫底。你也可以在你本地跑一下试试！
//测试用的超大数组
var arr = 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//这里只是举例方法三（如果你把所有方法放在一起测试，会更直观的看到执行时间的差异）
var time3 = new Date().getTime();
function unique3(arr){
 var res = [];
 var obj = {};
 for(var i=0; i
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