這篇文章主要為大家展示了“JavaScript中數(shù)組去重的示例分析”，內(nèi)容簡而易懂，條理清晰，希望能夠幫助大家解決疑惑，下面讓小編帶領(lǐng)大家一起研究并學(xué)習(xí)一下“JavaScript中數(shù)組去重的示例分析”這篇文章吧。

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一、前言：

我們在實際工作中，或者在面試找工作時，都會用到或者被問到一個問題，那就是“數(shù)組如何去重”。是的，這個問題有很多種解決方案，看看下面的十種方式吧！

二、數(shù)組去重方式大匯總：

Methods 1: 思路：定義一個新數(shù)組，并存放原數(shù)組的第一個元素，然后將元素組一一和新數(shù)組的元素對比，若不同則存放在新數(shù)組中。

function unique(arr){
 var res = [arr[0]];
 for(var i=1; i
Methods 2: 思路：先將原數(shù)組排序，在與相鄰的進(jìn)行比較，如果不同則存入新數(shù)組。
function unique2(arr){
 var arr2 = arr.sort();
 var res = [arr2[0]];
 for(var i=1; i
Methods 3: 利用對象屬性存在的特性，如果沒有該屬性則存入新數(shù)組。
function unique3(arr){
 var res = [];
 var obj = {};
 for(var i=0; i
Methods 4: 利用數(shù)組的indexOf下標(biāo)屬性來查詢。
function unique4(arr){
 var res = [];
 for(var i=0; i
Methods 5: 利用數(shù)組原型對象上的includes方法。
function unique5(arr){
 var res = [];
 
 for(var i=0; i
Methods 6: 利用數(shù)組原型對象上的 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: 利用數(shù)組原型對象上的 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: 利用數(shù)組原型對象上的 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: 利用數(shù)組原型對象上的 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數(shù)據(jù)結(jié)構(gòu)，它類似于數(shù)組，其成員的值都是唯一的
 return Array.from(new Set(arr)); // 利用Array.from將Set結(jié)構(gòu)轉(zhuǎn)換成數(shù)組
}

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，當(dāng)我把數(shù)組的長度變得很大的時候（如下所示），測試了一下不同方法的執(zhí)行時間長短，會發(fā)現(xiàn)方法三、四、五、六、七相對來說會更有優(yōu)勢，而方法八的執(zhí)行速度似乎一直墊底。你也可以在你本地跑一下試試！
//測試用的超大數(shù)組
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//這里只是舉例方法三（如果你把所有方法放在一起測試，會更直觀的看到執(zhí)行時間的差異）
var time3 = new Date().getTime();
function unique3(arr){
 var res = [];
 var obj = {};
 for(var i=0; i
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