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。
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; iMethods 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; iMethods 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; iMethods 4: 利用数组的indexOf下标属性来查询。
function unique4(arr){
var res = [];
for(var i=0; iMethods 5: 利用数组原型对象上的includes方法。
function unique5(arr){
var res = [];
for(var i=0; iMethods 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; iMethods 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 = {};
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分享名称：JavaScript中数组去重的示例分析-创新互联
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