function unique4(arr){ var res = []; for(var i=0; i<arr.length; i++){ if(res.indexOf(arr[i]) == -1){ res.push(arr[i]); } } return res; } console.log('------------方法四---------------'); console.log(unique4([1,1,2,3,5,3,1,5,6,7,4]));

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<arr.length; i++){ if( !res.includes(arr[i]) ){ // 如果res新数组包含当前循环item res.push(arr[i]); } } return res; } console.log('------------方法五---------------'); console.log(unique5([1,1,2,3,5,3,1,5,6,7,4]));

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<arr.length; i++){ res.lastIndexOf(arr[i]) !== -1 ? '' : res.push(arr[i]); } return res; } console.log('------------方法九---------------'); console.log(unique9([1,1,2,3,5,3,1,5,6,7,4]));

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）