JS数组去重方法总结

var arr=[2,8,5,0,5,2,6,7,2];
function unique1(arr){
  var hash=[];
  for (var i = 0; i < arr.length; i++) {
     if(hash.indexOf(arr[i])==-1){
      hash.push(arr[i]);
     }
  }
  return hash;

}

Array.prototype.distinct = function(){

 var arr = this,

  result = [],

  i,

  j,

  len = arr.length;

 for(i = 0; i < len; i++){

  for(j = i + 1; j < len; j++){

   if(arr[i] === arr[j]){

    j = ++i;

   }

  }

  result.push(arr[i]);

 }

 return result;

}

var arra = [1,2,3,4,4,1,1,2,1,1,1];

arra.distinct();    //返回[3,4,2,1]

Array.prototype.distinct = function (){

 var arr = this,

  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;

};

var a = [1,2,3,4,5,6,5,3,2,4,56,4,1,2,1,1,1,1,1,1,];

var b = a.distinct();

console.log(b.toString()); //1,2,3,4,5,6,56

Array.prototype.distinct = function (){

 var arr = this,

  i,

  obj = {},

  result = [],

  len = arr.length;

 for(i = 0; i< arr.length; i++){

  if(!obj[arr[i]]){ //如果能查找到，证明数组元素重复了

   obj[arr[i]] = 1;

   result.push(arr[i]);

  }

 }

 return result;

};

var a = [1,2,3,4,5,6,5,3,2,4,56,4,1,2,1,1,1,1,1,1,];

var b = a.distinct();

console.log(b.toString()); //1,2,3,4,5,6,56

Array.prototype.distinct = function (){

 var arr = this,

  len = arr.length;

 arr.sort(function(a,b){  //对数组进行排序才能方便比较

  return a - b;

 })

 function loop(index){

  if(index >= 1){

   if(arr[index] === arr[index-1]){

    arr.splice(index,1);

   }

   loop(index - 1); //递归loop函数进行去重

  }

 }

 loop(len-1);

 return arr;

};

var a = [1,2,3,4,5,6,5,3,2,4,56,4,1,2,1,1,1,1,1,1,56,45,56];

var b = a.distinct();

console.log(b.toString());  //1,2,3,4,5,6,45,56

Array.prototype.distinct = function (){

 var arr = this,

  result = [],

  len = arr.length;

 arr.forEach(function(v, i ,arr){  //这里利用map，filter方法也可以实现

  var bool = arr.indexOf(v,i+1);  //从传入参数的下一个索引值开始寻找是否存在重复

  if(bool === -1){

   result.push(v);

  }

 })

 return result;

};

var a = [1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,3,3,3,3,3,3,3,2,3,3,2,2,1,23,1,23,2,3,2,3,2,3];

var b = a.distinct();

console.log(b.toString()); //1,23,2,3

function dedupe(array){

 return Array.from(new Set(array));

}

dedupe([1,1,2,3]) //[1,2,3]

let arr = [1,2,3,3];

let resultarr = [...new Set(arr)];

console.log(resultarr); //[1,2,3]

function concatArr(arr1, arr2){

  var arr = arr1.concat(arr2);

  arr = unique1(arr);//再引用上面的任意一个去重方法

  return arr;

}

var a = [1, 2, 3];

var b = [4, 5, 6];

Array.prototype.push.apply(a, b);//a=[1,2,3,4,5,6]

//等效于:a.push.apply(a, b);

//也等效于[].push.apply(a, b);

function concatArray(arr1,arr2){

  Array.prototype.push.apply(arr1, arr2);

  arr1 = unique1(arr1);

  return arr1;