JS implementation of merging two arrays and removing duplicates, leaving only one method_javascript skills

The example in this article describes the JS method of merging two arrays and removing duplicates, leaving only one. Share it with everyone for your reference, the details are as follows:

//It's merge arr1 and arr2 , delete the same element only leave one
//It's only apdapter array. If object, no. 
//The sequence of the two array is not required.
mergeArray:function (arr1, arr2){ 
 for (var i = 0 ; i < arr1.length ; i ++ ){
   for(var j = 0 ; j < arr2.length ; j ++ ){
    if (arr1[i] === arr2[j]){
     arr1.splice(i,1); //利用splice函数删除元素，从第i个位置，截取长度为1的元素
    }
   }
 }
 //alert(arr1.length)
 for(var i = 0; i <arr2.length; i++){
  arr1.push(arr2[i]);
 }
 return arr1;
}

Another: The premise is that the items in the two arrays are not repeated. If they are repeated, the desired effect will not be achieved

I hope this article will be helpful to everyone in JavaScript programming.