Analysis of the difference between JS array merge push and concat_javascript skills

The example in this article describes the difference between JS array merge push and concat. Share it with everyone for your reference, the details are as follows:

Pay attention to the spelling of concat. The two functions are very similar, but there are two differences.

Look at the code first:

var arr = [];
arr.push(1);
arr.push([2, 3]);
arr.push(4, 5);
arr = arr.concat(6);
arr = arr.concat([7, 8]);
arr = arr.concat(9, 10);
arr.each(function(index, value){
  alert(value);
});

alert result:

1
2,3
4
5
6
7
8
9
10

Difference:

When push encounters an array parameter, it treats the entire array parameter as one element; while concat splits the array parameter and adds it element by element.
push directly changes the current array; concat does not change the current array.

Summary:

If you want to append to the array, use concat, but it is the same as java's replace. Remember arr1=arr1.concat(arr2)

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