What is the method that js does not change his own value?

This article introduces the relevant knowledge of "what is the method that js does not change its own value". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. The concat method is used to merge two or more arrays and return a new array.

Var array = [1, 2, 3] var array2 = array.concat (4, [5pr 6], [7 rect 8 rect 9]) console.log (array2) / / [1,2,3] the original array has not been modified. Console.log (array) / / [1,2,3]

2. The join method concatenates all the elements of an array into a string and returns the string.

Var array = ['We',' are', 'Chinese']; console.log (array.join ()) / / "We,are,Chinese" console.log (array.join (' +')) / / "We+are+Chinese"

3. The slice method returns a new array object, a shallow copy of the original array determined by begin and end.

Var array = ["one", "two", "three", "four", "five"] console.log (array.slice ()) / / ["one", "two", "three", "four", "five"] console.log (array.slice (2jue 3)) / / [three "] what is the method of js not changing its own value? thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!