Access method of js one-dimensional array

This article introduces the relevant knowledge of "the access method of js one-dimensional array". 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. To access an array is to access the array elements. You can use the array name [subscript expression] to access, read and write the array.

2. A subscript expression is an expression whose value is a non-negative integer.

For example, above

Delete a [1]

Is to use the delete keyword to delete the element in the an array with the subscript 1 (that is, delete the second element).

And:

Var a = []; / / empty array a [0] = 1tera [2] = "hello"

That is, assign values to the elements in the an array with subscript 0 and 2, respectively, and elements with subscript 1 are undefined if they are not assigned. We can also use this form when we want to output specified array elements

Console.log (a [0]); / / read the first element and the return value is 1console.log (a [1]); / / read the second element with the return value of undefinedconsole.log (a [2]); / / read the third element with the return value of hello "access method of the js one-dimensional array". Thank you for 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!