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This article introduces the knowledge of "how to delete elements according to subscript in js 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!

We all know that every element in the array has an ordinal, which starts at 0 and is called an Index. According to this array subscript, we can access the elements of the specified subscript in the form of the array name [subscript].

1, access to the specified element, delete operator to delete the element, but the length of the array will not change. The deleted element becomes an empty element.

Var arr=new Array ("banana", "apple", "pear", "orange", "orange", "durian"); console.log (arr); delete arr [1]; / / delete the element with subscript 1 (second element) console.log (arr)

2. Use the splice () method to delete one or more elements at the specified subscript location.

Syntax for deleting an element:

Array.splice (index,howmany)

The first parameter, index, can specify the location of the starting subscript (that is, where to start deleting the element)

The second parameter, howmany, specifies the number of elements that should be deleted (that is, one or more elements to be deleted).

Let's take a look at the following examples:

Var arr=: console.log (arr); arr.splice (1Magne2); console.log (arr); how to delete elements according to subscript in js 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!

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