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This article mainly introduces the relevant knowledge of "how to use the splice() method in JavaScript". Xiaobian shows you the operation process through actual cases. The operation method is simple and fast and practical. I hope this article "how to use the splice() method in JavaScript" can help you solve the problem.

definition and use

The splice() method is used to insert, delete, or replace elements of an array.

syntax arrayObject.splice(index, howmany, element1,..., elementX) Parameter Description index

Required. Specify where elements are added/removed from.

This parameter is the subscript of the array element to start inserting and/or deleting. It must be a number.

howmany

Required. Specify how many elements should be removed. Must be a number, but can be "0."

If this parameter is not specified, all elements from index to the end of the original array are deleted.

element1 is optional. Specifies the new element to add to the array. Insert from index. elementX is optional. Several elements can be added to an array. return value

If an element is deleted from an arrayObject, an array containing the deleted element is returned.

description

The splice() method deletes zero or more elements starting at index and replaces those deleted elements with one or more values declared in the parameter list.

Tips and comments

Note: Note that the slice () method does something different than the slice() method, which modifies the array directly.

Example 1

In this example, we will create a new array and add an element to it:

var arr = new Array(6)arr[0] = "George"arr[1] = "John"arr[2] = "Thomas"arr[3] = "James"arr[4] = "Adrew"arr[5] = "Martin"[xss_clean](arr + "")arr.splice(2,0,"William")[xss_clean](arr + "")

Output:

George,John,Thomas,James, Addrew, Martin George,John,William,Thomas,James, Addrew,Martin Example 2

In this example we will delete the element at index 2 and add a new element to replace the deleted element:

var arr = new Array(6)arr[0] = "George"arr[1] = "John"arr[2] = "Thomas"arr[3] = "James"arr[4] = "Adrew"arr[5] = "Martin"[xss_clean](arr + "")arr.splice(2,1,"William")[xss_clean](arr)

Output:

George,John,Thomas,James, Addrew,Martin Example 3

In this example we will delete the three elements starting with index 2 ("Thomas") and add a new element ("William") to replace the deleted elements:

var arr = new Array(6)arr[0] = "George"arr[1] = "John"arr[2] = "Thomas"arr[3] = "James"arr[4] = "Adrew"arr[5] = "Martin"[xss_clean](arr + "")arr.splice(2,3,"William")[xss_clean](arr)

Output:

George,John,Thomas,James,Adrew, Martin George,John,William,Martin on "How to use the splice() method in JavaScript" content introduced here, thank you for reading. If you want to know more about industry-related knowledge, you can pay attention to the industry information channel. Xiaobian will update different knowledge points for you every day.

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