The differences between delete and splice in the array deleted by js, deletesplice

The differences between delete and splice in the array deleted by js, deletesplice

For example, there is an array: var textArr = ['A', 'B', 'C', 'D'];

In this case, I want to delete Element B from this array:

Method 1: delete an array

Delete textArr [1] Results: ["a", undefined, "c", "d"]

The key value of the deleted element becomes undefined.

Method 2: aplice deletes an array

Splice (index, len, [item])

Note: This method will change the original array.

Index:Array start subscript

Len:Length of replacement/Deletion

Item:The value to be replaced. If the delete operation is used, the item is null.

TextArr. splice (); Result: ["a", "c", "d"] directly deletes the array and changes the value of the array.

The differences between the delete and splice elements in the above js deletion array are all the content shared by the editor. I hope you can give us a reference and support for the guests.