jquery array deletes elements at specified position

jQuery is a commonly used JavaScript library that is widely used in web development and design. In jQuery, arrays are a common data type, and various methods can be used to manipulate and manage the elements in the array. This article will introduce how to use jQuery array to delete elements at specified positions.

jQuery arrays are objects that represent collections of elements. They are usually created through selectors in HTML documents or XML documents. Some examples include:

var arr = ['apple', 'banana', 'orange', 'peach'];

In the example above, the array 'arr' has four elements: 'apple', 'banana', 'orange' and 'peach'.

The operation of deleting elements is usually a common task of array operations. Common methods include: pop(), shift(), splice(), delete, etc. The following will introduce how to use jQuery's splice() method to delete elements at specified positions.

The splice() method adds/removes items to/from the array and returns the removed item. This method mutates the original array.
splice() method is as follows:

array.splice(index, howmany, item1, ....., itemX)

Parameter description:

• index: required. An integer specifying the position at which to add/remove an item. Use a negative number to specify the position from the end of the array.
• howmany: required. The number of items to delete. If set to 0, items will not be deleted.
• item1, ..., itemX: optional. New items added to the array.

Now, let us see how to delete elements from an array using splice() method. For example, when we need to delete the second element (index 1) in the arr array, we can use the following code:

arr.splice(1,1);

The above code will delete the element located at the second index from the arr array , and only delete one element. If you need to delete multiple elements at one time, you can set the second parameter howmany to the number of elements that need to be deleted. For example, to delete both the second and third elements in the arr array, you can use the following code:

arr.splice(1,2);

In the above code, the first parameter specifies the position of the second element to be deleted (index 1), while the second parameter specifies the number of elements to remove (2).

It should be noted that the splice() method will change the original array. If you need to retain the original array, you can copy the array before executing splice(). For example, the following code creates a copy containing the elements of the arr array:

var copyArr = arr.slice(0);

Now, we know how to delete an element at a specified position using a jQuery array. In the actual coding process, we can use different array operation methods to operate and manage the elements in the array as needed.

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