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This article mainly introduces the JavaScript array element operation method related knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe that everyone after reading this JavaScript array element operation method article will have a harvest, let's take a look at it.

Access the first array element

Example

Fruits = ["Banana", "Orange", "Apple", "Mango"]

Var first = fruits [0]

Access the last array element

Example

Fruits = ["Banana", "Orange", "Apple", "Mango"]

Var last = fruits [fruits.length-1]

Traversing array elements

The safest way to traverse an array is to use the "for" loop:

Example

Var fruits, text, fLen, i

Fruits = ["Banana", "Orange", "Apple", "Mango"]

FLen = fruits.length

Text = ""

For (I = 0; I < fLen; iTunes +) {

Text + = "" + fruits [I] + ""

}

You can also use the Array.foreach () function:

Example

Var fruits, text

Fruits = ["Banana", "Orange", "Apple", "Mango"]

Text = ""

Fruits.forEach (myFunction)

Text + = ""

Function myFunction (value) {

Text + = "" + value + ""

}

Add array elements

The best way to add new elements to an array is to use the push () method:

Example

Var fruits = ["Banana", "Orange", "Apple", "Mango"]

Fruits.push ("Lemon"); / / add a new element (Lemon) to fruits

You can also use the length attribute to add new elements to the array:

Example

Var fruits = ["Banana", "Orange", "Apple", "Mango"]

Fruits [fruits.length] = "Lemon"; / / add a new element (Lemon) to fruits

Warning!

Add elements with the highest index to create undefined "holes" in the array:

Example

Var fruits = ["Banana", "Orange", "Apple", "Mango"]

Fruits [6] = "Lemon"; / / add a new element (Lemon) to fruits

This is the end of the article on "methods for manipulating JavaScript array elements". Thank you for reading! I believe you all have a certain understanding of the knowledge of "how to operate JavaScript array elements". If you want to learn more, you are welcome to follow the industry information channel.

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