The method of element Operation in JavaScript Array
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.
