How to use string objects in JavaScript
How to use string objects in JavaScript: First use new to create a string object; then give a suitable object name; finally pass the string "hello world" as a parameter and output it.
The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.
Built-in functions refer to objects prepared in advance by JavaScript. The String object is a built-in function that can be used to process strings. The following article will introduce to you the use of string objects in JavaScript. method.
First of all, let’s take a brief look at the representative built-in functions
String: Processing strings
Number: Processing numbers
Boolean: Processing logical values
Array: Processing arrays
Date: Processing dates
Math: Processing through numerical calculations
Built-in function represents starting from the beginning The content of the function has already been determined, so there is no need to define it again, just execute it, which is very convenient.
When using built-in objects, we use new to create objects, as shown below.
var 对象名称= new object（）;
Let’s actuallyCreate a string object
We give the appropriate object name and use the string hello world as a parameter Pass it and then output it
var s = new String("hello world");Note: Don’t forget to enclose it with "" or '' when outputting the string.
Let’s look at the specific code
<!DOCTYPE html>
<html>
</body>
</html>
<head>
<meta charset="utf-8">
<title>JavaScript</title>
</head>
<body>
<script>
var s=new String("hello world");
</script>
</body>
</html>After creation, let’s call it using console.log.
Let’s call the properties of the string object
The properties of the string object have the following three properties
Attribute 1 .length (the output length of the string)
Confirm the calling method of the object property.
If you continue to use the attribute name with "." in the variable name, you can call the attribute value.
<script> var s = new String("hello world"); console.log(s.length); </script>
You can see the following figure in the console
Since the number of characters in hello world is 11 characters, the output is " 11". (Spaces are also included)
Attribute 2. charAt (get the number of characters from the left and output it)
<script>
var s=new String("hello world");
console.log(s.charAt(1));
</script>You can see it in the console as shown below
#We specified the first character, so it appears as e. (The number of characters starts from 0)
Attribute 3.replace (replace character)
<script>
var s=new String("hello world");
console.log(s.replace("world","php中文网"));
</script>You can see it in the console as shown below
replace can replace the string, and world is replaced by php Chinese network.
The above is the detailed content of How to use string objects in JavaScript. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1653
14
1413
52
1305
25
1251
29
1224
24
What should I do if I encounter garbled code printing for front-end thermal paper receipts?
Apr 04, 2025 pm 02:42 PM
Frequently Asked Questions and Solutions for Front-end Thermal Paper Ticket Printing In Front-end Development, Ticket Printing is a common requirement. However, many developers are implementing...
Demystifying JavaScript: What It Does and Why It Matters
Apr 09, 2025 am 12:07 AM
JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.
Who gets paid more Python or JavaScript?
Apr 04, 2025 am 12:09 AM
There is no absolute salary for Python and JavaScript developers, depending on skills and industry needs. 1. Python may be paid more in data science and machine learning. 2. JavaScript has great demand in front-end and full-stack development, and its salary is also considerable. 3. Influencing factors include experience, geographical location, company size and specific skills.
How to achieve parallax scrolling and element animation effects, like Shiseido's official website?
or:
How can we achieve the animation effect accompanied by page scrolling like Shiseido's official website?
Apr 04, 2025 pm 05:36 PM
Discussion on the realization of parallax scrolling and element animation effects in this article will explore how to achieve similar to Shiseido official website (https://www.shiseido.co.jp/sb/wonderland/)...
Is JavaScript hard to learn?
Apr 03, 2025 am 12:20 AM
Learning JavaScript is not difficult, but it is challenging. 1) Understand basic concepts such as variables, data types, functions, etc. 2) Master asynchronous programming and implement it through event loops. 3) Use DOM operations and Promise to handle asynchronous requests. 4) Avoid common mistakes and use debugging techniques. 5) Optimize performance and follow best practices.
The Evolution of JavaScript: Current Trends and Future Prospects
Apr 10, 2025 am 09:33 AM
The latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.
How to merge array elements with the same ID into one object using JavaScript?
Apr 04, 2025 pm 05:09 PM
How to merge array elements with the same ID into one object in JavaScript? When processing data, we often encounter the need to have the same ID...
How to implement panel drag and drop adjustment function similar to VSCode in front-end development?
Apr 04, 2025 pm 02:06 PM
Explore the implementation of panel drag and drop adjustment function similar to VSCode in the front-end. In front-end development, how to implement VSCode similar to VSCode...
