Home Web Front-end JS Tutorial How to intercept a string in javascript

How to intercept a string in javascript

Apr 01, 2021 pm 06:00 PM
javascript string

How to intercept strings in javascript: 1. Use the substr() function to intercept the specified number of characters starting from the specified subscript in the string; 2. Use the substring() function to intercept the string intermediary The character between the two specified subscripts.

How to intercept a string in javascript

The operating environment of this tutorial: Windows 7 system, ECMAScript version 5, Dell G3 computer.

Method 1: Use substr()

<script type="text/javascript">
var str="Hello world!";
console.log(str);
console.log(str.substr(3,9));  //从倒数第六个字符开始,截取四位
</script>
Copy after login

Rendering:

How to intercept a string in javascript

The substr() method can extract the specified number of characters starting from the start subscript in the string.

Syntax:

substr(start,length)
Copy after login
  • start: The starting subscript of the substring to be intercepted must be a numerical value. If negative, this parameter is the position from the end of the string. That is to say, -1 refers to the last character in the string, -2 refers to the second to last character, and so on. You must write

  • length: the characters in the substring Number must be a numerical value. If this parameter is not filled in, the characters from the beginning to the end of the string are returned. If length is 0 or negative, an empty string will be returned.

Example:

Method 2: Use substring()

<script type="text/javascript">
var str="Hello world!";
console.log(str);
console.log(str.substring(3,9));  //从第三个字符开始到第八位
</script>
Copy after login

Rendering:

How to intercept a string in javascript

The substring() method is used to extract the characters between two specified subscripts in the string.

Syntax:

substring(start,stop)
Copy after login
  • start: a non-negative integer, which refers to the first character of the substring to be extracted. Position in the string, required element

  • #stop: a non-negative integer, 1 more than the position of the last character of the substring to be extracted on the string, optional You can write it or not. If you do not write it, the returned substring will go to the end of the string.

The length of the string is stop-start

If the parameters start and If stop is equal, the method returns an empty string. If start is greater than stop, the method will exchange the two parameters before extracting the substring.

For more programming related knowledge, please visit: Programming Video! !

The above is the detailed content of How to intercept a string in javascript. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How to determine whether a Golang string ends with a specified character How to determine whether a Golang string ends with a specified character Mar 12, 2024 pm 04:48 PM

Title: How to determine whether a string ends with a specific character in Golang. In the Go language, sometimes we need to determine whether a string ends with a specific character. This is very common when processing strings. This article will introduce how to use the Go language to implement this function, and provide code examples for your reference. First, let's take a look at how to determine whether a string ends with a specified character in Golang. The characters in a string in Golang can be obtained through indexing, and the length of the string can be

Detailed explanation of the method of converting int type to string in PHP Detailed explanation of the method of converting int type to string in PHP Mar 26, 2024 am 11:45 AM

Detailed explanation of the method of converting int type to string in PHP In PHP development, we often encounter the need to convert int type to string type. This conversion can be achieved in a variety of ways. This article will introduce several common methods in detail, with specific code examples to help readers better understand. 1. Use PHP’s built-in function strval(). PHP provides a built-in function strval() that can convert variables of different types into string types. When we need to convert int type to string type,

How to repeat a string in python_python repeating string tutorial How to repeat a string in python_python repeating string tutorial Apr 02, 2024 pm 03:58 PM

1. First open pycharm and enter the pycharm homepage. 2. Then create a new python script, right-click - click new - click pythonfile. 3. Enter a string, code: s="-". 4. Then you need to repeat the symbols in the string 20 times, code: s1=s*20. 5. Enter the print output code, code: print(s1). 6. Finally run the script and you will see our return value at the bottom: - repeated 20 times.

How to check if a string starts with a specific character in Golang? How to check if a string starts with a specific character in Golang? Mar 12, 2024 pm 09:42 PM

How to check if a string starts with a specific character in Golang? When programming in Golang, you often encounter situations where you need to check whether a string begins with a specific character. To meet this requirement, we can use the functions provided by the strings package in Golang to achieve this. Next, we will introduce in detail how to use Golang to check whether a string starts with a specific character, with specific code examples. In Golang, we can use HasPrefix from the strings package

How to intercept a string in Go language How to intercept a string in Go language Mar 13, 2024 am 08:33 AM

Go language is a powerful and flexible programming language that provides rich string processing functions, including string interception. In the Go language, we can use slices to intercept strings. Next, we will introduce in detail how to intercept strings in Go language, with specific code examples. 1. Use slicing to intercept a string. In the Go language, you can use slicing expressions to intercept a part of a string. The syntax of slice expression is as follows: slice:=str[start:end]where, s

How to solve the problem of Chinese garbled characters when converting hexadecimal to string in PHP How to solve the problem of Chinese garbled characters when converting hexadecimal to string in PHP Mar 04, 2024 am 09:36 AM

Methods to solve Chinese garbled characters when converting hexadecimal strings in PHP. In PHP programming, sometimes we encounter situations where we need to convert strings represented by hexadecimal into normal Chinese characters. However, in the process of this conversion, sometimes you will encounter the problem of Chinese garbled characters. This article will provide you with a method to solve the problem of Chinese garbled characters when converting hexadecimal to string in PHP, and give specific code examples. Use the hex2bin() function for hexadecimal conversion. PHP’s built-in hex2bin() function can convert 1

PHP String Matching Tips: Avoid Ambiguous Included Expressions PHP String Matching Tips: Avoid Ambiguous Included Expressions Feb 29, 2024 am 08:06 AM

PHP String Matching Tips: Avoid Ambiguous Included Expressions In PHP development, string matching is a common task, usually used to find specific text content or to verify the format of input. However, sometimes we need to avoid using ambiguous inclusion expressions to ensure match accuracy. This article will introduce some techniques to avoid ambiguous inclusion expressions when doing string matching in PHP, and provide specific code examples. Use preg_match() function for exact matching In PHP, you can use preg_mat

PHP string manipulation: a practical way to effectively remove spaces PHP string manipulation: a practical way to effectively remove spaces Mar 24, 2024 am 11:45 AM

PHP String Operation: A Practical Method to Effectively Remove Spaces In PHP development, you often encounter situations where you need to remove spaces from a string. Removing spaces can make the string cleaner and facilitate subsequent data processing and display. This article will introduce several effective and practical methods for removing spaces, and attach specific code examples. Method 1: Use the PHP built-in function trim(). The PHP built-in function trim() can remove spaces at both ends of the string (including spaces, tabs, newlines, etc.). It is very convenient and easy to use.

See all articles