How to convert string to number in javascript
Method: 1. Use the Number() function, the syntax format is "Number (string object)"; 2. Use the parseInt() function, the syntax format is "parseInt (string object)"; 3. Use parseFloat () function, syntax format "parseFloat (string object)".
The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.
Convert javascript string to number
①Use Number() function
Pass Number The () conversion function passes in a string, and it will try to convert it into an integer or floating point number literal. This method can only convert based on decimal, and non-numeric characters cannot appear in the string, otherwise NaN will be returned.
Number("023") // returns 23
Number(023) // returns 19Note: 023 is actually an octal number, and no matter what you do, it returns 19; the same is true for hexadecimal numbers without single or double quotes.
② Use the parseInt() function
It is a global function, does not belong to any class method, and only parses integers. If the string prefix is "0x" or "0X", parseInt() interprets it as a hexadecimal number. It skips any number of leading spaces, parses as many numeric characters as possible, ignores what follows, and returns NaN if the first non-space character is a non-numeric character. For example:
[Recommended learning: javascript advanced tutorial]
parseInt() can also receive a second optional parameter, This parameter specifies the base for number conversion. The legal value range is 2~36, for example:
③ Use the parseFloat() function:
It is also a global function and does not belong to any class method. It can parse integers and floating point numbers. It does not recognize the hexadecimal prefix "0x" or "0X". It also skips any number of leading spaces when parsing, parses as many numeric characters as possible, ignores what follows, and returns NaN if the first non-space character is a non-numeric character. For example:
For more programming-related knowledge, please visit: Introduction to Programming! !
The above is the detailed content of How to convert string to number 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
AI Hentai Generator
Generate AI Hentai for free.
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
1382
52
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 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
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?
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
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
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.
PHP String Operation: Remove Extra Commas and Keep Only Commas Implementation Tips
Mar 28, 2024 pm 03:02 PM
PHP String Operation: Remove Extra Commas and Keep Only Commas Implementation Tips In PHP development, string processing is a very common requirement. Sometimes we need to process the string to remove extra commas and retain the only commas. In this article, I'll introduce an implementation technique and provide concrete code examples. First, let's look at a common requirement: Suppose we have a string containing multiple commas, and we need to remove the extra commas and keep only the unique comma. For example, replace "apple,ba
How to convert string to float in PHP
Mar 27, 2024 pm 12:48 PM
Converting a string to a floating point number is a common operation in PHP and can be accomplished through built-in methods. First make sure that the string is in a legal floating point format before it can be successfully converted to a floating point number. The following will detail how to convert a string to a floating point number in PHP and provide specific code examples. 1. Use (float) cast In PHP, the simplest way to convert a string into a floating point number is to use cast. The way to force conversion is to add (float) before the string, and PHP will automatically convert it
