Use of logical operators in JavaScript

Source: Internet
Author: User
Tags logical operators

Logical operators are used to perform logical operations on one or more Boolean values. There are 3 logical operators in JavaScript, as shown in the following table.

Operator

Describe

Example

&&

Logic and

A && b//When both A and B are true, the result is true, otherwise false

||

Logical OR

A | | b//When a is True or B is true, the result is true, otherwise false

!

Logical Non-

!a//When A is false, the result is true, otherwise false

For example, a park stipulates that children under the age of 10 or older persons over 60 years old can be enrolled in the entrance to determine whether a 12-year-old child can be enrolled in the admission. The code is as follows:

  <script type= "Text/javascript" >02  var =N;  if(age <= | | >=) {   document.write ("A child 12 years old can be enrolled in the park");  orelse{   document.write ("a 12-year-old child must not be allowed to be in a ticket");     </script>

The result of the operation is:

A 12-year-old child must not avoid admission to the park

This digest from Tomorrow Science and Technology published "0 basic JavaScript", reproduced please indicate the source!!!

Use of logical operators in JavaScript

Related Article

E-Commerce Solutions

Leverage the same tools powering the Alibaba Ecosystem

Learn more >

Apsara Conference 2019

The Rise of Data Intelligence, September 25th - 27th, Hangzhou, China

Learn more >

Alibaba Cloud Free Trial

Learn and experience the power of Alibaba Cloud with a free trial worth $300-1200 USD

Learn more >

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.