Use of logical operators in JavaScript

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

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Use of logical operators in JavaScript