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There are three logical operators in js: 1. Logic and operator "& &". Return true;2, logic or operator "| |" only when both operands are true. If one of the operands is true, return true;3, logical non-operator "!". If the Operand is not true, true is returned.

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

Logical operators are usually used to combine multiple expressions. The result of a logical operator is a Boolean, and there can only be two results, either true or false. The logical operators supported in JavaScript are listed in the following table:

Example of operator name & & logical and x & & y means true if both x and y are true | | logical or x | | y means true if either x or y is true! Logic is not! X means that if x is not true, it is true.

Logic and operations (& &) are AND Boolean operations. Return true only if both operands are true, otherwise return false.

Logic or operation (| |) is a Boolean OR operation. If both operands are true, or one of them is true, true is returned, otherwise false is returned.

Logical non-operation (!) is a Boolean inverse operation (NOT). As a unary operator, it is placed directly before the Operand, converting the value of the Operand to a Boolean value, then inverting it and returning it.

Example:

Var year = 2022 if / leap year is divisible by 400 or 4, but not divisible by 100. if ((year% 100! = 0) & & (year% 4 = = 0)) {console.log (year + "year is a leap year.") ;} else {console.log (year + "the year is an ordinary year.") ;}

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