Logic and (& amp;) operations in js, logic in js

Logic and (&) operations in js, and logic in js

The preceding section describes the logic or operations. This section describes the logic and operations:

1. Logic and is very simple for boolean values. If there is a false value, false is returned.
2. If it is not a Boolean value:
A. if the first operand is an object, the second number is returned;
B. If the second operand is an object, this object is returned only when the evaluate result of the first operand is true;
C. If both operands are objects, the second operand is returned;
D. If one of the operands is null, null is returned;
E. If one of the operands is NaN, return NaN;
F. If the first operand is undefined, unfined is returned.