js 常見邏輯運算符 - daniel-qa/Vue GitHub Wiki

Operator	Name	Example	Description
==	Equal	x == y	Returns `true` if `x` and `y` are equal.
!=	Not equal	x != y	Returns `true` if `x` and `y` are not equal.
>	Greater than	x > y	Returns `true` if `x` is greater than `y`.
<	Less than	x < y	Returns `true` if `x` is less than `y`.
>=	Greater than or equal to	x >= y	Returns `true` if `x` is greater than or equal to `y`.
<=	Less than or equal to	x <= y	Returns `true` if `x` is less than or equal to `y`.
&&	Logical AND	x && y	Returns `true` if both `x` and `y` are true.
\|\|	Logical OR	x \|\| y	Returns `true` if at least one of `x` or `y` is true.
!	Logical NOT	!x	Returns `true` if `x` is false, or `false` if `x` is true.
??	Nullish coalescing	x ?? y	Returns `x` if `x` is not `null` or `undefined`, otherwise returns `y`.