5) 逻辑运算符(Logical operators [ˈlɑ:dʒɪkl]) 6) 字符串运算符(String operators) 7) 条件(三元)运算符(Conditional operator [kənˈdɪʃənəl) 8) 逗号运算符(Comma operator [ˈkɑ:mə]) 9) 一元运算符(Unary operators [ˈju:nəri]) 10) 关系运算符(Relational...
按照我对此运算符(operator)的早期理解,如果操作数(operand)“expr1”和“expr2”同时为真时,那么上面的代码片段将会执行任何位于if语句块中的内容。这是绝对正确的,并且恰好也是如此工作。唯一的蹊跷是,究竟幕后实际发生了什么。根据Mozilla的JavaScript文档对逻辑运算符(logical operators)的说明。 (逻辑与)若expr1可...
In fact, I would argue these operators shouldn’t even be called “logical operators”, as that name is incomplete in describing what they do. If I were to give them a more accurate (if more clumsy) name, I’d call them “selector operators,” or more completely, “operand selector o...
The logical OR operatorreturns the first true valueit finds (looking from left to right). If nothing is true in the statement, then it defaults to the last value (false in the previous code example). This makes itperfect for setting default values. It is also important to understand that ...
||logical or !logical not Note Logical operators are fully described in theJS Comparisonschapter. JavaScript Type Operators OperatorDescription typeofReturns the type of a variable instanceofReturns true if an object is an instance of an object type ...
Operator Usage Description Logical AND (&&) expr1 && expr2 Returns expr1 if it can be converted to false; otherwise, returns expr2. Thus, when used with Boolean values, && returns true if both operands are true; otherwise, returns false. Logical OR (||) expr1 || expr2 Returns expr1...
3. 逻辑运算符 (Logical operators) 4.比较运算符(Comparison operators) 5.位运算符(Bitwise operators) 6.字符串运算符(String operators) 7. 逗号运算符 (Comma operator) 8.关系运算符(Relational operator) 9.一元运算符(Unary operators) 10. 条件(三元)运算符 (Conditional operator) ...
运算符Operator:操作变量或值。6-40种 9个算术Arithmetic: + - * / 模% 递增++ 递减-- 正号+ 取反- 【addition/subtraction/multiplication/division/modulus/increment/decrement/?/decrement 1个字符串String:+ 3个逻辑Logical:逻辑与Logical AND && 逻辑或Logical OR || 逻辑非Logical NOT!
<!doctype html> JavaScript logical OR operator example h1 { color:red; border-bottom: 3px groove silver; padding-bottom: 8px; } JavaScript logical OR operator example
JavaScript supports the following logical operators −Assume that the value of x is 10 and y is 0.OperatorDescriptionExample && (Logical AND) If both the operands are non-zero, then the condition becomes true. (x && y) is false || (Logical OR) If any of the two operands are non-...