根据Mozilla的JavaScript文档对逻辑运算符(logical operators)的说明。 (逻辑与)若expr1可转换为false[译注1],则返回expr1;否则,返回expr2。因此,当使用布尔值时,若两个操作数都是true,则&&运算符返回true;否则,返回false。 因此换言之,这意味着,若expr1为真,则expr1 && expr2将返回expr2,否则将返回expr1。
按位操作符(Bitwise operators) 将其操作数(operands)当作32位的比特序列(由0和1组成),前 31 位表示整数的数值,第 32 位表示整数的符号,0 表示正数,1 表示负数。例如,十进制数18,用二进制表示则为10010。按位操作符操作数字的二进制形式,但是返回值依然是标准的JavaScript数值。 按位与( AND) 对于每一个比...
逻辑或运算符: https://mariusschulz.com/blog/the-and-and-or-operators-in-javascript
3条件(三元)运算符从右到左… ? … : … 2赋值从右到左… = … … += … … -= … … **= … … *= … … /= … … %= … … <<= … … >>= … … >>>= … … &= … … ^= … … |= … … &&= … … ||= … ...
Example 4: Logical Operators in JavaScript let x = 3; // logical AND console.log((x < 5) && (x > 0)); // true console.log((x < 5) && (x > 6)); // false // logical OR console.log((x > 2) || (x > 5)); // true console.log((x > 3) || (x < 0)); // ...
Repetition Operators | 操作员 | 意义 | 描述 | | --- | --- | --- | | `?` | 0 – 1 | 没有或一个 | | `*` | 0 –∞ | 没有或任何 | | `+` | 1 –∞ | 一个或任何 | | `{num}` | 数字 | 准确数字 | | `{min,}` | 最小 –∞ | 最小最小值 | | `{,max}`...
In JavaScript, we use comparison operators to compare two values and find the resulting boolean value (true or false). For example, // less than operator console.log(4 < 5); // Output: true Run Code In the above example, we used the < operator to find the boolean value for the cond...
JavaScript provides the following logical operators. OperatorDescription && && is known as AND operator. It checks whether two operands are non-zero or not (0, false, undefined, null or "" are considered as zero). It returns 1 if they are non-zero; otherwise, returns 0. || || is ...
JavaScript usesarithmetic operators(+-*/) tocomputevalues: (5+6) *10 Try it Yourself » JavaScript uses anassignment operator(=) toassignvalues to variables: letx, y; x =5; y =6; Try it Yourself » JavaScript Expressions An expression is a combination of values, variables, and operat...
Since we’re talking about type coercion and comparisons, it’s worth mentioning that comparingNaNwithanything(evenNaN!) willalwaysreturnfalse.You therefore cannot use the equality operators (==,===,!=,!==) to determine whether a value isNaNor not.Instead, use the built-in globalisNaN()fu...