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。
1) 赋值运算符(Assignment operators [əˈsaɪnmənt] ['ɒpəreɪtəz]) 2) 比较运算符(Comparison operators [kəmˈpærɪsən]) 3) 算数运算符(Arithmetic operators [əˈrɪθmɪtɪk]) 4) 位运算符(Bitwise operators [bɪt'waɪz]) 5) 逻辑运算符(Log...
按位操作符 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) ...
逻辑或运算符: https://mariusschulz.com/blog/the-and-and-or-operators-in-javascript
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 ...
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)); // ...
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...
条件(三元)运算符是JavaScript 唯一使用三个操作数的运算符:一个条件后跟一个问号(?),如果条件为真值,则执行冒号(:)前的表达式;若条件为假值,则执行最后的表达式。该运算符经常当作 if...else 语句的简捷形式来使用。 尝试一下语法 jsCopy to Clipboard condition ? exprIfTrue : exprIfFalse 参数 condition...
In JavaScript,&∧||don't always produce a boolean value. Both operators always return the value of one of their operand expressions. Using the double negation!!or theBooleanfunction, "truthy" and "falsy" values can be converted to proper booleans. ...
Given that x = 6 and y = 3, the table below explains the logical operators: OperatorDescriptionExampleTry it && and (x < 10 && y > 1) is true Try it » || or (x == 5 || y == 5) is false Try it » ! not !(x == y) is true Try it »...