JavaScript Bitwise Operators Bit operators work on 32 bits numbers. OperatorDescriptionExampleSame asResultDecimal &AND5 & 10101 & 000100011 |OR5 | 10101 | 000101015 ~NOT~ 5~0101101010 ^XOR5 ^ 10101 ^ 000101004 <<left shift5 << 10101 << 1101010 ...
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) ...
flags =LOG_ERRORS;// 0001flags =LOG_ERRORS|LOG_WARNINGS|LOG_INCOMING;// 1011 因为标志位一般只需要 1 bit,就可以保存,并没有必要为每个标志位都定义一个变量。所以按上面这种方式只使用一个变量,却可以保存大量的信息——无符号的 char 可以保存 8 个标志位,而无符号的 int 则可以同时表示 32 个标志位...
Bitwise operators treat its operands as a set of 32-bit binary digits (zeros and ones) and perform actions. However, the result is shown as a decimal value. OperatorsNameExample & Bitwise AND x & y | Bitwise OR x | y ^ Bitwise XOR x ^ y ~ Bitwise NOT ~x << Left shift x << ...
OperatorsBitwise Operators Bitwise Operators 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),而不是十进制、十六进制或八进制数值。例如,十进制数9,用二进制表示则为1001。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。下面的表格总结了JavaScript中的...
JavaScript Bitwise Operators OperatorNameDescription &ANDSets each bit to 1 if both bits are 1 |ORSets each bit to 1 if one of two bits is 1 ^XORSets each bit to 1 if only one of two bits is 1 ~NOTInverts all the bits <<Zero fill left shiftShifts left by pushing zeros in from...
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。
The bitwise shift operators take two operands: the first is a quantity to be shifted, and the second specifies the number of bit positions by which the first operand is to be shifted. The direction of the shift operation is controlled by the operator used. ...
Four of these operators perform Boolean algebra on the individual bits of the operands, behaving as if each bit in each operand were a boolean value (1=true, 0=false). The other three bitwise operators are used to shift bits left and right. These operators are not commonly used in ...
most languages, these operators are very close to the hardware and very fast. In JavaScript, they are very far from the hardware and very slow.JavaScript is rarely used for doing bit manipulation.-- Douglas Crockford in "JavaScript: The Good Parts", Appendix B, Bitwise Operators (emphasis ...