Introduction to Javascript bitwise AND operator (&) _ basic knowledge

Javascript bitwise AND operator (& amp;) is used to perform bitwise "and" operations on two 32-bit expressions. Generally, the expressions are decimal integers, in this case, you need to first convert it to the corresponding binary, and then add 0 to the forward to supplement the 32-bit The Code is as follows:

Result = [integer 1] & [integer 1]

& Perform the bitwise "and" operation on each bit of two 32-bit expressions. If both bits are 1, the result is 1. Otherwise, the result is 0.

Bit 1	Bits 2	Bitwise AND
0	0	0
1	1	1
0	1	0
1	0	0

The following example shows how to use the & bitwise AND operator and the & = bitwise AND value assignment operator:

The Code is as follows:

// 9 the binary value is 1001, and the 32-bit complement value is 00000000000000000000000000001001.
Var expr1 = 9;

// 5 is 00000000000000000000000000000101
Var expr2 = 5;

/*
00000000000000000000000000001001
&
00000000000000000000000000000101
=
00000000000000000000000000000001
=
1
*/

Var result = expr1 & expr2;

Alert (result );
// [1] is displayed]

Expr1 & = expr2;
Alert (expr1 );
// [1] is displayed]