Introduction to the use of Javascript bitwise AND operator (&)_Basic knowledge

Copy code The code is as follows:

result = [Integer 1] & [Integer 1]

& 对两个 32 位表达式的每一个位执行按位“与”运算。 如果两个位均为 1，则结果是 1。 否则，结果为 0。

位1	位2	位与
0	0	0
1	1	1
0	1	0
1	0	0

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

Copy code The code is as follows:

// 9 Binary is 1001, the complement of 32 bits is 00000000000000000000000000001001
var expr1 = 9;

// 5 is 000000000000000000000000000101
var expr2 = 5;

/*
0000000000000000000000000001001
& >00000000000000000000000000000101
=
000000000000000000000000000000001
=
1
*/

var result = expr1 & expr2;

alert(result);
// popup【1】

expr1 &= expr2;
alert(expr1);
//pop-up【1】