var a = 0x1; var b = 0x2; var c = 0x4; var d = a | b; //d是由a,b加起来 //判断d是由a,b,c哪些加起来 d & a == a; //是否包换a d & b == b;//是否包换b d & c == c;//是否包换c
var a = 0x1; var b = 0x2; var c = 0x4; var d = a | b; //d是由a,b加起来 //判断d是由a,b,c哪些加起来 d & a == a; //是否包换a d & b == b;//是否包换b d & c == c;//是否包换c