JavaScript if语句中的多个或语句

Question

Okay, I'm fairly comfortable with basic If statements and know that if I want to say "When X is equal to 1 and Y is equal to 2 do whatever" I can write it as:

if ((X=="1") && (Y=="2")) { 

But how do you write this:

If X is equal to 1 or 2 and Y is equal to 1 or 2, do whatever...

I tried the following, but none of these work.

if ((X=="1" || x=="2") && (Y=="2" || y=="1")) { 

if ((X=="1") || (x=="2") && (Y=="2") || (Y=="1")) { 

Can someone explain to me what the format is?

Answer 1

与大多数语言一样，JavaScript区分大小写。

if ((X == "1" || X == "2") && (Y == "2" || Y == "1")) { 

Answer 2

if ((X=="1" || x=="2") && (Y=="2" || y=="1")) {很好，只是X和x是不同的变量Y和y ）。

Answer 3

检查您的情况， x与X不同。

Answer 4

Be careful with the names of your variables (they are case-sensitive):

x is not the same as X
y is not the same as Y

this should work:

if ((X=="1" || X=="2") && (Y=="1" || Y=="2")) {