我在解释Java运算符的不平等时遇到一些问题

Question

For my little app I need to do some very simple math... But for some reason I am having trouble doing it with JavaScript.

Here is the code:

(elLeftY <= elementLeftY <= elRightY)

If one of the "questions" is false but the other one is true this little code will always output true... What I want is that only when the two "questions" are true then it equals true but if one of the two is false then it equals false.

Thanks allot in advance.

Answer 1

You can't do it like that in javascript. You need this instead:

(elLeftY <= elementLeftY) && (elementLeftY <= elRightY)

Here is how your current code is being evaluated:

(elLeftY <= elementLeftY <= elRightY)
((elLeftY <= elementLeftY) <= elRightY)
(true <= elRightY)
(1 <= elRightY)
true

Answer 2

您无法在Javascript中级联相等检查，您必须将它们分成两个表达式。

((elLeftY <= elementLeftY) && (elementLeftY <= elRightY))