Thoughts on a website registration verification code

The following is a website verification code prompt

< Script Type = " Text/JavaScript " >
// Javascript

Function Show (){
Alert ( 2   < A <   3 );
}

Show (1);
</SCRIPT>

 

This is a simple section.CodeThe experts who have studied Java and C # certainly suddenly think that "this is impossible, and the syntax is too good"

I thought so at the time.

 

After that, I thought that I could not register something. I couldn't simply perform the analysis. First, I felt that if I could run it, it would be false.

 

Registration failed!

 

I have to work hard to open editplus and stick it to the Code to run it.

 

True is incredible!

 

Think twice about it. Open QQ and ask the experts for an explanation.

 

If the type is false, it is automatically converted to 0.

 

If yes, It is 2 <1 → false

Convert false to 00 <3 → true

PS: Alert is equivalent to the consystemic. Write () that has a reload processing project on the string.

I often write weak types (JavaScript) and strong types (Java, C .....

Let's test the following code:

0 . Alert (number ( False ));
1 . Alert ( - 1 < A <   - 2 )
2 . Alert ( 8 - True )
3 . Alert ( True + False )

 

After running, I believe you will understand .....