javascript - JS: Why is ~10 (binary, ~1010) = -11 (binary, -1011)? -


In Javascript, if I do not do bit bit bit bit I hope that it will not calculate bitwise on the binary integer: 

 
   Code> ~ 1010 = 0101

In other words, I was expecting the decimal integer 5. Instead, the Operation gives me-11 (if you see it in the console) 

  ~ 10 = -11

If I use that -11 and ~ Seeing 10 as binary integer string: 

  parseInt (~ 10,10) .toString (2) "-1011" parseInt (-11,10) .string (2) "-1011"

Compatible but I do not understand. Can anyone explain to me why? I think it has to do something with the signal.

EDIT: After posting, it also helped me understand this phenomenon better.

Bitwise operators in Javascript consider the operator number as 32 bits. Then the result is: 

  00000000 00000000 00000000 00001010

When you reverse it, the result is: 

  11111111 11111111 11111111 11110101

When a 32-bit sign is interpreted as a number, then -11 (if you do not understand, read Wikipedia entry).


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