问题
I have converted JavaScript code which uses bit-wise operators in that code to Python code, but there is one problem when i do this in JavaScript and Python
412287 << 10
then I get this 422181888 same results in both languages. but when i do this in both
424970184 << 10
then i get different results in both of the languages 1377771520 in JavaScript and 435169468416 in Python
can anybody help me with this? any help would be appreciated.
回答1:
If you want the java-script equivalent value then what you can do is :
import ctypes
print(ctypes.c_int(424970184 << 10 ^ 0).value)
Output:
1377771520
回答2:
As stated in this SO answer, in javascript the bitwise operators and shift operators operate on 32-bit ints, and your second example overflows the 32 bit capacity, so the python equivalent would be:
(424970184 << 10) & 0x7FFFFFFF
(you get a "modulo"/"masked" value with the signed 32 bit integer mask, not the actual value)
In Python there's no limit in capacity for integers, so you get the actual value.
来源：https://stackoverflow.com/questions/41610186/difference-between-javascript-bit-wise-operator-code-and-python-bit-wise-operato