JS rounding tips

js integer

Actually, it is a small knowledge point, but I feel it is very useful, so I will record it here . We generally js Rounding is used parseInt To round up , For example, the following situation ：

But you can also use the following methods

This operator is a bitwise non operator , This is a binary operator , I'll simply state his principle . The operation rule of bitwise negation is to first convert a number into binary , And then reverse by bit . The first bit is the sign bit , If 1 It means a negative number , All but the sign bits of the first bit are reversed again and then +1, If you want to know more about js Bit operators can refer to the W3C.
Because it is operating numbers in binary form, it will be more efficient and look more compelling , So why not use such a good thing *^*.