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This article shares with you an example of how to manipulate js integers. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Operation of js integers

Using | 0 and ~ ~ can convert floating point to integer and is faster than similar parseInt,Math.round in terms of efficiency, which is useful when dealing with effects such as pixel and animation displacement. For performance comparison, see here.

Var foo = (12.4 / 4.13) | 0 governance / result is 3var bar = ~ (12.4 / 4.13); / / result is 3

There is another trick, that is! 2 exclamation marks, you can say a value, quickly converted to a Boolean value. You can test it!

Var eee= "eee"; alert (!! eee)

True is returned, which means that any value is preceded by!! Can always be equal to true. Unless this value is already a Boolean, or undefined, null, 0, false, NaN,'', because I mentioned undefined, null, 0, false, NaN,'', these are already false, so I added two!! After that, it's still fasle.

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