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Negating and negating again in javascript is meaningless_javascript skills
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JS Tutorial
Negating and negating again in javascript is meaningless_javascript skills
Negating and negating again in javascript is meaningless_javascript skills
May 16, 2016 pm 04:53 PMOperator~ means bitwise negation. On the surface, ~~ (reverse and then negate) is meaningless. In fact, floating point numbers can be turned into integers in JS.
Copy code The code is as follows:
<html>
<script>
var myArray = new Array();
myArray.push("a");
myArray.push("b");
myArray.push("c");
myArray .push("d");
//Now we need to randomly take out an element from the array
var random = myArray[~~(Math.random()*myArray.length)]; // Math.random() returns a pseudo-random number between 0 and 1, which may be 0 but is always less than 1, [0,1)
var i = 7.94;
i = ~~i ;
alert(i);
var j = 7.34;
j = ~~j;
alert(j);
</script>
</html>
As above, if there is no ~~, then the decimal is randomly obtained, and the decimal part of the decimal is removed, leaving the integer. As above i=7, j=7. However, this mechanism does not exist in C. A floating point number (float) cannot be bitwise inverted in C, and forced type conversion can be used in C (but there is no such mechanism in JS. Floating point numbers are converted to integers. ) achieves the same purpose (discarding the decimal part and retaining the integer part).
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