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Why does this occur:
window.onload = function(){
var bob=new Number(1);
for (var i=0; i<8 ;i++){
bob=Number(bob+1.1)
}
}
Alerts:
2.1
3.2
4.300000000000001
5.4
6.5
7.6
8.7
9.799999999999999
It’s rounding issues.
4.3has no exact representation in binary.How exactly numbers get stored in JavaScript is actually implementation-specific, but it is always a binary floating point.
Edit:
Looks like my information is a little outdated. The standard now specifies doubleprecision 64-bit format IEEE 754 values
Links:
offical PDF
HTML version