Question

This has happens when I convert a large number to string in Javascript, it seems to give me a result which i do not expect:

var x=1234567890123456;

console.log(x) //1234567890123456 –equal…

console.log(x.toString()) //1234567890123456 –equal…

var x=12345678901234567;

console.log(x) // 12345678901234568 –different!

console.log(x.toString()) //12345678901234568 –different!

var x=123456789012345678;

console.log(x) //123456789012345680 –different!

console.log(x.toString()) //123456789012345680 –different!

console.log(x+””) //123456789012345680 –different!

Can anyone could tell me the reason for this, and how to deal with it?

Answer 1

The reason is the maximum of numbers in javascript (+/- 9007199254740992) without losing precision. Also see this question.