Multiple methods to implement javascript Decimals

Javascript decimal rounding is often used at work. Today, this article provides some common tips. If you need to know about it, you can refer to using Javascript to take the float type and the last two digits, for example, 22.127456 to 22.13, how to do it?
1. the most stupid way

The Code is as follows:

Function get ()
{
Var s = 22.127456 + "";
Var str = s. substring (0, s. indexOf (".") + 3 );
Alert (str );
}

2. The regular expression works well.

The Code is as follows: