Javascript decimal rounding implemented in multiple ways_Basic knowledge

Use Javascript to get the two decimal places after the float type. For example, 22.127456 is changed to 22.13. How to do it?
1. The stupidest way

Copy the code The code is as follows:

function get()
{
var s = 22.127456 "";
var str = s.substring(0,s.indexOf(".") 3);
alert(str ; >
The code is as follows:

3. He is smarter
.....




Copy code


The code is as follows:

<script> <strong>var num=22.127456; </strong> alert( Math.round(num*100)/100); <br></script>

4. Friends who know how to use new things.... .. But it requires IE5.5 to support it.

Copy code


The code is as follows:

<script> <strong>var num=22.127456; </strong>alert( num.toFixed(2)); <br></script>