JavaScript Get the decimal number after the two decimal places of any float type

Use Javascript to take two decimal places after float type, and use example 22.127456 to 22.13. How to do it?

1. This method is the least recommended:

 function get(){ var s = 22.127456 + ""; var str = s.substring(0,s.indexOf(".") + 3); alert(str); }

2. Use regular expressions to get:

 function get(){ var a = "23.456322"; var aNew; var re = /([0-9]+/.[0-9]{2})[0-9]*/; aNew = a.replace(re,"$1"); alert(aNew); }

3. More advanced applications:

 function get(){ var num=22.127456; alert( Math.round(num*100)/100); }

4. The simplest and most convenient:

 function get(){ var num = new Number(13.37); num = num.toFixed(2);//2 is the number of digits after the decimal to get, it will automatically round to alert(num); }