JS method to get two decimal places

1. The stupidest Way

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

2. Regular expression effect is good

<script type= "Text/javascript" >function() {    var a = "23.456322";     var  anew;     var re =/([0-9]+.[ 0-9]{2}) [0-9]*/;     = A.replace (Re, "$");    alert (anew);} </script>

3. He is more clever ...

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

4.js Reserved 2 decimal places (mandatory)

For the number of decimal places greater than 2 bits, with the above function is not a problem, but if less than 2 bits, such as: Changetwodecimal (3.1), will return 3.1, if you must need 3.10 such a format, then you need the following function:

functionChangetwodecimal_f (x) {varf_x =parsefloat (x); if(IsNaN (f_x)) {alert (' Function:changetwodecimal->parameter error '); return false; }    varf_x = Math.Round (x * 100)/100; varS_x =f_x.tostring (); varPos_decimal = S_x.indexof ('. ')); if(Pos_decimal < 0) {Pos_decimal=s_x.length; S_x+ = '. '; }     while(s_x.length <= Pos_decimal + 2) {s_x+ = ' 0 '; }    returns_x;}

JS method to get two decimal places