Several examples of methods to get the number of decimal places javascript

function getnum() { var num = 22.123456; var result = num.substring(0,s.indexOf(".")+3); alert(result); }

function getnum() { var num = 22.123456; var aNew; var re = /([0-9]+\.[0-9]{2})[0-9]*/; aNew = num.replace(re,"$1"); alert(aNew); }

function getnum() { var num=22.123456; alert( Math.round(num*100)/100); }

alert(num.toFixed(2));