// 2
var s = "12.34567"
// 12.34
console.log(s.replace(/\.\d{2}/, "*")) // 12*567
console.log(s.replace(/\.[^\d]{2}\d+/, "*")) // 12.34567
// 2
var s = "12.34567"
// 12.34
console.log(s.replace(/\.\d{2}/, "*")) // 12*567
console.log(s.replace(/\.[^\d]{2}\d+/, "*")) // 12.34567 var s = '12.34567';
var num = Number (s.match (/ ^ d + (?: .d {0jue 2})? /)
alert (num); / / 12.34
rounding:
var s = 12.34567
alert (s.toFixed (2)); / / 12.35
/^(\d+\.\d{2})(\d+)$/.test(12.34567)
true
RegExp.$2
"567" 
1. No regularization
new Number('12.34567').toFixed(2);(+'12.34567').toFixed(2);var s='12.34567';
s.substring(0,s.indexOf(".")+3);II. Use regularization
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