Строка к номеру JS
var myInt = parseInt("10.256"); //10
var myFloat = parseFloat("10.256"); //10.256
Grepper
var myInt = parseInt("10.256"); //10
var myFloat = parseFloat("10.256"); //10.256new Number(valeur);
var a = new Number('123'); // a === 123 donnera false
var b = Number('123'); // b === 123 donnera true
a instanceof Number; // donnera true
b instanceof Number; // donnera false isNaN("234") //false
isNaN("sdf") true