js how to convert to number code example

Example 1: string to int javascript

var text = '42px';
var integer = parseInt(text, 10);
// returns 42

Example 2: string to number javascript

new 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