get a number from a sting javascript code example

Example 1: javascript extract number from string

// Html: <span id="foo">280ms</span>

var text = $('#foo').text();
var number = parseInt(text, 10);
alert(number);

// parseInt('ms120'.replace(/[^0-9\.]/g, ''), 10);

Example 2: javascript convert a number in string

const num = 123; //> type number 123
const str = num.toString(); //> type string "123"