js css add decimal; point as to input code example

Example 1: To set the text of button using Jquery

BY LOVE
  $('#btnid').text('Show');

Example 2: how to change input value in javascript using class

// Find the input element with a class of "bar" that is a direct child of a form with a name attribute of "foo"
document.querySelector("form[name='foo'] > input.bar").value = "hehe works"