Select all contents of textbox when it receives focus (JavaScript or jQuery)

Question

What is a JavaScript or jQuery solution that will select all of the contents of a textbox when the textbox receives focus?

Answer 1

$(document).ready(function() {
    $("input[type=text]").focus(function() { $(this).select(); } );
});

Answer 2

<input type="text" onfocus="this.select()" />

Answer 3

$(document).ready(function() {
  $("input[type=text]").focus().select();
});