learning_jquery/Chapter 4/04.js

$(document).ready(function () {
  "use strict";

  var $speech = $('div.speech');
  var defaultSize = $speech.css('fontSize');
  $('#switcher button').click(function () {
    var num = parseFloat($speech.css('fontSize'));
    switch (this.id) {
      case 'switcher-large':
        num *= 1.4;
        break;
      case 'switcher-small':
        num /= 1.4;
        break;
      default:
        num = parseFloat(defaultSize);
    }
    $speech.css('fontSize', num + 'px');
  });

  var $firstPara = $('p').eq(1);
  $firstPara.hide();
  $('a.more').click(function (event) {
    event.preventDefault();
    $firstPara.animate({
      opacity: 'toggle',
      height: 'toggle'
    }, 'slow');
    var $link = $(this);
    if ($link.text() == 'read more') {
      $link.text('read less');
    } else {
      $link.text('read more');
    }
  });
});