text: var $btn, 
      i = 9,
      html = '<input type="button" value="同意">',
      timer;
  
  $(function() {
    $('div.box').html(html);
    $btn = $('input[type="button"]');
    $btn.val('同意 (' + i + ' s)');
    $btn.attr('disabled', 'disabled');
    $btn.css({
      'width': '130px',
      'height': '70px',
      'font-size': '1.3em'
    });
    
    timer = window.setInterval(function() {
      $btn.val('同意 (' + i-- + ' s)');
      if(i === -1) {
        window.clearInterval(timer);
        $btn.val('同意');
        $btn.removeAttr('disabled');
      }
    }, 1000);
  
    $btn.click(function() {
      alert('就知道你会同意的！');
    });
  });
  