Andrew 程式設計

$(document).ready(function () {
  $('[placeholder]').focus(function () {
    var input = $(this);
    if (input.val() == input.attr('placeholder')) {
      input.val('');
      input.removeClass('placeholder');
    }
  }).blur(function () {
    var input = $(this);
    if (input.val() == '' || input.val() == input.attr('placeholder')) {
      input.addClass('placeholder');
      input.val(input.attr('placeholder'));
    }
  }).blur();

  $('[placeholder]').parents('form').submit(function () {
    $(this).find('[placeholder]').each(function () {
      var input = $(this);
      if (input.val() == input.attr('placeholder')) {
        input.val('');
      }
    })
  });
});

::-webkit-input-placeholder {
  color: red;
}
:-moz-placeholder {
  color: red;
}
.placeholder {
  color: #ccc;
}