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<form id="loginFrm" role="form" method="post" novalidate="novalidate">
<input type="text" class="form-control" name="username" id="username" placeholder="电子邮箱">
<div class="form-group">
<input type="text" class="form-control" name="username" id="username" placeholder="电子邮箱">
<i class="icon icon-user"></i>
<!-- 错误信息 popover -->
<div class="err-popover-out">
<div class="err-popover">
<div class="tri-right"></div>
<div class="tri-right-in"></div>
<div class="err-popover-content"></div>
</div>
</div>
<!-- 错误信息 popover end -->
</div>
<div class="form-group">
<input type="password" class="form-control" id="password" name="password" placeholder="密码">
<i class="icon icon-lock"></i>
<!-- 错误信息 popover -->
<div class="err-popover-out">
<div class="err-popover">
<div class="tri-right"></div>
<div class="tri-right-in"></div>
<div class="err-popover-content"></div>
</div>
</div>
<!-- 错误信息 popover end -->
</div>
<div class="form-group clearfix">
<div class="form-left">
<input type="text" class="form-control" id="ccap-text" name="ccap" placeholder="验证码">
<i class="icon icon-shield"></i>
</div>
<div class="form-right">
<img class="ccap" src="/getccap?0006851273356005549">
</div>
<!-- 错误信息 popover -->
<div class="err-popover-out">
<div class="err-popover">
<div class="tri-right"></div>
<div class="tri-right-in"></div>
<div class="err-popover-content"></div>
</div>
</div>
<!-- 错误信息 popover end -->
</div>
<div class="checkbox">
<label class="a" for="rem_me">
<input type="checkbox" id="rem_me" class="auto">记住我
</label>
<a href="/retrieve" class="pull-right a">忘记密码？</a>
</div>
<button type="submit" id="submit" class="btn btn-blue form-control"><span>登录</span></button>
<div class="checkbox no-padding">
<a href="/reactive" class="a text-center">重发激活邮件</a>
</div>
</form>
(function($) { $.fn.placeholder = function() { if (!Modernizr.input.placeholder) { $(‘[placeholder]‘).focus(function() { var input = $(this); if (input.attr(‘type‘) !== ‘password‘ && input.attr(‘placeholder‘) != 0) { if (input.val() == input.attr(‘placeholder‘)) { input.val(‘‘); input.removeClass(‘placeholder‘); } } }).blur(function() { var input = $(this); if (input.attr(‘type‘) !== ‘password‘ && input.attr(‘placeholder‘) != 0) { if (input.val() === ‘‘ || input.val() === input.attr(‘placeholder‘)) { input.addClass(‘placeholder‘); input.val(input.attr(‘placeholder‘)); } } }).blur().parents(‘form‘).submit(function() { $(this).find(‘[placeholder]‘).each(function() { var input = $(this); if(input.attr(‘type‘) !== ‘password‘ && input.attr(‘placeholder‘) != 0){ if (input.val() == input.attr(‘placeholder‘)) { input.val(‘‘); } } }); }); } }; })(jQuery);
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原文地址：http://www.cnblogs.com/niunaimidou/p/4310268.html
