qasystem/resources/views/captcha/login.blade.php

<div class="form-group @if ($errors->first('captcha')) has-error @endif">
    <label for="captcha" class="required">验证码</label>
    <input type="text" class="form-control" id="captcha" name="captcha" autocomplete="off" required="" placeholder="请输入下方的验证码">
    @if ($errors->first('captcha'))
        <span class="help-block">{{ $errors->first('captcha') }}</span>
    @endif
    <div class="mt-10"><a href="javascript:void(0);" id="reloadCaptcha"><img src="{{ captcha_src()}}"></a></div>
</div>