bootstrap 如何创建错误提示

.span4.alert(默认样式).alert alert-successs.alert alert-error.alert alert-info

nbsp;html&gt;<meta>    <title>bootstrap警告错误</title>    <link>        <script></script>    <script></script>            <div>        <h2>警告错误</h2>        <div>        <div>            <div>                <a>×</a>                <strong>                    Warning                </strong>这里是警告提示信息            </div>            <div>                <a>×</a>                <strong>                    Success                </strong>这里是成功提示信息            </div>            <div>                <a>×</a>                <strong>                    Info                </strong>这里是信息提示信息            </div>        </div>    </div></div>