@media查询如何工作？

时间：2017-03-20 16:35:06

标签： android css video youtube embed

我正在尝试制作响应式嵌入式YouTube视频，我不明白@media查询是如何工作的，对我来说它们不起作用..

首先，我尝试在平板电脑上缩小它，但它没有效果：/

我使用的代码：

@media only screen and (min-width:321px) and (max-width:768px) {
    .video {width: 40% !important; }
    .vid {position: absolute; top: 20%;}
}

我希望视频变小以适应标题左侧和“最后更新：”

图片： （那没起效） http://m.imgur.com/3ydAlCv http://m.imgur.com/AdOmoEv

同样在手机上，我想让youtube视频在标题下面，并将标题和视频集中在一起，但那更难......我甚至无法做出这个小东西..

所以我只想在平板电脑上调整视频大小，以便它适合“最后更新：”和标题“Overworld Roleplay”的左侧。

我的HTML 

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <!--<meta name="viewport" content="width=device-width, initial-scale=1">-->
    <meta name="viewport" content="width=device-width, user-scalable=yes">
    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
    <meta name="description" content="">
    <meta name="author" content="">
    <link rel="icon" href="../../favicon.ico">

    <title>Homepage | Overworld RP Devs</title>

    <!-- Bootstrap core CSS -->
    <link href="/css/bootstrap.min.css" rel="stylesheet">

    <!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
    <link href="/css/ie10-viewport-bug-workaround.css" rel="stylesheet">

    <!-- Custom styles for this template -->
    <link href="css/maintemplate.css" rel="stylesheet">

    <!-- Just for debugging purposes. Don't actually copy these 2 lines! -->
    <!--[if lt IE 9]><script src="../../assets/js/ie8-responsive-file-warning.js"></script><![endif]-->
    <script src="../../assets/js/ie-emulation-modes-warning.js"></script>

    <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
    <!--[if lt IE 9]>
      <script src="https://oss.maxcdn.com/html5shiv/3.7.3/html5shiv.min.js"></script>
      <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
    <![endif]-->
  </head>

  <body>

    <nav class="navbar navbar-default navbar-fixed-top">
      <div class="container">
        <div class="navbar-header">
          <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
          <a class="navbar-brand" href="/index.html">Overworld Roleplay</a>
        </div>
        <div id="navbar" class="collapse navbar-collapse">
          <ul class="nav navbar-nav navbar-right">
            <li class="active"><a href="#">Home</a></li>
            <li><a href="#about">About</a></li>
            <li><a href="#contact">Contact</a></li>
          </ul>
        </div><!--/.nav-collapse -->
      </div>
    </nav>

    <div class="front container">

      <h1 class="text-primary" id="title" >Overworld Roleplay</h1>
      <h4>Development Website</h4>

    </div><!-- /.container -->

    <!-- <div class="videoWrapperOuter">
        <div class="videoWrapperInner">
            <iframe src="//www.youtube.com/embed/C6-TWRn0k4I" 
            frameborder="0" allowfullscreen></iframe>
        </div> -->

    <div class="video container">   
        <div class="col-md-8">
            <div class="vid">
                <iframe src="//www.youtube.com/embed/ac7KhViaVqc" frameborder="0" allowfullscreen></iframe>
            </div><!--./vid -->
            <h2 class="text-info" id="last" >Last Update:</h2>
        </div><!--.col -->
    </div>

    <!-- Bootstrap core JavaScript
    ================================================== -->
    <!-- Placed at the end of the document so the pages load faster -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <script>window.jQuery || document.write('<script src="../../assets/js/vendor/jquery.min.js"><\/script>')</script>
    <script src="../../dist/js/bootstrap.min.js"></script>
    <!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
    <script src="../../assets/js/ie10-viewport-bug-workaround.js"></script>
    <script src="/js/collapse.js"></script>
    <script src="/js/transition.js"></script>
    <script src="/js/tooltip.js"></script>
    <script src="/js/tab.js"></script>
    <script src="/js/scrollspy.js"></script>
    <script src="/js/popover.js"></script>
    <script src="/js/npm.js"></script>
    <script src="/js/modal.js"></script>
    <script src="/js/dropdown.js"></script>
    <script src="/js/carrousel.js"></script>
    <script src="/js/button.js"></script>
    <script src="/js/alert.js"></script>
    <script src="/js/affix.js"></script>
  </body>
</html>

body {
  padding-top: 50px;
}

.starter-template {
  padding: 40px 15px;
  text-align: center;
}

html, body {
    background-color: black;
    background: url(/images/bg.jpg); 
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    background-repeat: no-repeat;
    /*background-position: center;*/
    height: 100%;
    margin: 0;
}

.front {
    position: absolute;
    left: 54%;
    top: 30%;
    width: 46%;
}

#title {
    font-size: 60px;
    word-wrap: normal;
}

.vid {
    position: relative;
    padding-bottom: 56.25%;
    padding-top: 30px; height: 0; overflow: hidden;
}

.vid iframe,
.vid object,
.vid embed {
    position: absolute;
    top: 27%;
    left: 3%;
    width: 77%;
    height: 68%;
    border: 0;
}

.navbar {
    background-color: rgba(0, 0, 0, 0.6);
    background: rgba(0, 0, 0, 0.6);
    border-color: rgba(0, 0, 0, 0.4);
}

.nav.navbar-nav.navbar-right li a {
    color: white;
}

.navbar-default .navbar-brand {
    color: white;
}

.navbar-nav>.active>a, .navbar-nav>.active>a:hover, .navbar-nav>.active>a:focus {
  color:black;
}

#last {
    position: absolute;
    left: 5%;
    top: 15%;
}

.video {
    position: absolute;
    left: 3%;
}

@media only screen and (min-width:321px) and (max-width:768px) {
    .video {width: 40% !important; }
    .vid {position: absolute; top: 20%;}
}

1 个答案:

答案 0 :(得分：1)

假设您的.video是<iframe>，<embed>等，请尝试

.video {
    max-width: 100%;
    height: auto; 
}

并将其放在容器（div或section）中，其样式如下：

@media (max-width: 767px) {
    .video_container {
        width: 40%;
    }
}

因此，在宽度较小的视口上，例如，小于767px的容器相对于其父容器将获得40％的宽度，而您的视频内部将仅调整。我希望你得到这种方法。你在标题中提出的问题确实有些广泛。正如其他人所指出的，附加代码永远不会伤害：）

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