如何在移动设备上正确显示图像？

Question

我们拥有的背景图片是 1920x1080p，它可以在桌面浏览器上正确显示，但在移动设备上却不能（不是纵向或横向模式）。无论如何要解决这个问题？我需要多张图片还是有办法自动调整大小？这是 .css 文件。

#tf-home{
    background: url(../images/OdysseyTitleImage.jpg);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    color: #cfcfcf;
}

#tf-home .overlay{
    background: -moz-linear-gradient(top,  rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.73) 17%, rgba(0,0,0,0.66) 35%, rgba(0,0,0,0.55) 62%, rgba(0,0,0,0.4) 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(0,0,0,0.8)), color-stop(17%,rgba(0,0,0,0.73)), color-stop(35%,rgba(0,0,0,0.66)), color-stop(62%,rgba(0,0,0,0.55)), color-stop(100%,rgba(0,0,0,0.4))); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top,  rgba(0,0,0,0.8) 0%,rgba(0,0,0,0.73) 17%,rgba(0,0,0,0.66) 35%,rgba(0,0,0,0.55) 62%,rgba(0,0,0,0.4) 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top,  rgba(0,0,0,0.8) 0%,rgba(0,0,0,0.73) 17%,rgba(0,0,0,0.66) 35%,rgba(0,0,0,0.55) 62%,rgba(0,0,0,0.4) 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top,  rgba(0,0,0,0.8) 0%,rgba(0,0,0,0.73) 17%,rgba(0,0,0,0.66) 35%,rgba(0,0,0,0.55) 62%,rgba(0,0,0,0.4) 100%); /* IE10+ */
    background: linear-gradient(to bottom,  rgba(0,0,0,0.8) 0%,rgba(0,0,0,0.73) 17%,rgba(0,0,0,0.66) 35%,rgba(0,0,0,0.55) 62%,rgba(0,0,0,0.4) 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#cc000000', endColorstr='#66000000',GradientType=0 ); /* IE6-9 */
    height: 1080px;
    background-attachment: fixed;
}
.home-lead{
    color: #fff;
    padding: 10px 15px;
    background-color: rgba(51, 51, 51, 0.9);
    font-size: 21px;
}
.content{
    position: relative;
    padding: 30% 0 0;
}

这是 .html 文件

<div id="tf-home" class="text-center">
    <div class="overlay">
        <div class="content">
            <div><a href="https://www.youtube.com/watch?v=HRlP0t41wCw" class="btn tf-btn btn-default popup-video">Watch the trailer</a></div>
            <a href="#tf-game" class="fa fa-angle-down page-scroll"></a>
        </div>
    </div>
</div>

Answer 1

这可能是由#tf-home .overlay 中的height: 1080px; 引起的。它在桌面上看起来不错，因为它有足够高的空间。但是同样的高度也适用于移动设备，所以图形的面积比一般的移动设备视口要大很多。

您是否尝试过在移动设备的媒体查询中创建更合适（更小）的高度？例如。

@media (max-width: 600px) {
    #tf-home{
        background-attachment: scroll;
    }
    #tf-home .overlay {
        height: 320px;
    }
}