H5横竖屏适配代码，强制横屏

 1、强制横屏代码，检测用户屏幕方向，竖屏时提示用户将屏幕翻转

<style>
    @media all and (orientation: portrait) {
        html, body {
            position: relative;
            overflow: hidden;
            width: 100%;
            height: 100%;
            padding: 0;
            margin: 0;
        }

        html::before {
            content: "";
            position: fixed;
            top: 0;
            left: 0;
            height: 100%;
            width: 100%;
            background: #333;
            z-index: 99999;
        }

        html::after {
            content: "\4E3A\4E86\66F4\597D\7684\4F53\9A8C\FF0C\8BF7\5C06\624B\673A\6A2A\8FC7\6765";
            position: absolute;
            top: 30%;
            left: -15%;
            height: 30px;
            width: 100%;
            margin-top: 30px;
            z-index: 99999;
            text-align: center;
            font-size: 16px;
            color: #fff;
        }

        body::before {
            content: "";
            position: absolute;
            z-index: 99999;
            height: 200px;
            width: 100px;
            left: 35%;
            top: 30%;
            margin: -160px 0 0 -50px;
            color: #fff;
            background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHQAAAB2CAYAAAAZUrcsAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAyFpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuNS1jMDE0IDc5LjE1MTQ4MSwgMjAxMy8wMy8xMy0xMjowOToxNSAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wTU09Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9tbS8iIHhtbG5zOnN0UmVmPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvc1R5cGUvUmVzb3VyY2VSZWYjIiB4bWxuczp4bXA9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC8iIHhtcE1NOkRvY3VtZW50SUQ9InhtcC5kaWQ6MDAwMjcwNkVEQzczMTFFNjlFMDFGQTEzNkM3N0JBMTMiIHhtcE1NOkluc3RhbmNlSUQ9InhtcC5paWQ6MDAwMjcwNkREQzczMTFFNjlFMDFGQTEzNkM3N0JBMTMiIHhtcDpDcmVhdG9yVG9vbD0iQWRvYmUgUGhvdG9zaG9wIENDIChXaW5kb3dzKSI+IDx4bXBNTTpEZXJpdmVkRnJvbSBzdFJlZjppbnN0YW5jZUlEPSJ4bXAuaWlkOjQ0NzhCMTlBREM1ODExRTZCNTdFRjQ0Q0I1QzRCODZBIiBzdFJlZjpkb2N1bWVudElEPSJ4bXAuZGlkOjQ0NzhCMTlCREM1ODExRTZCNTdFRjQ0Q0I1QzRCODZBIi8+IDwvcmRmOkRlc2NyaXB0aW9uPiA8L3JkZjpSREY+IDwveDp4bXBtZXRhPiA8P3hwYWNrZXQgZW5kPSJyIj8+J30rNQAACRRJREFUeNrsXQlsFVUUfW2hpexQlhYJi0IQJaCgoLgAsohIkFWIURQFNaBgBKMRgZAY1KgYlRIiQVkEo4IBEVAxBsQgyFIkLAHRgFCkgJhCgVqg33syd+R1nPb/+Z3fzpvek5y0s/6Ze+Zt9933XlIkElExIpN4HfF6YmviJWUGkonFxP3Eg8QjxL9VSJEUg6CNiD2Jw4mdiRnEBmwkI96RiJc8xdxCXEz8sSoKOpH4PLFlCN99PfE94ldVQVBkq9nEe1yO5RPPEFMMeccIp9LGxHSX4/P5wy306fc6EjsQtxF/DYKg/YnLOFu1AQEXEncwc4nVDBO0FbEr8V7iUMc5OcRBxGM+/B4SwniuY3xD/IH4GZfdFfC2JKjGbsSiSElkE5s7zjOdvYnfOt5zF7FmOe+bGXHHKeIyYqdEv5u+0Yx4UnuIAuLgkAnp5GyH4VeU836NiPOJOZHSsZTYuSIEXeX44b4hF9Pmy473Hu/DPWsR2xOnEX9xEfU8cSYxKVGCDnT84NgqIqbNFdq7nyM29Pn+Q4hfugi7ye/Uav+zWvuRrVVMTLAl8axmg2cT9DsjiHscoqJoG+anoK2JhdoP9K6CgoIzNBtsSeDvpBLfcUmtvuSKyMPHUGX3Q670HiK2J172UFG+kViXWMRNGjeX4UCP94zVA4SmwXKf2pBo0mzm9nUht8UT2dQYRlxArKfte5z4UXmbLdnaV/K+h6+hPnGR4ytbR2zhOK9vJLFo6lPKSSHu0+47vAJyhXbE3Y73GVeeeyazb9bGUQ/fAhwNo12cEp8Tq2v7EunEP++jT/mKI0W2qwA3wAHifQ6P0gfEXvHeEN6eJtr2iRiv6018QPPE4IGyiHU463qQuNTlujziVr4mOU6jw33Xg1gjAQb+R/s/tYI8WbnsYv2e2Jb3IVHc7DGB/SdolrZ9Lsbrumj/b2cR5xAn8L7OpQi62cXt5hVp3A3WIkFdbfrHU1GAy3EU8WcuwzPYx9w/HkGLHduxIE/7H4Z9kXh7Kcd1dGM/cXGcvmBUvGpzl17YsJM4hrv2FPucR2vbMVeK9HbRiBgL3wbEvFIqKReJbbRzeyWwQnSB2NjHSore+J9eSc2nL7RnyGVbe6oUxQP0+I906fkv5K/skLYvkd1s6dx8CRPGanZtRpziNcuNFxu4rHyE+/+OExcRd7nU5F7xsb9R/1AKPZT7puAMd7zP4O1xxLd5f8Ky3LAyCFmuXaSdiMcVmawEQQSy3Hna9uh4qumCYGEZ1+rtZuAtLuc8QVxJvEYEDR6clbuD3Ma3dbrfcbwp8Q128OTYbVavlaJO7KoqUuaEcSr2Kv3FX/35AD4fOkfQKTLE4a1DRGJ3/r+r45qP1VW3bYbd9vcqKFx+rxmaAvARrgmYoCncAhjD23i+h7hlAOixw8h2EbmI2OKniX20Y49xKvWc5RYZnKWdDWCukqSXfyzaRnU1fHa31ibN5ATYlJs1NuD3XRJvO1Q3SD67q4KMauySxN/LAXw+PNOTXF6+qZWN65Tl80aKRXxvPz52K6dguzcrl1OrL46Fnco9EDtoOK1KdhEGEW8R/+ByEWKlcvn5qLLG5PTTzmurXfeU0+FQHkFTDRCznkE1eQRjFxA/UVYEiGLP22ntHF3MBZyCpR0aYKzlbHWvts+tZwm+8oniWDADKE8HKGuUXGl4mHhBBDUHKE/vIq5yOTZLWVEfSgQ1C6gBDybO1vYh1U6NVq0XBBuTuQ09mWu1ZUJSqBmYqSzn/G4RNFyVJSWCVjGIoCKoQAQViKACEVTAguqiRgtaTjLwY0j28LxebBHYl9XnI0qLcr4+4qu+Ae8HUewBtRkxiFpX+7+miYLC9YeobIyFRBR6NE/ET8S5LGyOAe+Hd3pVWVEA6N2PFmW/UFldU7juOxMFjWXyRoEIKhBBBSKoIH5BEZyEWJfmXBO8LKarsEorKnKHldW5faS8giJ2BeM/7yDWEvtWKiAsIukRCfipV0ExAGYqp0pB8IDgawwIXheLoJi8N1tsFnhEWKt5ZQn6kjJ3MFJVBWKNZrsJivn4Vot9jMQAO/u1BUXNFbOBNRHbGImTylpTp8B2Vk8RMY0GtHvOTqGYmQsRZVk+3Rxj/uEQTxE7lwlMPYfBvoN9uh9GfrdBw7WHj2IqbvzuEL1itpVfwIDgrshy7/b5IWuKTpVmq54QtJXYNTRo4ZwAWWA2spJ9Lj8F/iGemcCbS9Rf8AB/QE/iTcRnlLdpeJJQy5UO0eAAU6RjurdNvL1PWU6fWTFeH5EUGiz8qYlpY6OXG4igwQJmCrvN2RTxcgMZwR0sIIgA8yqgBwUTN8KLNE0ENRvwyy7hWm51rxdLlhtcVI/nIhE0ZBBBQwYpQ4OHPdx8qcHt0obsZEgWQc3EJGWtg2YDy15i5tN0yXLDAU+ePBE0eHBOW5smgkotVyCCCkLTbPmNiZXzOogJzU2hGP2E9UUwHwMWK+2orMntD4oZzRMUVedByppU4oq2b72yhhoeFlOaJSgWe9lQyjGsWjBXTGmWoJuiHM8RU5olaLQV42WIvmGC3hnleDcxpVmCjlLWGEQ3oPkySUxplqA4bzlxgrICmTAmA3MEYi4GrCEiwdoGOhbQfTOHOF1Z/XWYvLGlmNBcQW00UTI42PgsVyCCCuKEcwpYLLwbcye3hKAEDzdwHQUd3YjN7eAl4YmgwcO7ypqA2V5mGsKmiaDmIl3FGBAmZahUigQiqEAEFYigAhFUBBUYKqhMshgepEDQi2KH0CAfgh4RO4QGxyFovtghNDgNQXf5fNNisWul2WofBPV7WcVLolOl2eprTFGO6VMwyVFHn266HzdWMhFyNFwg9ie29+l+CNbrbq8KMZS4QmxsNIYQV+rrtmCihl5iFyOxRlnr7pRYiAcB09v4r8AcHFPWGnUnnIICmAlyrSq50LoguMjjlLnd3uG2mB2ClBYTu4i9Ag0scI/lQH/Xd5a23CRiWl5Q1opLdcR2gcIZ4uvKGsXwP7dttAVhWxH7EEcqa0ar2ixwkpKpzRMN28aI0y0gHiAuZb/B0VIvinHJ5muVFR+ayZWmZCUeoUTDtvFxrvDsVdZkJWXiXwEGAB5thUjn4vqyAAAAAElFTkSuQmCC");
            background-repeat: no-repeat;
            background-position: center center;
            background-size: 100px auto;
        }
    }

</style>

2、自动横屏，当手机竖屏时，内容横屏，引导用户自己将手机横屏；

首先现在要适配的页面外层包裹一个div ,id设置wrapper，再讲下面代码复制过去即可

  var detectOrient = function () {
    var width = document.documentElement.clientWidth
    var height = document.documentElement.clientHeight
    var $wrapper = document.getElementById("wrapper")

    style = "";
    if (width >= height) { // 横屏
      style += "width:" + width + "px;";
      style += "height:" + height + "px;";
      style += "-webkit-transform: rotate(0); transform: rotate(0);";
      style += "-webkit-transform-origin: 0 0;";
      style += "transform-origin: 0 0;";
    }
    else { // 竖屏
      style += "width:" + height + "px;";
      style += "height:" + width + "px;";

      style += "-webkit-transform: rotate(90deg); transform: rotate(90deg);";
      style += "-webkit-transform-origin: " + width / 2 + "px " + width / 2 + "px;";
      style += "transform-origin: " + width / 2 + "px " + width / 2 + "px;";

    }
    $wrapper.style.cssText = style;
  }
  window.onresize = detectOrient;
  detectOrient();