整体演示:
<!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=1.0">
<title>Document</title>
<style>
/* 竖屏样式 */
@media all and (orientation: portrait) {
body div {
width: 200px;
height: 500px;
background-color: pink;
}
}
/* 横屏样式 */
@media all and (orientation: landscape) {
body div {
width: 500px;
height: 200px;
background-color: orangered;
}
}
</style>
</head>
<body>
<div >这个是大屏幕</div>
</body>
</html>
<script>
console.log('window:',window.orientation);
console.log('window:',window.orientationchange);
window.addEventListener("onorientationchange"in window ? "orientationchange": "resize", function() {
//判断window.orientation === 180||===0代表竖屏
if (window.orientation === 180 ||window.orientation=== 0){
console.log('竖屏状态!');
//竖屏情况下删除横屏样式
document.body.classList.remove("landscape");
};
//判断window.orientation === 90||===-90代表横屏
if (window.orientation === 90 ||window.orientation=== -90){
console.log('横屏状态!');
//竖屏情况下添加横屏样式
document.body.classList.add("landscape");
}
}, false);
// window.addEventListener("orientationchange", function () {
// if (window.orientation === 90 || window.orientation === -90) {
//console.log('横屏状态!');
//document.body.classList.add("landscape");
// } else {
// console.log('竖屏状态!');
//document.body.classList.remove("landscape");
// }
// });
</script>
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可以使用JavaScript的`window.orientation`属性来判断当前屏幕的方向,其中0表示竖屏,90表示向左横屏,-90表示向右横屏。根据不同的方向,可以动态地修改CSS样式,以实现不同的布局效果。具体实现步骤如下:
1. 在CSS中定义针对横屏的样式,例如:
```
@media screen and (orientation: landscape) {
/* 横屏样式 */
.container {
width: 100%;
height: 100%;
display: flex;
justify-content: center;
align-items: center;
}
}
```
2. 在JavaScript中监听`window.orientation`属性的变化,根据不同的值来添加或移除对应的CSS类,例如:
```
window.addEventListener("orientationchange", function() {
if (window.orientation === 90 || window.orientation === -90) {
document.body.classList.add("landscape");
} else {
document.body.classList.remove("landscape");
}
});
```
在以上代码中,当屏幕为横屏时,会给`<body>`元素添加`landscape`类,从而触发CSS中定义的横屏样式。当屏幕为竖屏时,则会移除该类,恢复默认样式。
需要注意的是,由于不同浏览器对`orientationchange`事件的支持可能不同,因此建议在事件处理函数中加入对`resize`事件的监听,以便在浏览器窗口大小发生变化时也能正确地更新样式。
---------------------------------------------------------------------------------------------------------------------------
强制横屏
<body><div id="app"><h1>我是一个测试网页</h1></div></body>
<script>function crossFun(ele) {var width = document.documentElement.clientWidth;var height = document.documentElement.clientHeight;//第一次进来 判断是不是横屏if (width < height) {ele.style.width = height + 'px';ele.style.height = width + 'px';ele.style.top = (height - width) / 2 + 'px';ele.style.left = 0 - (height - width) / 2 + 'px';ele.style.transform = 'rotate(90deg)';ele.style.transformOrign = '50% 50%';ele.style.position = 'relative';}//设备旋转或者窗口变化时候进行 横竖屏处理在来回切换的时候回出现BUG 使用定时器解决var evt = "onorientationchange" in window ? "orientationchange" : "resize";window.addEventListener(evt, function () {setTimeout(function () {var width = document.documentElement.clientWidth;var height = document.documentElement.clientHeight;if (width > height) {ele.style.width = width + 'px';ele.style.height = height + 'px';ele.style.top = 0;ele.style.left = 0;ele.style.transform = 'none';ele.style.transformOrign = '50% 50%';ele.style.position = 'relative';} else {ele.style.width = height + 'px';ele.style.height = width + 'px';ele.style.top = (height - width) / 2 + 'px';ele.style.left = 0 - (height - width) / 2 + 'px';ele.style.transform = 'rotate(90deg)';ele.style.transformOrign = '50% 50%';ele.style.position = 'relative';}}, 100);}, false);}crossFun(document.getElementById('app')); //注意 方法里面用的是原生的方法 传入的DOM应该用原生的方式获取 或者对原方法进行修改即可</script>
-------------------------------------------------------------------------------------------------------------------------------
html {/*用于 获取 屏幕的可视宽高*/width: 100%;height: 100%;overflow: hidden;}body {/*让 body 初始 width 和 height 就 等于 页面可视区域的 宽高*//* position: fixed; */left: 0;top: 0;width: 100%;height: 100%;}@media screen and (orientation:portrait) {/*竖屏样式*/#box {transform-origin: 0 0;transform: rotateZ(90deg) translateY(-100%);}}
// 横屏(function () {function resize() {var body = document.getElementsByTagName('body')[0];var html = document.getElementsByTagName('html')[0];var width = html.clientWidth;var height = html.clientHeight;var max = width > height ? width : height;var min = width > height ? height : width;body.style.width = max + "px";body.style.height = min + "px";}resize();window.addEventListener("resize", resize)})();