---
title: H5竖屏提示
date: 2018/08/21
tag: ['CSS', 'JavaScript']
---

在做 h5 展示页面的时候 考虑到许多 css 样式在横屏会出现布局错乱, 为防止提示用户横屏显示


### demo 介绍

使用 `onorientationchange` 事件 + `animation` 动画;

![竖屏提示.png](https://i.loli.net/2021/02/21/vT83KhgfMdViSm2.png)

### html

```html
<div id="tip">
  <i class="icon"></i>
  <p>为了更好的体验，请使用竖屏浏览</p>
</div>
```

### css

```css
#tip {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 999;
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: rgba(0, 0, 0, 1);
}

.icon {
  display: inline-block;
  width: 67px;
  height: 109px;
  background-image: url('data:image/png;base64,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');
  transform: rotate(90deg);
  animation: rotation infinite 1.5s ease-in-out;
  background-size: 67px 109px;
  margin-bottom: 2em;
}

#tip p {
  color: white;
  font-size: 2em;
}

@keyframes rotation {
  10% {
    transform: rotate(90deg);
  }
  50% {
    transform: rotate(0);
  }
  60% {
    transform: rotate(0);
  }
  90% {
    transform: rotate(90deg);
  }
  100% {
    transform: rotate(90deg);
  }
}
```

### JavaScript

```javascript
(function screenStatus() {
  const element = document.querySelector('#tip');
  element.style.visibility = 'hidden';
  const status =
    'onorientationchange' in window ? 'orientationchange' : 'resize';
  window.addEventListener(status, e => {
    if (window.orientation === 180 || window.orientation === 0) {
      element.style.visibility = 'hidden';
    }
    if (window.orientation === 90 || window.orientation === -90) {
      element.style.visibility = 'visible';
    }
  });
})();
```