h5写的指南针(DeviceOrientation )，调用手机罗盘,可以转动

柔光的暖阳◎ 2022-05-19 04:08 501阅读 0赞

相信这个demo有很多人写过的，简单的不说了。本例的demo非常简短，还配了个漂亮了图片(图是在某图库网下载的，只用于开发技术学习，禁用于商业)；没什么好介绍的，可以直接复制代码使用，下面贴个效果图

![70][]

下面贴代码

<!DOCTYPE html>
    <html>
    	<head>
    		<meta charset="UTF-8">
    		<title></title>
    		<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
    		<script type="text/javascript" src="http://xxiaoyuan.top/jquery-1.9.1.js" ></script>
    		<style type="text/css">
    			*{
    				padding: 0;
    				margin: 0 auto;
    			}
    			body{
    				background-color: #333;
    			}
    			.compass{
    				position: relative;
    			}
    			.compass img{
    				width: 100%;
    			}
    			.compass .pa{
    				position: absolute;
    				top: 0;
    				left: 0;
    				z-index: -1;
    			}
    				.compass .pa_p {
    				    color: #e46f19;
    				    font-size: 40px;
    				    top: 100%;
    				    left: 50%;
    				    transform: translateX(-50%);
    				    z-index: 1;
    				}
    			.box{
    				width: 90%;
    				margin: 20% auto;
    
    			}
    		</style>
    	</head>
    
    	<body>
    		<div class="box">
    			<div class="compass">
    				<img src="./img/a0.png">
    				<img class="pa" src="./img/a2.png" id="compass">
    				<img class="pa" src="./img/a3.png">
    				<div class="pa pa_p"><span id="alpha"></span>°</div>
    			</div>
    		</div>
    		
    	</body>
    	<script>	
    		var alpha = ""
    		var ua = navigator.userAgent.toLowerCase();
    		if(/android/.test(ua)) {
    			window.addEventListener('deviceorientationabsolute', DeviceOrientationHandler, false);
    			function DeviceOrientationHandler(event) {
    				document.getElementById("alpha").innerHTML = Math.round(360 - event.alpha);
    				$('#compass').css('transform','rotate(-'+Math.round(360 - event.alpha)+'deg)')		  
    			}
    		} else {
    			window.addEventListener('deviceorientation', DeviceOrientationHandler, false);
    			function DeviceOrientationHandler(event) {				
    				document.getElementById("alpha").innerHTML = event.webkitCompassHeading;	 
    				$('#compass').css('transform','rotate(-'+event.webkitCompassHeading+'deg)')		
    			}
    		}
    	</script>
    </html>

### 手机扫描可以演示demo： ###

### ![70 1][] ###

[70]: /images/20220519/578b2e9a2538467485baeddfdd948eaf.png
[70 1]: /images/20220519/0e09535a250c44458ea7bdfc8a616b97.png