需求：利用html5实现类似微信的手机摇一摇功能，并实现微博转发

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难点：

1.监控摇动状态

2.播放摇动后音频

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难点一，通过html5的DeviceMotionEvent实现，核心代码如下

 var SHAKE_THRESHOLD = 3000;    
    var last_update = 0;    
    var x=y=z=last_x=last_y=last_z=0;  

function init(){
if (window.DeviceMotionEvent) { 
	window.addEventListener('devicemotion',deviceMotionHandler, false);  
	} else{
		
	alert('not support mobile event');
	}
	}

    function deviceMotionHandler(eventData) {    
	
    var acceleration =eventData.accelerationIncludingGravity;  
	 
    var curTime = new Date().getTime(); 
    if ((curTime - last_update)> 100) {  
		var diffTime = curTime -last_update;    
		last_update = curTime;        
		x = acceleration.x; 
		y = acceleration.y;   
		z = acceleration.z;   
		var speed = Math.abs(x +y + z - last_x - last_y - last_z) / diffTime * 10000;   
		
		if (speed > SHAKE_THRESHOLD) {    
	            alert("摇动了");
		}    
		last_x = x;    
		last_y = y;    
		last_z = z;    
		}    
     

难点二：代码

function deviceMotionHandler(eventData) {    
	
    var acceleration =eventData.accelerationIncludingGravity;  
	 
    var curTime = new Date().getTime(); 
    if ((curTime - last_update)> 100) {  
		var diffTime = curTime -last_update;    
		last_update = curTime;        
		x = acceleration.x; 
		y = acceleration.y;   
		z = acceleration.z;   
		var speed = Math.abs(x +y + z - last_x - last_y - last_z) / diffTime * 10000;   
		
		if (speed > SHAKE_THRESHOLD) {    
	media.setAttribute("src","http://192.168.1.106/weixin_yaoyiyao.mp3");
	media.load();
	 media.play();
		}    
		last_x = x;    
		last_y = y;    
		last_z = z;    
		}    
     
    }  


 <audio style="display:hide" id="musicBox" preload="metadata"  controls
 src="http://192.168.1.106/weixin_yaoyiyao.mp3"
		autoplay="false"
     >
   </audio> 

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此两种方式为目前唯一方式

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但只能适用少数浏览器

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ios平台，safari，可以监控摇动，但无法通过js直接播放音频

android平台，android os 自带浏览器无法监控摇动，但是第三方浏览器，opera，chrome均能监控摇动，也可以通过js直接播放音频

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总之目前，用手机实现摇一摇功能，不能完全满足要求

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