代码来源：http://www.lanrenzhijia.com/js/css3/3206.html
<html lang="en"><head>
<meta charset="UTF-8">
<meta content="width=device-width, initial-scale=1,maximum-scale=1,maximum-scale=1, user-scalable=no" name="viewport">
<title>懒人原生touch事件，计算滑动距离</title>
<style>
*{margin:0;padding:0;}
#demo{width:100%;height:500px;float:left;}
</style>
</head>
<body>
<div +moveLength);
})
})();
</script>
</body></html>