jQuery Mobile 页面加载显示加载器及 document.ready 与 window.onload 执行顺序解析

<html xmlns="http://www.w3.org/1999/xhtml">
<head >
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>验证加载顺序</title>
<script src="../Scripts/jquery-1.7.1.js"></script>
<link href="../Scripts/Mobile/jquery.mobile-1.4.0.min.css" rel="stylesheet" />
<script src="../Scripts/Mobile/jquery.mobile-1.4.0.min.js"></script>
<script>
alert("DOM还没加载"); 
window.onload = function () { 
alert('onload，图片加载完'); 
}
$(document).ready(function () {
alert('ready，dom加载完'); 
}) 
</script>
</head>
<body >
<form id="form1" runat="server"> 
<img src="http://images.aviary.com/imagesv5/feather_default.jpg" />
<img src="http://car0.autoimg.cn/car/upload/2015/1/8/v_20150108092921264345010.jpg" />
</form>
</body>
</html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head >
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>验证加载顺序</title>
<script src="../Scripts/jquery-1.7.1.js"></script>
<link href="../Scripts/Mobile/jquery.mobile-1.4.0.min.css" rel="stylesheet" />
<script src="../Scripts/Mobile/jquery.mobile-1.4.0.min.js"></script>
<script>
setTimeout('showLoader()', 100);//这里要延迟一下，直接调用无法显示加载器
//显示加载器.for jQuery Mobile 1.2.0 
function showLoader() {
$.mobile.loading('show', {
text: '正在登陆...', //加载器中显示的文字 
textVisible: true, //是否显示文字 
theme: 'a', //加载器主题样式a-e 
textonly: false, //是否只显示文字 
html: "" //要显示的html内容，如图片等 
});
}
//隐藏加载器.for jQuery Mobile 1.2.0 
function hideLoader() {
$.mobile.loading('hide');
}
window.onload = function () { 
hideLoader();
//setTimeout('hideLoader()', 5000);//延迟5秒，模拟图片和多媒体加载耗时
}
$(document).ready(function () { 
//setTimeout('hideLoader()', 5000);//延迟5秒，模拟页面请求数据耗时，ajax异步请求等放在这里
})
</script>
</head>
<body >
<form id="form1" runat="server"> 
<img src="http://images.aviary.com/imagesv5/feather_default.jpg" />
<img src="http://car0.autoimg.cn/car/upload/2015/1/8/v_20150108092921264345010.jpg" />
</form>
</body>
</html>