奇怪的是，如果你直接 放在一个 新页面上展示，是可以的，换成页面上 jq 插入 的 embed object iframe 就不显示，embed和object连请求 都不发
<div id="pdfView" class="easyui-window" style="width:800px;height:600px">
<div class="panel-heading" style="text-align: left">
<label style="width:100px">流水号：</label><input id="cus_no" type="text" style="width:150px" >
<a style="width:80px;" class="easyui-linkbutton c1" onclick="SaveCustomflowNo()">保存</a>
</div>
<div id="embed_div" class="panel-collapse collapse">
<embed id="pdf_embed" style="width:100%;height:100%" />
</div>
</div>
</div>
<script>
function onDblClickRow(index, row) {
$("#embed_div embed").remove();
//这里无论是 object embed 或iframe（ifram 会回发到后台）都 不显示pdf
var pdfurl = "/Delgt_Attaches/GetStream?id=" + row.ID;
var pdfhtm ="<object id='pdf_obj' src= '"+pdfurl +"' ></object>" ; //不会回发
pdfhtm = "<iframe id='pdf_ifm' src= '"+pdfurl +"' />";//会回发到后台，但不显示pdf
pdfhtm = "<embed id='pdf_embed' src= '"+pdfurl +"' />";//不会回发
$("#embed_div").append(pdfhtm);
//$("body").append(pdfhtm);//可以展示
$('#pdfView').window('center');
}
</script>
新页面html
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>委托附件查看</title>
<link href="/Scripts/easyui/themes/metro/easyui.css" rel="stylesheet">
<link href="/Scripts/easyui/themes/color.css" rel="stylesheet">
<script src="/Scripts/jquery-2.1.1.js"></script>
<script src="/Scripts/easyui/jquery.easyui.min.js"></script>
</head>
<body>
<div id="pdfView" class="easyui-window" style="width:100%;height:100%">
<div class="panel panel-default">
<div class="panel-heading" style="text-align: left">
<label style="width:100px">关务流水号：</label>
<input id="cus_no" type="text" style="width:150px">
<a style="width:80px;" class="easyui-linkbutton c1" onclick="SaveCustomflowNo()">保存</a>
</div>
<div id="pdfembed_div" class="panel-collapse collapse">
@*<embed src="GetStream?ftpFilePath=@(ViewBag.ftpFilePath??"")" style="width:100%;height:90%" type="application/pdf">*@
<object id="pdfObj" type="application/pdf" src="GetStream?ftpFilePath=@(ViewBag.ftpFilePath??"")" style="width:100%;height:90%"></object>
</div>
</div>
</div>
</body>
</html>