收藏获取不到网页元素
想获取输入框元素，但是提示获取不到。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>博畅ERP</title>
<link rel="shortcut icon" href=" /favicon.ico" />
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
<LINK href="cssBin/logo.css" type="text/css" rel="stylesheet">
<script src="calendar/Calendar.js"></script>
<LINK media="all" href="css/login2.css" type="text/css" rel="stylesheet">
<script language="javascript" type="text/javascript">
function offsetDiv()
{
var bodyHeight= screen.height;
var bodyWidth= screen.width;
var div=document.getElementById("div_back");
div.style.marginTop=(bodyHeight-660)/2;
/*div.style.marginLeft=(bodyWidth-800)/2;*/
var VersionId= document.getElementById("VersionId");
VersionId.style.marginTop=bodyHeight/2.5;
VersionId.style.marginLeft=bodyWidth/3;
VersionId.style.width=150;
VersionId.style.fontSize=14;
VersionId.style.fontSize = 14;
f2()
}
</script>
</HEAD>
<body onLoad="offsetDiv()">
<form name="form1" method="post" action="login.aspx" id="form1">
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUKLTYyODM0MzAxOQ9kFgICAQ9kFgJmDxAPFgYeDURhdGFUZXh0RmllbGQFC0NvbXBhbnlOYW1lHg5EYXRhVmFsdWVGaWVsZAUJQ29tcGFueUlkHgtfIURhdGFCb3VuZGdkEBUBE+aenOiUrOi+vjLlj7fkupHku5MVAQgyMDE3MDgwMRQrAwFnZGQYAQUeX19Db250cm9sc1JlcXVpcmVQb3N0QmFja0tleV9fFgIFDEltYWdlQnV0dG9uMQUMSW1hZ2VCdXR0b24yaLc6RPEhnhu61k+fW8GerYvNCWU=" />
<input type="hidden" name="__VIEWSTATEGENERATOR" id="__VIEWSTATEGENERATOR" value="C2EE9ABB" />
<input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWBgKI+MajAgLk+IvmDQKl1bKzCQKd+7qdDgLSwpnTCALSwtXkAnQaWHmDFcFZgQAAeiw6R6StOg3/" />
<div id="div_back">
<div id="div_all" style="WIDTH: 246px">
<div id="div_up" style="WIDTH: 246px">
<div id="div_left">
<!-- <div id="div_name1" style="TEXT-ALIGN: left; WIDTH: 60px"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">帐套:</span></div>-->
<div id="div_name2" style="TEXT-ALIGN: left; WIDTH: 62px"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">用户名:</span></div>
<div id="div_name3" style="TEXT-ALIGN: left; WIDTH: 60px"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">密码:</span></div>
</div>
<div id="div_right" style="WIDTH: 180px">
<!-- <div id="div_box1" style="TEXT-ALIGN: left"><select name="cmbCompany" id="cmbCompany" style="height:18px;width:180px;">
<option value="20170801">果蔬达2号云仓</option>
</select></div>-->
<div id="div_box2" style="TEXT-ALIGN: left"><input name="txtUserName" type="text" id="txtUserName" style="height:20px;width:180px;" /></div>
<div id="div_box3" style="HEIGHT: 13px"><input name="txtPwd" type="password" id="txtPwd" style="height:20px;width:180px;" /></div>
</div>
</div>
<div id="div_down" style="WIDTH: 332px">
<div id="div_botton1" style="TEXT-ALIGN: left"><input type="image" name="ImageButton1" id="ImageButton1" src="images/botton1.gif" border="0" style="height:28px;width:83px;" /></div>
<div id="div_botton2"><input type="image" name="ImageButton2" id="ImageButton2" src="images/botton2.gif" border="0" style="height:28px;width:83px;" /></div>
</div>
</div>
<div id="VersionId"><font color="#666699">Version: 8.15.0701</font></div>
</div>
</form>
<script>
var mainfrm = top.window.frames["main"];
if (mainfrm != null){
top.window.location.replace("login.aspx");
}
function f2()
{
//document.forms[0].txtUserName.focus();
document.getElementById("txtUserName").focus();
}
</script>
</body>
</HTML>
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