请详细分析下面代码：
<#import "/decorators/includes/macros.ftl" as m>
<#assign ww = JspTaglibs["/WEB-INF/webwork.tld"] />
<#include "/template/includes/actionerrors.ftl">
<script>
xmlParse = new function(){
th
is.xmlDoc = null;
th
is.parse=function(response){
th
is.xmlDoc = response.responseXML.documentElement;
}
//取得所有节点
th
is.getRows=function(_xpath){
return th
is.xmlDoc.selectNodes(_xpath);
}
//取得单个节点
th
is.getRow=function(_xpath){
return th
is.xmlDoc.selectSingleNode(_xpath);
}
//取得单个节点的文本值
th
is.getRowValue=function(_xpath){
return th
is.xmlDoc.selectSingleNode(_xpath).text;
}
//取得属性值
th
is.getRowAttribute=function(_rowItem,attr){
var xpath="@"+attr;
return _rowItem.selectSingleNode(xpath).text;
}
}
function checkRuncardStatus(){
var url ="checkFormData.action";
var ajaxRequest = new Ajax.Request(
url,{
method: 'post',
asynchronous: 'false',
parameters: $('requestFormId').serialize(),
onComplete: function(transport){
//alert(transport.responseText);
xmlParse.parse(transport);
var status =xmlParse.getRows("/roots/status");
var flag=status[0].getAttribute("value");
//alert(xmlParse.getRowValue("/roots/status"));
if(flag=="nodraft"){
alert("Th
is runcard had been
issued, don't click the button of back off in the browser.\n\n Please apply new application
!");
}
}});
}
function checkPageToPreview(){
var form = document.forms['updateRequestForm'];
var hold
StepNo=form.elements["requestForm.hold
StepNo"];
var erc
StepNo=form.elements["requestForm.erc
StepNo"];
var hold
StepNoMes=form.elements["requestForm.hold
StepNoMes"];
var erc
StepNoMes=form.elements["requestForm.erc
StepNoMes"];
clearHoldLotInfo(hold
StepNo);
clearCompleteLotInfo(erc
StepNo);
/* remove the Lot Type check.
var lotType="${requestForm.lotType?default('')?if_ex
ists}";
var runcardCategory=$F("requestForm.ercCategory");
if(lotType=="P" | lotType=="R" | lotType=="M" |lotType=="B" |lotType=="E1" |lotType=="E2"|lotType=="E3" |lotType=="E9"){
if(runcardCategory
!="Input the STR Number" && runcardCategory
!="STR" && runcardCategory
!="MSTR" ) {
alert("Because the lotType
is "+lotType+ ". Please select 'the For STR/MSTR lots(Pls input the effective STR or MSTR number)' in RunCard Category, and input the STR#
! ");
$("requestForm.ercCategory").focus();
return false;
}
}*/
if (typeof form.elements["requestForm.lotId"]
!= "undefined"){
var element = form.elements["requestForm.lotId"].value;
if (element==""){
alert("The Lot field can not be null");
form.elements["requestForm.lotId"].focus();
return false;
}
}
if (typeof form.elements["requestForm.ercRunMode"]
!= "undefined"){
if (
!form["requestForm.ercRunMode"][0].checked&&
!form["requestForm.ercRunMode"][1].checked){
alert("Please choose the Runcard's Follow mode after Runcard completed
!");
return false;
}
}
if (typeof form.elements["requestForm.needCheck"]
!= "undefined"){
if (
!form["requestForm.needCheck"][0].checked&&
!form["requestForm.needCheck"][1].checked){
alert("Please choose the check RunCard's Product Id method
!");
return false;
}
}
if (typeof form.elements["requestForm.hold
StepNo"]
!= "undefined"){
var element = form.elements["requestForm.hold
StepNo"].value;
if (element==""){
alert("The Hold
Step No field can not be null");
form.elements["requestForm.hold
StepNo"].focus();
return false;
}
var elementMes = form.elements["requestForm.hold
StepNoMes"].value;
if (elementMes==null || element
!=elementMes){
alert("Please click [go] to get MES information.");
form.elements["requestForm.hold
StepNo"].focus();
return false;
}
}
if (typeof form.elements["requestForm.hold
StepNo"]
!= "undefined"){
var element = form.elements["requestForm.hold
StepNo"].value;
if (element==""){
alert("The Hold
Step No field can not be null");
form.elements["requestForm.hold
StepNo"].focus();
return false;
}
}
if (typeof form.elements["requestForm.relatedModlue"]
!= "undefined"){
var element = form.elements["requestForm.relatedModlue"].value;
if (element==""){
alert("You must select related module manager to sign runcard");
form.elements["requestForm.relatedModlue"].focus();
return false;
}
}
if (typeof form.elements["requestForm.E1Mgr"]
!= "undefined"){
var element = form.elements["requestForm.E1Mgr"].value;
if (element==""){
alert("You must select E1 manager to sign runcard");
form.elements["requestForm.E1Mgr"].focus();
return false;
}
}
if (typeof form.elements["requestForm.mfgMgr"]
!= "undefined"){
var element = form.elements["requestForm.mfgMgr"].value;
if (element==""){
alert("You must select MFG manager to sign runcard");
form.elements["requestForm.mfgMgr"].focus();
return false;
}
}
if (typeof form.elements["requestForm.ercCategory"]
!= "undefined"){
var element = form.elements["requestForm.ercCategory"].value;
if (element=="Please Select"){
alert("You must select Runcard Category
!");
form.elements["requestForm.ercCategory"].focus();
return false;
}
}
if (typeof form.elements["requestForm.purpose"]
!= "undefined"){
var element = form.elements["requestForm.purpose"].value;
if(element.
length>150){
alert("Remark最多150个字符
!");
element.focus();
return false;
}
if (element==""){
alert("Purpose can not be null
!");
form.elements["requestForm.purpose"].focus();
return false;
}
}
if (typeof form.elements["requestForm.strEnNo"]
!= "undefined"){
var element = form.elements["requestForm.strEnNo"].value;
if (element==""){
if(form.elements["requestForm.ercCategory"].value=="For Customer Request")
alert("EN#. can not be null
!");
else
alert("STR NO#. can not be null
!");
form.elements["requestForm.strEnNo"].focus();
return false;
}
}
if (typeof form.elements["requestForm.ercContamination"]
!= "undefined"){
var element = form.elements["requestForm.ercContamination"].value;
if (element=="Please Select"){
alert("Please select Lot Contamination Flag
!");
form.elements["requestForm.ercContamination"].focus();
return false;
}
}
if (typeof form.elements["requestForm.erc
StepNo"]
!= "undefined"){
var element = form.elements["requestForm.erc
StepNo"].value;
if (element==""){
alert("
Step No#. can not be null
!");
form.elements["requestForm.erc
StepNo"].focus();
return false;
}
var elementMes = form.elements["requestForm.erc
StepNoMes"].value;
if (elementMes==null || element
!=elementMes){
alert("Please click [go] to get MES information.");
form.elements["requestForm.erc
StepNo"].focus();
return false;
}
}
if (typeof form.elements["requestForm.ercEngineerNo"]
!= "undefined"){
var element = form.elements["requestForm.ercEngineerNo"].value;
if (element==""){
alert("Engineer can not be null
!");
form.elements["requestForm.ercEngineerNo"].focus();
return false;
}
}
if (typeof form.elements["requestForm.ercEngineerTel"]
!= "undefined"){
var element = form.elements["requestForm.ercEngineerTel"].value;
if (element==""){
alert("Engineer Tel. can not be null
!");
form.elements["requestForm.ercEngineerTel"].focus();
return false;
}
}
<#if requestForm.formType=="Normal" || requestForm.formType=="Auto Reposition
Step">
var wHeight=400;
var wWidth=620;
var wTop=(screen.height-wHeight)/2;
var wLeft=(screen.width-wWidth)/2;
var str=window.showModalDialog("
stepCompareRule.action?requestFormId=${requestForm.id}","","dialogTop:"+wTop+"px; dialogLeft:"+wLeft+"px;dialogheight :"+wHeight+"px; dialogwidth :"+wWidth+"px; edge: Ra
ised; center: Yes; help: No; resizable: No; status: No; scroll:Yes;");
if(str=="null" || str==undefined || str
!="Yes"){
return false;
}
</#if>
form.action="updateRequestForm.action";
form.submit();
}
</script>
<#if requestForm.status
!="DRAFT"><div><font color="red">Th
is runcard had been
issued.If you want to apply the case,please click the new application.</font></div></#if>
<#if requestForm.haveQtime?has_content><div><font color="red">Th
is runcard information had been stored the MES.If you want to delete th
is runcard,please click the button(Prview and Cancel Runcard ).If you want to submit it,please click the button (Preview and Continue Runcard)</font></div></#if>
<#if (requestForm.match)?default("")=="N"><div>Compare with MES Result: <font color="red">Not match MES Info</font></div><#elseif (requestForm.match)?default("")=="Y">
<div>Compare with MES Result: <font color="red">Match MES Info</font></div><#else><div>Compare with MES Result: <font color="red">${requestForm.match?default("")}</font></div>
</#if>
<div class="app">
<h3>e-Runcard Request Form(${requestForm.formType?if_ex
ists})</h3>
<form name="updateRequestForm" action="updateRequestForm.action" namespace="/user" method="post">
<@ww.hidden name="'requestFormId'" value="${requestForm.id}"/>
<@ww.hidden name="'requestForm.match'" value="'No Compar
ison'"/>
<@ww.hidden name="'requestForm.compareResultComment'" value="''"/>
<@ww.hidden name="'requestForm.hold
StepNoMes'"/>
<@ww.hidden name="'requestForm.erc
StepNoMes'"/>
<input type="hidden" name="paginationSupport.startIndex" value="0"/>
<input type="hidden" name="paginationSupport.countOnEachPage" value="10"/>
<table border="0" cellspacing="1" cellpadding="8" width="100%">
<tr class="b">
<td>RunCard No.:</td>
<td>${requestForm.caseNo?if_ex
ists}</td>
<td>Status:</td>
<td><font color="red">${requestForm.status?if_ex
ists}</font></td>
</tr>
<tr class="b">
<td>Applicant:</td>
<td><@m.directoryLink requestForm.applicant?if_ex
ists/> </td>
<td>Organization:</td>
<td>${requestForm.applicantOrg?if_ex
ists}</td>
</tr>
<tr class="b">
<td>Submit Date:</td>
<td>${requestForm.submitDate?if_ex
ists}</td>
<td>Effective Date:</td>
<td>${requestForm.effectiveDate?if_ex
ists}</td>
</tr>
<#switch requestForm.formType>
<#case "Auto Reposition
Step">
<#include "includeLotInfo.ftl"/>
<#include "includeSignInfo.ftl"/>
<#include "includeErcHeaderInfo_reposition.ftl"/>
<#include "includeErcCompleteInfo.ftl"/>
</table>
<#break>
<#default>
<#include "includeLotInfo.ftl"/>
<#include "includeSignInfo.ftl"/>
<#include "includeErcHeaderInfo.ftl"/>
<#include "includeErcCompleteInfo.ftl"/>
</table>
<table border="0" cellspacing="1" cellpadding="8" width="100%">
<#assign showWGRbtn="true"/>
<#include "include
StepInfo.ftl"/>
</table>
</#switch>
<#if requestForm.lotCategory?ex
ists>
<table border="0" cellspacing="1" cellpadding="8" width="100%">
<tr><td><center><font color="#FF0000"><b>
!!! Special lot, category
is ${requestForm.lotCategory}, pls take care
!!!</b></font></center></td></tr>
</table>
</#if>
<hr/>
<table width="100%">
<tr>
<td class="center">
<
!--input type="button" onclick="window.open('../
stepForm/printRuncard.action?requestFormId=${requestForm.id}','','resizable=yes,scrollbars=yes,width=800,height=600')" value="Print"/-->
<input type="button" onclick="checkPageToPreview()" value="Preview"/>
</td>
</tr>
</table>
</form>
</div>
本文介绍了一种计算向量长度的方法，使用length函数可以方便地获取向量的长度。对于非空数组，该函数等价于求SIZE的最大值；而对于空数组，则返回0。
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