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我有 2 个数组和一个变量。我可以将一个项目推送到一个变量中，然后再次单击，将其添加到一个数组中。但是，我有另一个按钮，可以将该数组中的一个项目移回变量中，然后将变量移动到另一个数组中。我的代码适用于第一部分，但是我的函数现在确实加载了第二部分，请问有什么帮助吗？

这部分似乎不起作用

<INPUT type=button value="Back" onClick='txtPop.value = popBackStack();showStack(theList);pushForStack(curUrl);
showStack2(theList2);'>

整个代码如下：

<HTML>
<HEAD>
<TITLE>Stacking up!</TITLE>
<SCRIPT>

var backStack = new Array(); 
var forStack = new Array();
var curUrl = document.getElementById("txtPop");

function pushStack(newVal) {
backStack.push(curUrl);
curUrl = newVal;
}

function pushForStack(newVal) {
CurUrl = newVal;
forstack.push(curUrl);
}

function popBackStack() {
var popVal = backStack.pop();  
if (popVal == undefined)
  return "Nothing left!";
else
return popVal
}

function popForStack() {
var popVal = forStack.pop();
if (popVal == undefined)
  return "Enter a new URL";
else
return popVal;
}

function showStack(theSelect){
theSelect.options.length = 0;
for (var i = 0; i < backStack.length; i++){
  var theOption = new Option(backStack[i]);
  theSelect.options[theSelect.options.length] = theOption;
}
}

function showStack2(theSelect){
theSelect.options.length = 0;
for (var i = 0; i < forStack.length; i++){
  var theOption = new Option(forStack[i]);
  theSelect.options[theSelect.options.length] = theOption;
}
}
 </SCRIPT>


</HEAD>
<BODY>
<FORM>
<table width="104%" height="364" border="5" cellpadding="3" cellspacing="3">
<tr>
<th width="30%" height="78" scope="col"><p>
<INPUT type=button value="Back" onClick='txtPop.value =     popBackStack();showStack(theList);pushForStack(curUrl);
showStack2(theList2);'></p></th>
<th width="46%" scope="col"><p>
<center>
<INPUT type=text name=txtPush>
<INPUT type=button value="Push"   onClick='pushStack(txtPush.value);txtPush.value="";txtPop.value = curUrl;   showStack(theList);'>
</center>
</p></th>
<th width="24%" scope="col"><p><INPUT type=button value="Forward" onClick="txtPop.value      = popBackStack();showStack2(theList2);"></p></th>
</tr>
<tr>
<td><p><center>
<SELECT name="theList" size=12>
</SELECT>
</center></p></td>
<td><p><center><INPUT type=textki name=txtPop size=25></center></p></td>
<td><center>
<SELECT name="theList2" size=12>
</SELECT>
</center></td>
</tr>
</table>
</FORM>
<p>&nbsp;</p>
</BODY>
</HTML>
4

1 回答 1

1

尝试将 curUrl 变成一个新数组并从 backStack 弹出到 curUrl，然后将 curUrl 弹出到 forStack。

curUrl = new Array ()
于 2013-01-13T23:44:49.573 回答