<SELECT name=ab onchange="chsel();">
<OPTION value="a">a</OPTION>
<OPTION value="b">b</OPTION>
</SELECT>
<SELECT name=ab2>
<OPTION value="a1">a1</OPTION>
<OPTION value="a2">a2</OPTION>
<OPTION value="a3">a3</OPTION>
</SELECT> <script language="javascript">
var selects=new Array(
new Array(
new Option("a1","a1"),
new Option("a2","a2"),
new Option("a3","a3")),
new Array(
new Option("b1","b1"),
new Option("b2","b2"),
new Option("b3","b3")));
function chsel()
{
ab2.options.length=0;
if(ab.value=="a")
k=0;
if(ab.value=="b")
k=1;
for(var i=0;i<selects[k].length;i++)
ab2.add(selects[k][i]);
}
</script>更多项的你改一下就行了。
<OPTION value="a">a</OPTION>
<OPTION value="b">b</OPTION>
</SELECT>
<SELECT name=ab2>
<OPTION value="a1">a1</OPTION>
<OPTION value="a2">a2</OPTION>
<OPTION value="a3">a3</OPTION>
</SELECT> <script language="javascript">
var selects=new Array(
new Array(
new Option("a1","a1"),
new Option("a2","a2"),
new Option("a3","a3")),
new Array(
new Option("b1","b1"),
new Option("b2","b2"),
new Option("b3","b3")));
function chsel()
{
ab2.options.length=0;
if(ab.value=="a")
k=0;
if(ab.value=="b")
k=1;
for(var i=0;i<selects[k].length;i++)
ab2.add(selects[k][i]);
}
</script>更多项的你改一下就行了。
解决方案 »
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