<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> 追加和删除表格 </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<SCRIPT LANGUAGE="JavaScript">
<!--
function checkLang(){
var otxt = document.getElementById("content");
var osel1 = document.getElementById("xx");
var osel2 = document.getElementById("yy");
if(osel1.options[osel1.selectedIndex].text == osel2.options[osel2.selectedIndex].text){
alert("不能重复!")
}
if(osel1.options[osel1.selectedIndex].text=="---" || osel2.options[osel2.selectedIndex].text=="---"){
alert("不能为空");
otxt.blur();
osel1.focus();
}
} //-->
</SCRIPT>
</HEAD> <BODY>
<textarea name="content" id="content" cols="40" rows="20" onfocus="checkLang()"></textarea></td>
<select id="xx" name="xx" >
<option value="0">---</option>
<option value="1">abc</option>
<option value="2">xyz</option>
</select>
<select id="yy" name="yy" >
<option value="0">---</option>
<option value="1">abc</option>
<option value="2">xyz</option>
</select> </BODY>
</HTML>
document.getElementById("xx").focus();
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> 追加和删除表格 </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<SCRIPT LANGUAGE="JavaScript">
<!--
function checkLang(){
var otxt = document.getElementById("content");
var osel1 = document.getElementById("xx");
var osel2 = document.getElementById("yy");
if(osel1.options[osel1.selectedIndex].text == osel2.options[osel2.selectedIndex].text){
alert("不能重复!")
}
if(osel1.options[osel1.selectedIndex].text=="---" || osel2.options[osel2.selectedIndex].text=="---"){
alert("不能为空");
otxt.blur();
osel1.focus();
}
} //-->
</SCRIPT>
</HEAD> <BODY>
<textarea name="content" id="content" cols="40" rows="20" onfocus="checkLang()"></textarea></td>
<select id="xx" name="xx" >
<option value="0">---</option>
<option value="1">abc</option>
<option value="2">xyz</option>
</select>
<select id="yy" name="yy" >
<option value="0">---</option>
<option value="1">abc</option>
<option value="2">xyz</option>
</select> </BODY>
</HTML>我不明白的是,为什么要两个select?