- button 的onclick事件怎麼也不觸發。請幫忙。謝謝
-
<html>
<head>
<script language="JavaScript" type="text/javascript">
function butRemoveWed_onclick()
{
if (document.form1.theDay.options[2].text == "Wednesday")
{
document.form1.theDay.options[2]=null;
}
else
{
alert("There is no Wednesday here!");
}
}
function butAddWed_onclick()
{
if (document.form1.theDay.options[2].text != Wednesday")
{
var indexCounter;
var days=document.form1.theDay;
var lastoption=new option();
days.options[6]=lastoption;
for (indexCounter=6; indexCounter>2; indexCounter--)
{
days.options[indexCounter].text=days.options[indexCounter-1].text;
days.options[indexCounter].value=days.options[indexCounter-1].value;
}
var option=new option ("Wednesday",2);
days.options[2]=option;
}
else
{
alert("Do you want to have TWO Wednesdays?????");
}
}
</script>
</head>
<body>
<form name=form1>
<select name=theDay size=5>
<option value=0 selected>Monday
<option value=1>Tuesday
<option value=2>Wednesday
<option value=3>Thursday
<option value=4>Friday
<option value=5>Saturday
<option value=6>Sunday
</select>
<input type="button" value="Remove Wednesday" name=butRem onclick="butRemoveWed_onclick()">
<input type="button" value="Add Wednesday" name=butAd onclick="butAddWed_onclick()">
</form>
</body>
</html>
最佳回答：
function butAddWed_onclick() {
if (document.form1.theDay.options[2].text != "Wednesday")/////////////少了引號
{
var indexCounter;
var days = document.form1.theDay;
var lastoption = new Option();//////沒注意大小寫
days.options[6] = lastoption;
for (indexCounter = 6; indexCounter > 2; indexCounter--) {
days.options[indexCounter].text = days.options[indexCounter - 1].text;
days.options[indexCounter].value = days.options[indexCounter - 1].value;
}
var option = new Option("Wednesday", 2);;//////沒注意大小寫
days.options[2] = option;
}
else {
alert("Do you want to have TWO Wednesdays?????");
}
}
