<html><head>
<script language="javascript" type="text/javascript">
var ID = "";
var myweekday = ""; var year = ""; var mydate = ""; var mymonth = ""; var myyear = ""; mydate = new Date(); myweekday = mydate.getDay(); mymonth = mydate.getMonth() + 1; myday = mydate.getDate(); myyear = mydate.getYear(); if (myweekday == 0) weekday = " 星期日 "; else if (myweekday == 1) weekday = " 星期一 "; else if (myweekday == 2) weekday = " 星期二 "; else if (myweekday == 3) weekday = " 星期三 "; else if (myweekday == 4) weekday = " 星期四 "; else if (myweekday == 5) weekday = " 星期五 "; else if (myweekday == 6) weekday = " 星期六 "; document.write(myyear + "年" + mymonth + "月" + myday + "日 " + weekday + " "); function yearadd() {
var y = document.getElementById("ttbyear").value;
y++;
}
function monthadd() {
var m = document.getElementById("ttbmonth").value;
if (m < 12)
m++;
}
function dayadd() {
var y = document.getElementById("ttbyear").value;
var m = document.getElementById("ttbmonth").value;
var d = document.getElementById("ttbday").value;
if (m == 1 || m == 3 || m == 5 || m == 1 || m == 7 || m == 8 || m == 10 || m == 12) {
if
(d < 31) d++;
else
alert(m月只有31天);
}
else if (m == 2) {
if (y / 400 == 0) {
if
(d < 29) d++;
else
alert(m月只有29天);
}
else {
if
(d < 28) d++;
else
alert(m月只有28天);
}
}
else {
if
(d < 30) d++;
else
alert(m月只有30天);
}
}
function add() {
if (document.activeElement.id == "ttbyear")
yearadd();
else if (document.activeElement.id == "ttbmonth")
monthadd();
else if (document.activeElement.id == "ttbday")
dayadd();
}
</script>
</head><body >
<div style="width:100%;text-align:center">
<br/>
<br/>现在时间为:<br/>
<br/>
<input type="button" id="btadd" value="+" onclick="add()"/>
<input type="text" id="ttbyear" value="2010" />
年
<input type="text" id="ttbmonth" value="9" />
月
<input type="text" id="ttbday" value="25" />
日
<input type="button" id="btcut" value="-"/>
</div>
</body>
</html>
<script language="javascript" type="text/javascript">
var ID = "";
var myweekday = ""; var year = ""; var mydate = ""; var mymonth = ""; var myyear = ""; mydate = new Date(); myweekday = mydate.getDay(); mymonth = mydate.getMonth() + 1; myday = mydate.getDate(); myyear = mydate.getYear(); if (myweekday == 0) weekday = " 星期日 "; else if (myweekday == 1) weekday = " 星期一 "; else if (myweekday == 2) weekday = " 星期二 "; else if (myweekday == 3) weekday = " 星期三 "; else if (myweekday == 4) weekday = " 星期四 "; else if (myweekday == 5) weekday = " 星期五 "; else if (myweekday == 6) weekday = " 星期六 "; document.write(myyear + "年" + mymonth + "月" + myday + "日 " + weekday + " "); function yearadd() {
var y = document.getElementById("ttbyear").value;
y++;
}
function monthadd() {
var m = document.getElementById("ttbmonth").value;
if (m < 12)
m++;
}
function dayadd() {
var y = document.getElementById("ttbyear").value;
var m = document.getElementById("ttbmonth").value;
var d = document.getElementById("ttbday").value;
if (m == 1 || m == 3 || m == 5 || m == 1 || m == 7 || m == 8 || m == 10 || m == 12) {
if
(d < 31) d++;
else
alert(m月只有31天);
}
else if (m == 2) {
if (y / 400 == 0) {
if
(d < 29) d++;
else
alert(m月只有29天);
}
else {
if
(d < 28) d++;
else
alert(m月只有28天);
}
}
else {
if
(d < 30) d++;
else
alert(m月只有30天);
}
}
function add() {
if (document.activeElement.id == "ttbyear")
yearadd();
else if (document.activeElement.id == "ttbmonth")
monthadd();
else if (document.activeElement.id == "ttbday")
dayadd();
}
</script>
</head><body >
<div style="width:100%;text-align:center">
<br/>
<br/>现在时间为:<br/>
<br/>
<input type="button" id="btadd" value="+" onclick="add()"/>
<input type="text" id="ttbyear" value="2010" />
年
<input type="text" id="ttbmonth" value="9" />
月
<input type="text" id="ttbday" value="25" />
日
<input type="button" id="btcut" value="-"/>
</div>
</body>
</html>
所以不可能出现ttbyear、ttbmonth和ttbday,也就根本进不了if语句里面