為什么把年份設(shè)置直接放在documente.write（mydate.setFullYear(1994)）; 中結(jié)果是亂的
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>獲得年份 </title>
<script type="text/javascript">
var mydate=new Date();
var myyear=mydate.getFullYear();
document.write("年份:"+myyear);
document.write(mydate.setFullYear(1994));
</script>
</head>
<body>
</body>
</html>
輸出結(jié)果為：年份2017763224290162
2017-03-10
明白了，謝謝
2017-03-10
var mydate=new Date();?
var myyear=mydate.getFullYear();
mydate.setFullYear(1994);
document.write("年份:"+myyear+"<br>");
document.write(mydate);
that's ok
2017-03-10
mydate.setFullYear(1994),修改年份，但是要輸出mydate，而不是年。