<!DOCTYPE HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>系好安全带,准备启航</title>
<script type="text/javascript">
//通过javascript的日期对象来得到当前的日期,并输出。
function Day(){
var mydate = new Date();
var weekday = ["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
var str = mydate.getFullYear()+"年"+(mydate.getMonth()+1)+"月"+mydate.getDate()+"日"+" "+weekday[mydate.getDay()]
document.write(str);
}
document.write(Day());
//问题2
//document.write(Day().toString() + "This is a test str!");
</script>
</head>
<body>
</body>
</html>问题1:这样输出文本的话为什么会有个undefined后缀?问题2:如果改为document.write(Day().toString());虽然可以消除undefined,但是后面的文本输出就无法显示;例如document.write(Day().toString() + "This is a test str!");结果只是输出当前的时间,没有后面的【"This is a test str!"】,这是为什么?
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