关于JS显示星期的问题

Question

var date = 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 mynum=date.getDay(1)

  var timeStr = ''; 

  timeStr = date.getFullYear() + "年" ;  

  timeStr += date.getMonth() + 1 +"月";   

  timeStr += date.getDate()+"日";  

  timeStr += weekday[mydate.getDay(1)];

  document.write(timeStr);

为什么这样子显示不了星期一

var date = 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 mynum=date.getDay(1)

  var timeStr = ''; 

  timeStr = date.getFullYear() + "年" ;  

  timeStr += date.getMonth() + 1 +"月";   

  timeStr += date.getDate()+"日";  

  timeStr += weekday[mynum];

  document.write(timeStr);

这样子可以显示星期一了，为什么呢

另外我年月日没写就自动显示了，求解

Answer 1

mydate没有定义就使用

Answer 2

你mydate没定义啊，之前定义的是date=new Date()；mydate改成date就好了；另外年月日不是写了date.getFullYear+"年"这些吗；timeStr += XXX这个是自相加，timerStr=timeStr+XXX，所以年月日就会显示了

Answer 3

  timeStr += weekday[mydate.getDay(1)]; 与 timeStr += weekday[mynum]; 有区别！将timeStr += weekday[mydate.getDay(1)]; 改成date.getDay(1)就可以了！