var mydate=new Date()
<script type="text/javascript">
? var mydate=new Date();
? var weekday=["星期一","星期二","星期三","星期四","星期五","星期六","星期日"];
? document.write("今天是：" + mydate.getDay());
</script>
請問一下，var weekday=["星期一","星期二","星期三","星期四","星期五","星期六","星期日"];這個有什么作用？因為我試過把他刪除了對結果是沒有影響的，這里為什么要寫他呀？
2017-01-08
你輸出的結果肯定是數字吧？這里你想要輸出星期幾的話就要用到weekday這個數組啊，因為getDay()方法返回的是數值，所以你想知道星期幾得創建weekday這樣的數組。你在最后的結果中沒有調用數組，當然不會有效果。應該這樣，前面加個weekday。
<script?type="text/javascript"> ??var?mydate=new?Date(); ??var?weekday=["星期一","星期二","星期三","星期四","星期五","星期六","星期日"]; ??document.write("今天是："?+?weekday[mydate.getDay()]); </script>