                        課程
                    
                        /前端開發
                        
                            /JavaScript
                        
                        /JavaScript進階篇

哪里出錯了，求解

<!DOCTYPE?HTML>
<html>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8"?/>
<title>JS基礎</title>
<script?type="text/javascript">
??var?a,b,sum;
??var??a??=?5;
??var??b??=?100%7;??
??sum?=?a?>?b?;
???document.write(?"我認為?a?的值是:"?+?a?+?"?b的值是:"?+?b?+?"sum?的值是:"?+sum+"<br/>");
????sum?=?(?(++a)?+?3?)?/?(2?-?(--b)?)?*?3;??
?????document.write("sum的值是："+27);
??????document.write("答案是："+sum+"<br/>");
??????/*var?array=new?Array(10);
??????array=[1,2,3,4,5,6,7,8,9,10,11];*/
??????var?array=[1,2,3,4,5];
???????document.write("數組的長度為"+array.length+"<br>");
??????for(i=0;i<5;i++)
??????{
??????	document.write((array[i])+"<br/>");
??????}???
??????var?myarr=new?Array();
?????for(var?i=0;i<3;i++)
{??????myarr[i]=new?Array();
????for(var?n=0;n<6;n++)
????{
???????myarr[i][n]=i*n;
????}
}
document.write(myarr);
var?arr=['*','**','***'];
?????alert("該數組的長度為："+arr.length);
?????for(var?j=0;j<3;j++);
?????{
?????	document.write(arr[j]);
?????}
var?myweek=3;
switch(myweek)
{
?case?1:
?case?2:
?document.write("學習理念知識");
?break;
?case?3:
?case?4:
?document.write("到企業實踐");
?break;
?case?5:
?document.write("總結經驗");
?break;
?case?6:
?case?7:
?document.write("周六、日休息和娛樂");
?default;
}
??</script>
??</head>
</html>