這樣寫為什么不行？
<!DOCTYPE? HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>系好安全帶,準備啟航</title>
<script type="text/javascript">
??? var myDate = new Date();
??? var day;
??? switch(myDate.getDay()){
??????? case 0:
??????????? day = "星期天";
??????????? break;
??????? case 1:
??????????? day = "星期一";
??????????? break;
??????? case 2:
??????????? day = "星期二";
??????? break;
??????? case 3:
??????????? day = "星期三";
??????? break;
??????? case 4:
??????????? day = "星期四";
??????? break;
??????? case 5:
??????????? day = "星期五";
??????? break;
??????? default:
??????????? day = "星期六";
??? }
??? document.write(myDate.getFullYear()+"年"+(myDate.getMonth()+1)+"月"+myDate.getDate()+"日 "+day+"--班級總分為：");
? //通過javascript的日期對象來得到當前的日期，并輸出。
?
?
?
? var sum = 0;
? //成績是一長竄的字符串不好處理，找規律后分割放到數組里更好操作哦
? var scoreStr = "小明:87;小花:81;小紅:97;小天:76;小張:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76";
?var scoreArray = scoreStr.split(";");
?//alert(scoreArray);
?for(var i=0;i<scoreArray.length;i++){
??? var num = scoreArray[i].split(":");?
?}
? //從數組中將成績撮出來，然后求和取整，并輸出。
??? document.write(sum);
</script>
</head>
<body>
</body>
</html>
2015-07-29
你的num 都不是數據，是字符串，
2015-07-18
<!DOCTYPE??HTML> <html?> <head> <meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8"?/> <title>系好安全帶,準備啟航</title> <script?type="text/javascript"> ????var?myDate?=?new?Date(); ????var?day; ????switch(myDate.getDay()){ ????????case?0: ????????????day?=?"星期天"; ????????????break; ????????case?1: ????????????day?=?"星期一"; ????????????break; ????????case?2: ????????????day?=?"星期二"; ????????break; ????????case?3: ????????????day?=?"星期三"; ????????break; ????????case?4: ????????????day?=?"星期四"; ????????break; ????????case?5: ????????????day?=?"星期五"; ????????break; ????????default: ????????????day?=?"星期六"; ????} ????document.write(myDate.getFullYear()+"年"+(myDate.getMonth()+1)+"月"+myDate.getDate()+"日?"+day+"--班級總分為："); ??//通過javascript的日期對象來得到當前的日期，并輸出。 ?? ? ?? ??var?sum?=?0; ??//成績是一長竄的字符串不好處理，找規律后分割放到數組里更好操作哦 ??var?scoreStr?=?"小明:87;小花:81;小紅:97;小天:76;小張:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76"; ?var?scoreArray?=?scoreStr.split(";"); ?//alert(scoreArray); ?for(var?i=0;i<scoreArray.length;i++){ ????var?num?=?scoreArray[i].split(":");? ?} ??//從數組中將成績撮出來，然后求和取整，并輸出。 ????document.write(sum); </script> </head> <body> </body> </html>