為什么結(jié)果是NaN
<!DOCTYPE ?HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>系好安全帶,準(zhǔn)備啟航</title>
<script type="text/javascript">
var date=new Date() ;
?var year=date.getFullYear();
?var month=date.getMonth()+1;
?var day=date.getDate();
? var weekday=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
? var week=date.getDay();
? document.write(year+"年"+month+"月"+day+"日"+" "+weekday[week])
?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 score=new Array();
??
? score1=scoreStr.split(';');
? var sum=0;
for(var i=0;i<score1.length;i++){
? ??
var score2=new Array();
? ? score2=score1[i].split(':');
? ? sum+=parseInt(score2[i]);
}
document.write("<br><br>總分?jǐn)?shù)："+sum);
document.write("<br><br>平均分："+Math.round(sum/(score1.length)));
</script>
</head>
<body>
</body>
</html>
2015-08-04
錯在這一步sum+=parseInt(score2[i]);
因為score2=score1[i].split(':');獲取出來的結(jié)果是score2=["小明", "87"]，score2=["小花", "81"]，獲取不到具體的數(shù)值，所以把sum+=parseInt(score2[i]);改為sum+=parseInt(score2[1]);就可以了