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麻煩幫忙看看哪里錯(cuò)了，求的數(shù)值顯示不出來(lái)，顯示的日期也有問(wèn)題QAQ

<!DOCTYPE ?HTML>

<html >

<head>

<title>系好安全帶,準(zhǔn)備啟航</title>

var mydate=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"];

document.write(mydate.getFullYear()+"年"+(mydate.getMonth()+1)+"月"+mydate.getDay()+"日"+" "+weekday[mydate.getDay()]);

?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 myarr=scoreStr.split(";");

var sum=0;

for(var i=0,i<myarr.length,i++){

? ? var score=parseInt(myarr[i].substring("3,5"));

? ? sum+=score;

}

document.write("——班級(jí)總分為："+sum);

document.write(" 班級(jí)平均分為："+Math.round(sum/myarr.length));

</script>

</head>

<body>

</body>

</html>

喵閣下

2017-03-15

源自：JavaScript進(jìn)階篇 7-23

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2017-03-15

顯示不出來(lái)正確結(jié)果主要有以下幾個(gè)錯(cuò)誤造成：

for循環(huán)所跟括號(hào)內(nèi)是；而不是，所以顯示不出結(jié)果;
獲取具體某日的函數(shù)是mydate.getDate()而不是mydate.getDay()；
修改之后即可運(yùn)行正確結(jié)果：
<!DOCTYPE ?HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>系好安全帶,準(zhǔn)備啟航</title>
<script type="text/javascript">
var mydate=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"];
document.write(mydate.getFullYear()+"年"+(mydate.getMonth()+1)+"月"+mydate.getDate()+"日"+weekday[mydate.getDay()]);
?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 myarr=scoreStr.split(";");
var sum=0;
for(var i=0;i<myarr.length;i++){
? ? var score=parseInt(myarr[i].substring(3,5));
? ? sum+=score;
}
document.write("——班級(jí)總分為："+sum);
document.write(" 班級(jí)平均分為："+Math.round(sum/myarr.length));
</script>
</head>
<body>
</body>
</html>