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源自:7-23 编程练习

我觉得我写的也没错,可是输出平均分是82,不是81

<script type="text/javascript">

//通过javascript的日期对象来得到当前的日期,并输出。

var one = new Date();

var two = ["星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"];


//成绩是一长窜的字符串不好处理,找规律后分割放到数组里更好操作哦

var scoreStr = "小明:87;小花:81;小红:97;小天:76;小张:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76";

var $one = scoreStr.substring(3, 5);

var $two = scoreStr.substring(9, 11);

var $three = scoreStr.substring(15, 17);

var $four = scoreStr.substring(21, 23);

var $five = scoreStr.substring(27, 29);

var $six = scoreStr.substring(33, 35);

var $seven = scoreStr.substring(39, 41);

var $eight = scoreStr.substring(45, 47);

var $nine = scoreStr.substring(51, 53);

var $ten = scoreStr.substring(57, 59);

var three = [$one, $two, $three, $four, $five, $six, $seven, $eight, $nine, $ten];


//从数组中将成绩撮出来,然后求和取整,并输出。

var sum = 0;

for(var i = 0; i < three.length; i++) {

sum = sum + parseInt(three[i]);

}

document.write(one.getFullYear() + "年" + one.getMonth() + "月" + one.getDate() + "日" + " " + two[one.getDay()] + "--班级总分为:" + Math.round(sum / 10));

</script>


提问者:慕工程8176175 2019-04-24 11:41

个回答

  • 小胖恩仔
    2019-06-21 17:07:22

    <!DOCTYPE  HTML>
    <html >
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>系好安全带,准备启航</title>

    <script type="text/javascript">

      //通过javascript的日期对象来得到当前的日期,并输出。
     
     var mydate=new Date();
     var weekend=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
     var year=mydate.getFullYear();
     var month=mydate.getMonth();
     var day=mydate.getDay();
     document.write(year+"年"+month+"月"+day+"日"+weekend[mydate.getDay()]+"<br>" )
     
     
     
      //成绩是一长窜的字符串不好处理,找规律后分割放到数组里更好操作哦
      var scoreStr = "小明:87;小花:81;小红:97;小天:76;小张:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76";
     var enen = scoreStr.split(";");

     var sum = 0;
     for(var i=0;i<enen.length;i++){
          var num = enen[i].substring(3);
         sum+=parseInt(num);
     }
     document.write(sum+"<br>");
     


      //从数组中将成绩撮出来,然后求和取整,并输出。
      document.write(Math.floor(sum/enen.length))


    </script>
    </head>
    <body>
    </body>
    </html>

  • angle_juan
    2019-05-16 10:37:27

    <!DOCTYPE  HTML>

    <html >

    <head>

    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

    <title>系好安全带,准备启航</title>


    <script type="text/javascript">


      //通过javascript的日期对象来得到当前的日期,并输出。

      var mydate=new Date();

      var myyear=mydate.getFullYear();

      var mymonth=mydate.getMonth();

      var myday=mydate.getDay();

      var weekday=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];

     

      //成绩是一长窜的字符串不好处理,找规律后分割放到数组里更好操作哦

      var scoreStr = "小明:87;小花:81;小红:97;小天:76;小张:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76";

      var score= scoreStr.split(";");



      //从数组中将成绩撮出来,然后求和取整,并输出。

        var sum=0;

        for(var i=0;i<score.length;i++){

        sum+=parseInt(Math.floor(score[i].substring(3)));

        }

       

        document.write(myyear+"年"+mymonth+"月"+myday+"日"+"&nbsp"+ weekday[mydate.getDay()]+"--班级总分为:"+parseInt(sum/score.length));

    </script>

    </head>

    <body>

    </body>

    </html>


  • 慕侠023444
    2019-04-24 17:17:50

    81是通过floor向下取整得到的,你写的是四舍五入