<script type="text/javascript">

    var myDate=new Date();

    var myDdy=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"] ;

  document.write("今天是：" + weekDay[myDdy] + "<br/>" ); 

  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 scorArr = scoreStr.split(";");

  var sumscore = 0;

  for(var i=0;i<scorArr.length;i++){ 

        sumscore+=(parseInt(scorArr[i].split(":")[1])) 

    }

    document.write(scorArr + "<br/>")

  document.write(sumscore + "<br/>")

  document.write(myDate.getFullYear() + "年" + myDate.getMonth() + "月" + myDate.getDate() + "日" + weekDay[myDdy] + "班级总分：" + sumscore + "平均分：" + sumscore/scorArr.length)

   </script>