var date=new Date();
  var w=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
  document.write(date.getFullYear()+"年"+date.getMonth()+"月"+date.getDate()+"日&nbsp;"+w[date.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 sorceStr = "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 s=sorceStr.split(";");
    var t = 0;
  for(var i=0;i<s.length;i++)
  {
      
      t = parseInt(s[i].split(":")[1]) + t;
      
  }
    document.write(parseInt(t/s.length));