var arr=scoreStr.split(";");
var sum=0;
for(var i=0;i<arr.length;i++){
var n=arr[i].indexOf(":");
var score=parseInt(arr[i].substr(n+1));
sum=sum+score;
}
avg=Math.round(sum/arr.length);
document.write("總分"+sum);
document.write("平均分"+avg);
