Javascript 分数计算与平均

这是我的HTML代码，出于某种原因，这段代码只接受三个值，不超过三个值，当我尝试输入更多值时，它只显示我输入的前三个值。我的代码有点问题，但我想不出来。请帮忙

var gradeCounter, gradeValue, total, average, grade;

total = 2;
gradeCounter = 0;
grade = prompt("enter grade, -1 to Quit:", "0");
gradeValue = parseInt(grade);

while (gradeValue != -1 && gradeValue > 65) document.write("<br>" + gradeValue + " pass</br>");
  total = total + gradeValue;
  gradeCounter = gradeCounter + 1;
  grade = prompt("enter grade, -1 to Quit:", "0");
  gradeValue = parseInt(grade);
}

if (gradeCounter != 0 && gradeValue <= 65) {
    document.write("<br>" + gradeValue + " fail</br>");

    total = total + gradeValue;
    gradeCounter = gradeCounter + 1;
    grade = prompt("enter grade, -1 to Quit:", "0");
    gradeValue = parseInt(grade);
    average = total / gradeCounter;

    document.write("<br>total grade: " + gradeCounter + "</bt>");
    document.write("<br>average passing grade:" + average + "</br>");
} 
else document.write("total grade:" + 0);

var等级计数器、等级值、总计、平均值、等级；
总数=2；
等级计数器=0；
等级=提示（“输入等级-1以退出：”，“0”）；
gradeValue=parseInt（等级）；
while（gradeValue！=-1&&gradeValue>65）文档。写入（“
”+gradeValue+”pass
”；
合计=合计+评分值；
成绩计数器=成绩计数器+1；
等级=提示（“输入等级-1以退出：”，“0”）；
gradeValue=parseInt（等级）；
}
如果（gradeCounter！=0&&gradeValue您不需要那么多代码

我已经更新了你的代码，应该可以用了。看看吧

JsFiddle：

var-gradeCounter=0，gradeValue=0，total=0，average，grade；
//环路
虽然（gradeValue！=-1&&gradeValue欢迎使用；请查看。此外，阅读以了解如何充分发挥降价的潜力。如果你向人们展示你花时间问了一个像样的、写得很好的问题，他们会花时间回答。对于大于65分的分数，似乎应该无限循环：
（gradeValue！=-1&&gradeValue>65）文档。写入（“
”+gradeValue+”pass
”）；
我有点后悔花时间读这篇文章。我修改了你代码的格式，但注意到在
if
语句之前有一个额外的
}
语句。我建议把你的代码放入并修改那些警告。是的，我是盲目的。我删除了所有内容，但遗憾仍然存在。
var gradeCounter =0, gradeValue = 0, total = 0, average, grade;

//Loop
while (gradeValue != -1 && gradeValue <= 65) {

    //Prompt the user
    grade = prompt("enter grade, -1 to Quit:", "0");
    //Parse the prompt result to a int
    gradeValue = parseInt(grade);

    //Check if gradeValue is smaller than 0
    if(gradeValue < 0){
        //If it is, then we can finish adding grade
        document.write("<br>Finish adding grades");
    } else{
       //Add gradeValue to total score
       total += gradeValue;
       //Increment the number of grades by 1
       gradeCounter += 1;
       //Output to the user
       document.write("<br>" + gradeValue + " pass</br>");
   }
}

//Calculation
total = total + gradeValue;
average = total / gradeCounter;

//Output
document.write("<br>total grade: " + gradeCounter + "</bt>");
document.write("<br>average passing grade:" + average + "</br>");​