來自document.write和變量未定義的不平衡樹

Question

我正在編寫一個程序來顯示總測試等級和avg循環。然而，當我嘗試測試它時，我無法獲得最終消息「Good Job」顯示，並且出現不平衡樹和未定義的「Avg」變量的錯誤。我不明白怎麼「平均」是不確定的，當它經過

var Testscore = 0; 
 
var Testcount = 0; 
 
var Total = 0; 
 
var Avg = 0; 
 
do { 
 
    Testscore = prompt("Enter the test score ", 0); 
 
    Testcount = (Testcount + 1); 
 
    Total = parseFloat(Testscore) + parseFloat(Total); 
 
    Avg = (Total/Testcount); 
 
    document.write("Total test score is " + Total + "<br>"); 
 
    document.write("Average test score is " + Avg + "<br>" + "<br>"); 
 
} while (Testcount < 4) 
 
Avg = (Total/Testcount); 
 
if (avg > 80) { 
 
    document.write("Good Job!"); 
 
} else { 
 
    documet.write("Try harder.."); 
 
}

Answer 1

你剛剛在你的代碼的一些錯別字在循環過程的工作只是不！

avg和Avg是不同的，因爲變量是case sensitive。

此外，還有的documet代替document

var Testscore = 0; 
 
var Testcount = 0; 
 
var Total = 0; 
 
var Avg = 0; 
 
do 
 
    { 
 
    Testscore = prompt("Enter the test score ",0); 
 
    Testcount = (Testcount + 1); 
 
    Total = parseFloat(Testscore) + parseFloat(Total); 
 
    Avg = (Total/Testcount); 
 
    document.write("Total test score is " + Total + "<br>"); 
 
    document.write("Average test score is " + Avg + "<br>" + "<br>"); 
 
    } while (Testcount < 4) 
 
    Avg = (Total/Testcount); 
 
    if (Avg > 80) 
 
     { 
 
      console.log("Good Job!"); 
 
     } 
 
     else 
 
     { 
 
      console.log("Try harder.."); 
 
     }