JavaScript不計算重複正確

Question

我寫了一個javascript，要求用戶輸入5個數字，並檢查最大和最小的數字。我可以讓它顯示最大和最小的數字。主要的問題是，當用戶輸入最多或最多的數字時，我需要顯示一條錯誤消息。當我在前兩個框中輸入兩個大數字時，出現錯誤消息，但如果輸入兩個小數字，則不會收到錯誤消息。這是我的代碼，我懷疑它是我的，但我不完全確定。

編輯：對不起，我忘了提及我只限於使用if-else語句。沒有循環，沒有數組。都不是。我知道，我知道，這絕對是可怕的。

function testProgram() { 

var largestNum, smallestNum; 
var num1, num2, num3, num4, num5; 
var smallDupe, largeDupe; 

var num1 = document.getElementById("Num1").value; 
var num2 = document.getElementById("Num2").value; 
var num3 = document.getElementById("Num3").value; 
var num4 = document.getElementById("Num4").value; 
var num5 = document.getElementById("Num5").value; 

num1 = parseFloat(num1); 
num2 = parseFloat(num2); 
num3 = parseFloat(num3); 
num4 = parseFloat(num4); 
num5 = parseFloat(num5); 

if ((!isNaN(num1)) && (!isNaN(num2)) && (!isNaN(num3)) && (!isNaN(num4)) && (!isNaN(num5))) { 

    largestNum = num1; 
    smallestNum = num1; 
    smallDupe = 0; 
    largeDupe = 0; 

    if(num2 >= largestNum) { 
     if(num2 == largestNum) { 
      largeDupe++; 
     } 
     else if (num2 <= smallestNum) { 
      if(num2 == smallestNum) { 
       smallDupe++; 
      } 
       smallestNum = num2; 
       smallDupe = 0; 
     } else { 
       largestNum = num2; 
       largeDupe = 0; 
     } 
    } 
    if(num3 >= largestNum) { 
     if(num3 == largestNum) { 
      largeDupe++; 
     } 
     else if (num3 <= smallestNum) { 
      if(num3 == smallestNum) { 
       smallDupe++; 
      } 
      smallestNum = num3; 
      smallDupe = 0; 
     } else { 
      largestNum = num3; 
      largeDupe = 0; 
     } 
    } 
    if(num4 >= largestNum) { 
     if(num4 == largestNum) { 
      largeDupe++; 
     } 
     else if (num4 <= smallestNum) { 
      if(num4 == smallestNum) { 
       smallDupe++; 
      } 
      smallestNum = num4; 
      smallDupe = 0; 
     } else { 
      largestNum = num4; 
      largeDupe = 0; 
     } 
    } 
    if(num5 >= largestNum) { 
     if(num5 == largestNum) { 
      largeDupe++; 
     } 
     else if (num5 <= smallestNum) { 
      if(num5 == smallestNum) { 
       smallDupe++; 
      } 
      smallestNum = num5; 
      smallDupe = 0; 
     } else { 
      largestNum = num5; 
      largeDupe = 0; 
     } 
    } 

    if (smallDupe > 0 || largeDupe > 0) { 

     // Display an error to the user stating that there are duplicates 
     window.alert("The smallest number and/or largest number contains is duplicated."); 
     console.log("Error notice"); 
    } 

    // Reference out1 and out2 to the HTML document 
    var out1 = document.getElementById("Out1"); 
    var out2 = document.getElementById("Out2"); 
    out1.disabled = false; 
    out1.value = largestNum; 
    out2.disabled = false; 
    out2.value = smallestNum; 

    } else { 

     // Tells the user that their input is invalid and to input five numbers again 
     window.alert("Please input five numbers"); 
     console.log("Error notice"); 

    } 
} 

Answer 1

你增加smallDupe後，你將它設置回0您需要處理當前的數量從它等於比最小的分別少的情況。另外，如果您在第一個框中輸入相同的數字，它將是最大和最小的複製品，並且您需要允許這個;最簡單的方法是使用兩個獨立的組if/else if，而不是將它們全部組合成一個大聲明。

if(num2 > largestNum) { 
    largestNum = num2; 
    largeDupe = 0; 
} else if (num2 == largestNum) { 
    largeDupe++; 
} 

if (num2 < smallestNum) { 
    smallestNum = num2; 
    smallDupe = 0; 
} else if (num2 == smallestNum) { 
    smallDupe++; 
}