其他結果不會顯示在while循環中 - javascript

Question

我有一個while循環，其中有if，else if和else條件。當我運行循環時，最後的else條件永遠不會顯示，我試圖找出它的原因。下面的代碼：

var loopEnd = 1; 
while (loopEnd != 2) { 
    var conversion = prompt("Do you want to convert miles to km, or km to miles?"); 
    if (conversion == "miles to km") { 

    var miles = 0; 
    var miles = prompt("How many miles do you want to convert?"); 
    var kilometers = 1.61 * miles; 
    while (miles != 0) { 
     alert("The number of kilometers for " + miles + " miles is " + kilometers + " kilometers."); 
     var miles = prompt("How many miles do you want to convert?"); 
     var kilometers = 1.61 * miles; 
        } 
    var promptEnd = prompt("Do you want to convert anything else?"); 
    if (promptEnd == "no") { 
     var loopEnd = 2; 
     } else { 
     alert("Okay, let's convert something else!"); 
     } 

    } else if (conversion == "km to miles") { 

    var kilometers = 0; 
    var kilometers = prompt("How many kilometers do you want to convert?"); 
    var miles = 0.62 * kilometers; 
    while (kilometers != 0) { 
     alert("The number of miles for " + kilometers + " kilometers " + miles + " miles."); 
     var kilometers = prompt("How many kilometers do you want to convert?"); 
     var miles = 1.61 * kilometers; 
    } 
    var promptEnd = prompt("Do you want to convert anything else?"); 
    if (promptEnd == "no") { 
     var loopEnd = 2; 

// } else { 

    alert("Sorry, I didn't quite catch that."); 
    } 
    } 
} 

Answer 1

如果你是指的在else與它的警報，那麼你需要重新格式化你的代碼。這裏試試這個

var loopEnd = 1; 
while (loopEnd != 2) { 
    var conversion = prompt("Do you want to convert miles to km, or km to miles?"); 
    if (conversion == "miles to km") { 

    var miles = 0; 
    var miles = prompt("How many miles do you want to convert?"); 
    var kilometers = 1.61 * miles; 
    while (miles != 0) { 
     alert("The number of kilometers for " + miles + " miles is " + kilometers + " kilometers."); 
     var miles = prompt("How many miles do you want to convert?"); 
     var kilometers = 1.61 * miles; 
    } 
    var promptEnd = prompt("Do you want to convert anything else?"); 
    if (promptEnd == "no") { 
     var loopEnd = 2; 
    } else { 
     alert("Okay, let's convert something else!"); 
    } 


} else if (conversion == "km to miles") { 

    var kilometers = 0; 
    var kilometers = prompt("How many kilometers do you want to convert?"); 
    var miles = 0.62 * kilometers; 
    while (kilometers != 0) { 
     alert("The number of miles for " + kilometers + " kilometers " + miles + " miles."); 
     var kilometers = prompt("How many kilometers do you want to convert?"); 
     var miles = 1.61 * kilometers; 
    } 
    var promptEnd = prompt("Do you want to convert anything else?"); 
    if (promptEnd == "no") { 
     var loopEnd = 2; 
    } 
} 
else { 
    alert("Sorry, I didn't quite catch that."); 
} 
} 

Rhumborl是正確的，你需要清理你的代碼，並給它適當的間距。