做while循環時不提示。 Javascript

Question

我正在使用JS Bin網站來寫這個。

循環火災只有當我給個差（數字）輸入一次：

function isInputLeapYear() 
{ 
    var year = -1; 

    var inputOk = true; 

    do{ 
     year = prompt("Please enter a year to check if it is a leap year \ninput year between 0-9999"); 

     if(year < 0 || 9999 < year) // check input 
     { 
     inputOk = false; 
     alert("\""+year+"\" is not a good year. \nThe input needs to be between 0-9999");    
     }; 


    }while(inputOk === false); 


    .... 
} 

Answer 1

移動了var inoutOK = true進入死循環再次提示之前復位的方式。

function isInputLeapYear() 
{ 
    var year = -1; 

    do { 
     var inputOk = true; 
     year = prompt("Please enter a year to check if it is a leap year \ninput year between 0-9999"); 

     if(year < 0 || 9999 < year) // check input 
     { 
      inputOk = false; 
      alert("\""+year+"\" is not a good year. \nThe input needs to be between 0-9999");    
     }; 


    } while(inputOk === false); 


    .... 
} 

Answer 2

function isInputLeapYear() 
    { 
     var year = -1; 

     var inputOk = false; 

     do{ 
      year = prompt("Please enter a year to check if it is a leap year \ninput year between 0-9999"); 

      if(year > 0 && 9999 > year) // check input 
      { 
      inputOk = True; 



      else 
{ 
alert("\""+year+"\" is not a good year. \nThe input needs to be between 0-9999"); 
} 
      }; 


     }while(inputOk === false); 


     .... 
    }