执行while循环无法使用提示。 Java脚本

Question

I'm using JS Bin website to write this.

the loop fires only once when I give a bad (numeric) input :

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

Move the the var inoutOK = true into the loop that way it resets before prompting again.

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);


      ....
    }