Can this for loop in JavaScript be altered to repeat the prompt questions if they are not filled in? -

i have completed code challenge , have been trying see if can altered repeat prompt questions, if not filled in user? able using while loop , wondering if possible in loop. have played around conditional statements, beginner , have had no luck far. if able let me know if possible , explain how, appreciated.

// loop code challenge   //write varibales needed  var quote; var author; var authorandquote;  // variables = to?  need length property for loop function know  var quote =  prompt("please write known quote below?"); var author = prompt("please write author quote below?"); var authorandquote = 'quote' + 'author';  for(var = 0; < authorandquote.length; += 1){  }  // print console  console.log("your quote " + quote + " author " + author + ".");     // while loop code challenge   //write varibales needed var quote; var author;   //use ! in while loop state while not true keep prompting question  while (!quote) {   quote = prompt("please write known quote below?"); }  while (!author) {   author = prompt("please write author quote below?"); }    //print answer console  console.log("your quote " + quote + " author " + author + ".");