按ctrl時停止功能jQuery

Question

所以我正在做一個小遊戲，你必須按Ctrl來阻止div隨機跳躍。 但是我不能得到它的工作... jumpRandom函數工作正常，直到我把randomJump(){return false;};內if (event.ctrlKey) {}。我該怎麼做才能使它工作？

JS：

$(document).ready(function() { 

function randomFromTo(from, to){ 
      return Math.floor(Math.random() * (to - from + 1) + from); 
} 
$("#goal").bind('mouseenter keypress', function(event) { 
    if (event.ctrlKey) { 
      randomJump(){return false;}; 
     } 
}); 
$('#goal').mouseenter(randomJump); 

function randomJump(){ 
      /* get Window position and size 
      * -- access method : cPos.top and cPos.left*/ 
      var cPos = $('#pageWrap').offset(); 
      var cHeight = $(window).height() - $('header').height() - $('footer').height(); 
      var cWidth = $(window).width(); 

      // get box padding (assume all padding have same value) 
      var pad = parseInt($('#goal').css('padding-top').replace('px', '')); 

      // get movable box size 
      var bHeight = $('#goal').height(); 
      var bWidth = $('#goal').width(); 

      // set maximum position 
      maxY = cPos.top + cHeight - bHeight - pad; 
      maxX = cPos.left + cWidth - bWidth - pad; 

      // set minimum position 
      minY = cPos.top + pad; 
      minX = cPos.left + pad; 

      // set new position   
      newY = randomFromTo(minY, maxY); 
      newX = randomFromTo(minX, maxX); 


      $('#goal').fadeOut(50, function(){ 

       $('#goal').fadeIn(700); 
      }); 
      $('#goal').animate({ 
        left: newX, 
        top: newY, 
        duration: 500 
       }); 
     } 
}); 

Answer 1

試試這個：

$("#goal").bind('mouseenter keypress', function (e) { 
    randomJump(e); 
}); 

function randomJump(e) { 
    if (!e.ctrlKey) { 
     //do normal stuff 
    } else { 
     //depending on how permanent you need this to be... 
     //$("#goal").unbind('mouseenter keypress'); 
    } 
    return !e.ctrlKey; 
}