Poor man's shift+reload detection

detectshiftreload.js

var toggle = false,
    keyHandler = function(event) {
      
        toggle = event.shiftKey;
    },
    unloadHandler = function() {
      
        if(toggle) {
        
            // Do stuff here..
            alert('Shift reload!');
        }
    };

if('addEventListener' in document) {
  
    document.addEventListener('keydown', keyHandler, true);
    document.addEventListener('keyup', keyHandler, true);
    window.addEventListener('unload', unloadHandler, true);
} else {
  
    document.attachEvent('onkeydown', keyHandler);
    document.attachEvent('onkeyup', keyHandler);
    window.attachEvent('onunload', unloadHandler);
}