key-codes.js

这是《JavaScript学习源代码》一书的源代码

// specify a KEYDOWN event-handler

window.document.onkeydown=showkey;

// a function to react to the KEYDOWN event

// passing the KeyboardEvent object as its argument

function showkey(e)

{
 
  var obj = (navigator.appName == "Microsoft Internet Explorer")
  ? event : e ; 

  // consider the keyCode property value
  
  if(obj.keyCode == 89 || obj.keyCode == 121) 
alert("Y pressed");
  if(obj.keyCode == 78 || obj.keyCode == 110) 
alert("N pressed");
}