JavaScript使用addEventListener添加事件监听用法实例

<!DOCTYPE html>
<html lang="en">
<head>
 <title>This text is the title of the document</title>
 <script>
  function showalert(){
   alert('you clicked me!');
  }
  function clickme(){
   var pelement=document.getElementsByTagName('p')[0];
   pelement.addEventListener('click', showalert, false);
  }
  window.addEventListener('load', clickme, false);
 </script>
</head>
<body>
 <div id="main">
  <p>Click Me</p>
  <p>You Can't Click Me</p>
 </div>
</body>
</html>