1. <HTML>
  2. <HEAD><TITLE>OnUnLoad事件</TITLE></HEAD> 
  3. <BODY OnUnLoad="alert('感謝您的光臨!!\n歡迎有空常來捧場')"> 
  4. 當你離開本網頁將出現感謝視窗!!
  5. </BODY>
  6. </HTML>