寫一個HTML頁面，實現以下功能，左鍵點擊頁面時顯示“您好”，右鍵點擊時顯示“禁止右鍵”。並在2秒鐘後自動關閉頁面

<form id="form1">
<iframe style="display:none" name="ifm0">
</form>

<script>
function document.oncontextmenu(){event.returnValue=false;}
function click(){
 if(event.button==2){
   newpage=ifm0.showModelessDialog("javascript:alert('您好，現在點擊了右鍵');window.close();","","status:no;resizable:no;help:no;dialogHeight:30px;dialogWidth:40px;");
setTimeout("ifm0.location.reload();",2000);
  }
  if(event.button==1){
   newpage=ifm0.showModelessDialog("javascript:alert('您好，您點擊了左鍵');","","status:no;resizable:no;help:no;dialogHeight:30px; dialogWidth:40px;");
setTimeout("ifm0.location.reload()",2000);
}

}
document.onmousedown=click;
</script>