捕捉按键、隐藏按钮、鼠标建、获取Session

<script type="text/javascript" language="javascript">
   debugger;//调试js

var username = '<%=Session["username"] %>';
 //alert(username);
 if (username == ""){
  //location.replace("login.aspx");//禁止后退
  window.navigate("login.aspx");//禁止后退

 
  }
 
 document.body.onkeydown =  function(){
  var keyCode = event.keyCode;
  var charCode = String.fromCharCode(key);
  alert(charCode);
 
  }

 var i = 0;
document.body.onmousedown = function (){
if (event.button==2){
 
  //alert("right key is beaten！");
  document.getElementById("infoDiv").innerHTML = "left key is stopped！" + (i++);
  event.returnValue = false;
 return true;
 
 }

}

function hide(obj){
obj.style.visibility="hidden";
}

 

    </script>