js屏蔽
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 ">
<noscript> <meta http-equiv= "refresh " content= "0;url=about:noscript ">
</noscript> <title> 屏蔽鼠标右键、Ctrl+n、shift+F10、F5刷新、退格键 </title>
</head>
<body onkeydown= "KeyDown() "
oncontextmenu= "event.returnValue=false ">
<script language= "Javascript "> <!--
//屏蔽鼠标右键、Ctrl+n、shift+F10、F5刷新、退格键
//Author: meizz(梅花雨) 2002-6-18
function KeyDown(){
if ((window.event.altKey)&&
((window.event.keyCode==37)|| //屏蔽 Alt+ 方向键 ←
(window.event.keyCode==39))){ //屏蔽 Alt+ 方向键 →
alert( "不准你使用ALT+方向键前进或后退网页! ");
event.returnValue=false;
}
/* 注:这还不是真正地屏蔽 Alt+ 方向键,
因为 Alt+ 方向键弹出警告框时,按住 Alt 键不放,
用鼠标点掉警告框,这种屏蔽方法就失效了。以后若
有哪位高手有真正屏蔽 Alt 键的方法,请告知。*/
if ((event.keyCode==8) || //屏蔽退格删除键
(event.keyCode==116)|| //屏蔽 F5 刷新键
(event.ctrlKey && event.keyCode==82)){ //Ctrl + R
event.keyCode=0;
event.returnValue=false;
}
if ((event.ctrlKey)&&(event.keyCode==78)) //屏蔽 Ctrl+n
event.returnValue=false;
if ((event.shiftKey)&&(event.keyCode==121)) //屏蔽 shift+F10
event.returnValue=false;
if (window.event.srcElement.tagName == "A " && window.event.shiftKey)
window.event.returnValue = false; //屏蔽 shift 加鼠标左键新开一网页
if ((window.event.altKey)&&(window.event.keyCode==115)){ //屏蔽Alt+F4
wi